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| 1 | Role of multi-microalloying by rare earth elements in ductilization of magnesium alloys显示文摘The present work investigates the influences of microalloying with rare earths on the mechanical properties of magnesium alloys.The amount of each rare earth element is controlled below 0.4 wt.%in order not to increase the cost of alloy largely.The synergic effects from the multi-microalloying with rare earths on the mechanical properties are explored.The obtained results show that the as-cast magnesium alloys multi-microalloying with rare earths possesses a quite high ductility with a tensile strain up to 25-30%at room temperature.Moreover,these alloys exhibit much better corrosion resistance than AZ31 alloy.The preliminary in situ neutron diffractions on the deformation of these alloys indicate that the multi-microalloying with rare earths seems to be beneficial for the activation of more slip systems.The deformation becomes more homogeneous and the resultant textures after deformation are weakened. | Yuanding Huang Weimin Gan Karl Ulrich Kainer Norbert Hort | 2014 | Journal of Magnesium and Alloys2014，2，1： | 19 |
| 2 | INVESTIGATION OF LOW CYCLE FATIGUE BEHAVIOROF BUILDING STRUCTURAL STEELS UNDEREARTHQUAKE LOADING显示文摘Based on the failure model of building structural steels under earthquake loading, the low cycle fatigue test at constant strain, the stochastical fatigue test under real earthquake load spectrum and the structural fatigue test are carried out. The experimental results show that microalloying of V Ti and Nb can improve the anti-seismic propersties of steel bars. In the high strain and shori life range, both the static strength and ductility of steels are very important to increasing the low cycle fatigue resistance of steels. | G.M Sheng and S.H Gong(Department of Metallurgy and Materials Engineering, Chongqing University Chongqing 630044, China) | 1997 | Acta Metallurgica Sinica(English Letters)1997，10，1： | 17 |
| 3 | Microstructures and mechanical properties of the age hardened Mg-4.2Y-2.5Nd-1Gd-0.6Zr(WE43)microalloyed with Zn显示文摘The effect of trace addition of 0.2 wt.%Zn on the microstructures and mechanical properties of the age-hardening Mg-4.2Y-2.5Nd-1Gd-0.6Zr(wt.%)(WE43)alloy has been investigated.As compared with the WE43 alloy after solid solution treatment at 525 ℃,the block-like Zn-Zr phase was still observed in the WE43-0.2Zn alloy.However,the time for WE43-0.2Zn alloy to get peak hardness at 250 ℃ was two hours,a half earlier than that in WE43 alloy,meaning a accelerated age precipitation kinetics has been achieved due to the addition of 0.2 wt.%Zn.Microalloyed with 0.2 wt.%Zn enhanced the ultimate tensile strength(UTS)slightly and ductility significantly both in the solutionized and peak aged condition.The enhancement in strength and ductility is possible associated with the larger volume fraction of precipitation phases due to a reduction of the solubility of rare earth elements(RE)in theα-Mg matrix,the larger aspect ratio(length to width)of precipitates and a decrease in stacking fault energy by addition of Zn. | Y.H.Kang D.Wu R.S.Chen E.H.Han | 2014 | Journal of Magnesium and Alloys2014，2，2： | 16 |
| 4 | Tailoring the microstructural characteristic and improving the corrosion resistance of extruded dilute Mg-0.5Bi-0.5Sn alloy by microalloying with Mn显示文摘Mg-0.5Bi-0.5Sn alloys with and without microalloying with 0.5 wt%Mn were subjected to extrusion,and the effect of Mn microalloying on the microstructural characteristic and corrosion behavior of the extruded alloys was investigated.The results indicated that the average grain size and the density of dislocations decreased,and a new Mg_(26.67)Mn_(65.47)Fe_(7.86)second phase as well as grain boundary segregation of Sn atoms could be observed in certain micro-regions of the extruded dilute Mg-0.5Bi-0.5Sn-0.5 Mn alloy.The tailoring of microstructure resulted in the significant enhancement in corrosion resistance(R_(p)increased from 1095.91Ωcm^(2)to 5008.79Ωcm^(2)).In addition,grain boundary segregation resulted in intergranular corrosion and led to the dissolution of Sn atoms.Hence,the dissolution rate of the matrix in Mg-0.5Bi-0.5Sn-0.5Mn alloy could be inhibited by the corrosion product film containing an intermediate product(SnO_(2)). | Yang Liu Wei-li Cheng Xiong-jie Gu Yan-hui Liu Zeqin Cui Lifei Wang Hong-xia Wang | 2021 | Journal of Magnesium and Alloys2021，9，5： | 5 |
| 5 | The State-of-Art and Development Trends of HSLA Steels in China显示文摘During the last decade,the adjustment of product segments always is a very important task of iron industry,and upgrading of steel products has been impelled actively by Chinese iron and steel industry.With rapidly increasing of iron & steel production,a series of research achievements have been made in the technology area of high strengthtoughness steel,and also have been applied successfully in the actual production,e.g.the technology of fine grain and ultra-fine grain steels,the technology for the control of microalloying precipitates.Further,It is an important strategic goal of 'Twelfth Five-year Plan' for Chinese iron and steel industry that the adjustment of steel product segments and meeting the requirements for upgrading of domestic and oversea equipment manufactory industry.Adopting HSLA steel with better performance,instead of plain steel,could save steel consumption largely,and also release pressures from resource,energy and environment.Without doubt,it is the only way to realize the sustained development of Chinese iron and steel industry by popularizing the application of HSLA steels vigorously. | WENG Yu-qing 1,YANG Cai-fu 2,SHANG Cheng-jia 3 (1.The Chinese Society for Metals,Beijing,PR China 2.Centre Iron and Steel Research Institute,Beijing,PR China 3.University of Science and Technology Beijing,Beijing,PR China) | 2011 | Journal of Iron and Steel Research(International)2011，18，S1： | 5 |
| 6 | Behavior of Rare Earthsin UltraLowSulfur Microalloyed Steel显示文摘The investigation on the behavior of RE in microalloyed steel containing Nb and Ti indicates RE still have the effect of purifying molten steel and metamorphose inclusions even when the composition of S is pretty low(S<0 003%). The optimum performance of the experimental steels can be obtained when w RE / w O+S is controlled around 3 9. The content of solid solution RE can reach 1×10 -5 ~1×10 -4 order of magnitude in ultra low sulfur steel. The additions of RE can reduce the segregation of S and P at the grain boundary, delay the dynamic recrystallization, refine the grain and second phase particles, and promote the precipitation of (Nb, Ti)(C, N). RE also exhibit the microalloying effect in steel. | 刘勇华 林勤 叶文 陈宁 郭英 陈祝清 祝庆和 | 1999 | Journal of Rare Earths1999，17，3： | 4 |
| 7 | WROUGHT TiAl ALLOY DESIGN显示文摘Empirical improvements made in cast alloys have led to gamma alloys which are a viable materials technology, and to the development of various applications for gas turbine engines, as well as automotive engines. For wrougth alloys, over the last seven years the author et al have made extensive efforts to remove their deficiencies, and to achieve an improved balance of properties, across three interrelated task areas. The first effort was directed toward understanding fundamentals, such as phase relations, microstructure evolution, and microstructure property relationships. The second task was then directed to improve the balance of properties through designing refined lamellar microstructures and microalloying. The third effort was to explore the production methods to develop desired microstructures and to optimize the alloy compositions. This paper discusses the progress made from the last two efforts. | Young Won Kim Materials and Manufacturing Directorate, Air Force Research Laboratory Wright Patterson AFB, OH 45433, U. S. A. | 1999 | 中国有色金属学会会刊:英文版1999，9，S1： | 3 |
| 8 | Development of Low Carbon Microalloyed High Strength Ultra-Thin Cast Strip Products Produced by the Castrip~ Process With Excellent Strength-Ductility Properties显示文摘The CASTRIP* process produces a range of high strength Ultra-thin Cast Strip (UCS) products (380-550 MPa) in thicknesses between 0.9 mm and 1.5 mm, which is very challenging to produce via conventional hot and cold rolled processing routes. The twin roll CASTRIP process fully exploits the hardenability and strengthening potential of Nb in a low C-Mn-Nb-V microalloyed steel type. Significant microstructural strengthening from solute Nb was obtained, even at low microalloying levels, as well as modest Mn additions, through enhancing the hardenability and further strengthening was obtained in coated products by exploiting age hardening during processing on a continuous hot dip galvanising line. Atom probe tomography and TEM determined that Nb was retained in solid solution and subsequent age hardening resulted from the formation of Nb and V rich nanosized particles. Age hardening was achieved without loss of ductility producing galvanised strip with an excellent strength-ductility combination (Y.S. >600 MPa, T.E. >10%). | C.R. Killmore K.R. Carpenter H.R. Kaul D.G. Edelman J.M. Cairney S.P. Ringer J.G. Williams P.C. Campbell W.N. Blejde | 2011 | Journal of Iron and Steel Research(International)2011，18，S1： | 3 |
| 9 | Study on Microstructure Refinement of Vanadium and Nitrogen Microalloyed Low Carbon Bainitic Steel显示文摘The effect of relaxation treatment after finish rolling on microstructure and mechanical properties has been investigated for a vanadium and nitrogen microalloyed low carbon bainitic steel.Finer lath bainite microstructure can be obtained in the plate with relaxation.The results of quantitative statistics show that in the plate without relaxation,80% of the total bainite lath bundles are in the range 5-15μm in length and 3-13μm in width,while in the plate with relaxation 80% of the total bundles are in the range 3-9μm in length and 1-7μm in width.The mechanical properties show that the plate with relaxation has higher impact energy,yield strength and hardness than the plate without relaxation,also the comprehensive performance after tempered at 650℃ is superior to the plate without relaxation. | GAO Fei 1,2,WANG Rui-zhen 1,QIAN Tian-cai 2 (1.China Central Iron and Steel Research Institute,Beijing 100081,China 2.Kunming University of Science and Technology,Kunming 650093,Yunnan,China) | 2011 | Journal of Iron and Steel Research(International)2011，18，S1： | 2 |
| 10 | Effect of Microalloying Additions on the Microstructure and Mechanical Properties of Low Carbon Steel显示文摘Low carbon steels are characterized by good weldability,formability and fracture toughness properties.However,the low strength levels of these steel grades limit their wide applications.On the other hand,increasing the strength by increasing the carbon content and alloying elements deteriorates the other properties.In this study,the microalloying technique was used to examine the possibility of attaining low carbon steels with good combination of strength,ductility and impact properties.A low carbon steel microalloyed with single addition of vanadium and another one microalloyed with combined addition of vanadium and titanium were used in this investigation and their properties were compared with non-microalloyed low carbon steel having the same base composition.Furthermore,other two nonmicroalloyed and V-microalloyed steels with higher carbon,silicon and manganese contents were also investigated to reveal the effect of base composition.Tensile,hardness,room and zero temperature Charpy V-notch impact tests were conducted to evaluate the variations in the mechanical properties of low carbon hot forged steel containing vanadium and combinations of vanadium and titanium.In addition,the microstructures of the different investigated steels were observed using both optical microscope and scanning electron microscope.Furthermore,the hardness of the ferrite phase was also determined using micro-hardness technique.The results showed improvement of the mechanical properties of the investigated steels by both single V-and combined V + Ti-microadditions.Tensile,hardness and impact tests results indicated that good combinations of strength,ductility and impact properties can be achieved by V-microalloying addition.Steel with combination of V and Ti microaddition has much higher hardness,yield strength,ultimate tensile strength and impact energy at both room and zero temperatures compared with non-microalloyed and single Vmicroalloyed steels.Higher C,Si and Mn contents result in increasing the strength accompanied with decreasing the impact energy.Scanning electron microscopy and optical microscopy studies revealed grain refinement effect of both Vand V+Ti-microadditions.The micro-hardness measurements of the ferrite phase confirmed the precipitation strengthening effect of microalloying elements. | EISSA Mamdouh ABD El-Aziz Ahmed GHALI Saeed HALFA Hossam SABER Shady | 2011 | Journal of Iron and Steel Research(International)2011，18，S1： | 2 |
| 11 | Structure-property relationships in heat-affected zone of gas-shielded arc-welded V-N microalloyed steel显示文摘The structure-property relationship in heat-affected zone (HAZ)of a low-carbon steel bearing V-N subjected to gasshielded arc welding was explored.The microstructural characteristics of base metal (BM),coarse-grained HAZ (CGHAZ),fine-grained HAZ,and intercritical HAZ were significantly different.The effect of grain-refinement strengthening and transformation hardening on HAZ contributed to equivalent hardness of 260.8-278.5 HV in comparison with BM hardness of 272.0 HV.Moreover,excellent impact toughness at -20 ℃ was obtained because of high resistance to crack propagation by high-misorientation boundaries,leading to impact fracture consisting of dimples.In CGHAZ,free N was partly fixed by V(C,N)precipitates,such that the deterioration effect of N on toughness was considered to be nearly eliminated.In comparison with CGHAZ,weld metal contained higher fraction of acicular ferrite with fine plates,while the impact toughness was inferior because of the detrimental influence of coarse inclusions from the welding wire.The nanoscale V(C,N)precipitates in CGHAZ had weak effect on toughness because of small size. | Jun Hu Lin-xiu Du Bin Zhang Xiang-yu Qi Xiu-hua Gao R.D.K.Misra | 2018 | Journal of Iron and Steel Research(International)2018，25，12： | 1 |
| 12 | XRD STUDY OF RECOVERY PROCESS OF COLD DEFORMED Ag AND Ag-Ce ALLOY显示文摘XRDSTUDYOFRECOVERYPROCESSOFCOLDDEFORMEDAgANDAg-CeALLOYNINGYuantao;WENFei(KunmingInstituteofPreciousMetalsKunming650221.China)... | NING Yuantao WENFei(Kunming Institute of Precious Metals Kunming 650221.China) | 1996 | Acta Metallurgica Sinica(English Letters)1996，9，1： | 1 |
| 13 | In situ observation and modeling of austenite grain growth in a Nb-Ti-bearing high carbon steel显示文摘In situ measurements of austenite grain growth were made at various temperatures in the range of 1273-1473 K with subsequent isothermal holding time of 3600 s for the Nb-Ti-bearing and Nb-Ti-free high carb on steel by using a confocal laser scanning microscope.The solid solute behavior of Nb-Ti carbides during austenitizing process was analyzed.The experimental results indicate that the austenite grains of both steels grow up gradually with increasing the heating temperature and holding time;the size and growth rate of austenite grain of Nb-Ti-bearing high carbon steel are much lower than those of Nb-Ti-free high carbon steel.A large amount of(Nb,Ti)(C,N)nanoparticles are observed in Nb-Tibearing steel,which retain the strong pinning effect on austenite grain boundary.The kinetics model of austenite grain growth of Nb-Ti-bearing steel during isothermal heat treatment is obtained and the predicted values calculated by using the model meet the experimental values very well. | Guang Ji Xiu-hua Gao Zhen-guang Liu Ke Zhang | 2019 | Journal of Iron and Steel Research(International)2019，26，3： | 1 |
| 14 | STRUCTURE CHARACTERISTICS OF MICROALLOYING AS-CAST MARTENSITIC CAST IRON显示文摘The microstructure and martensite substructure of as-cast martensitic high-Cr cast iron byinjection microalloying have been studied by usig SEM and TEM.The relationship betweendistribution of alloying elements and phase formation of carbide,as well as various branchingand distortion of carbide,have been analysed by X-ray diffractometer and EPMA. | ZHANG Jinghui LI Dajun ZHAO Jiuzhou JIA Jun Harbin Institute of Technology,Harbin,ChinaLI Jianhui Heilongjiang Association for Science and Technology,Harbin,China | 1991 | Acta Metallurgica Sinica(English Letters)1991，4，9： | 1 |
| 15 | Effects of density difference of constituent elements on glass formation in TiCu-based bulk metallic glasses显示文摘Glass formation is generally favored by a large atomic size mismatch among constituent elements,which usually leads to large density differences among them as well.During melting,elemental segregation occurs due to Stokes' law and then inevitably affects glass formation.In this paper,such effects on glass-forming ability in a TiCu-based alloy system have been demonstrated.In the bulk glassforming composition Ti43Cu42Hf14Si1,macroscopic segregation of Si was observed in the as-melted ingots and silicon was completely depleted in the as-cast rods.In another Ti33Cu47Ni8Zr11Si1 alloy,nevertheless,the effects of density differences among the constituent elements were less severe.It was also confrmed that using proper pre-alloys could be an effective way in alleviating the side effects of the elemental segregation. | Zhongyan Zhang Zengbao Jiao Jie Zhou Yuan Wu Hui Wang Xiongjun Liu Zhaoping Lu | 2013 | Progress in Natural Science:Materials International2013，23，5： | 1 |
| 16 | Effect of Nb-V Microalloying on Microstructures and Mechanical Properties of Medium Carbon Non-Quenched and Tempered Steel显示文摘Based on optical microscope(OM),transmission electron microscope(TEM) and mechanical performance measurement,the microstructures and mechanical properties of Nb-V micro-alloying non-quenched and tempered steels have been studied.The results showed that the microstructure consists of ferrite and pearlite,in which there exists a lot of intragranular ferrite.Niobium carbide is the main form of carbonitrides,Nb-enriched carbonitrides refine grains,V-enriched carbonitrides have precipitation strengthening effect,which promotes the toughness of the studied steel.The mechanical properties for steels 1,2 and 3 have met the standards required by high load automobile crankshaft,in which the comprehensive property for No.2 is the best. | CHENG Hui-jing 1,WANG Fu-ming 1,LI Chang-rong 2,ZHANG Bo 1,XIA Yun-jin 1 (1.School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083 2.School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083) | 2011 | Journal of Iron and Steel Research(International)2011，18，S1： | 1 |
| 17 | Effect of Microalloying,Principally With Vanadium,Processing Conditions and Microstructure on Resistance to CO_2 Corrosion显示文摘One driver for steel development over recent decades has been the engineering requirements of improved strength and toughness,combined with weldability,for the safe and cost effective recovery and transmission of oil and gas.This has been achieved through refinement of grain size by microalloy precipitation and thermomechanical processing.However,little attention has been paid to these significant changes in steel chemistry and processing on corrosion resistance,despite the dominance of economic carbon steel for construction in the oil and gas industries.The more common forms of corrosion are associated with the presence of H 2 S or CO 2.CO 2 in aqueous solution forms a weak acid sufficient to promote significant localized corrosion in transmission gas/oil pipelines and in well-head applications ('down-hole').Systematic study has identified the influence of a wide range of alloying elements and different processing conditions on the resistance of low-carbon steels to CO 2 corrosion;strong carbide-forming microalloying elements such as Ti,Nb and V,along with Cr additions,and different levels of Mn,Si,Cu,Mo and Ni,have been explored,along with treatments simulating different processing conditions.The present study also emphasizes the role of V and Ti microalloying in improving the resistance of Cr-containing carbon steel to corrosion in carbonic acid and how this is influenced by microstructure and the metallurgical condition of the microalloying addition,in particular,the extent of precipitation.It is noted that some commercially available corrosion inhibitors contain V as a vanadate compound to interfere with the corrosion process and so it is suggested that V microalloying may also be beneficial if present in an appropriate form in the steel.That Ti also seems to play a role in corrosion in the steels studied is judged to be compatible with the thermodynamics of transition metal anions in the Ti-V-Cr group. | Edmonds David Cochrane Robert Grau Rosa | 2011 | Journal of Iron and Steel Research(International)2011，18，S1： | 1 |
| 18 | Recent Development and Applications of V Microalloying Technology in China显示文摘This paper reviews recent developments of V microalloying technology and its applications in HSLA steels.Enhanced-nitrogen in V-containing steel promotes precipitation of fine V(C,N) particles,and improves markedly precipitation strengthening effectiveness of vanadium,therefore,there is a significant saving of V addition in the same strength requirement.Vanadium can be used effectively for ferrite grain refinement by the nucleation of intragranular ferrite promoted by VN precipitates in Austenite.The combination of intragranular ferrite (IGF) on VN particles and the recrystallization controlled rolling (RCR) technology realize the grain refinement in V-containing steel.V-N process is a cost-effective way for high strength rebars,forging steels and thin slab direct rolling strips. | YANG Cai-fu,SU Hang,CHAI Feng,PAN Tao,ZHANG Yong-quan (Central Iron and Steel Research Institute,Beijing 100081,China) | 2011 | Journal of Iron and Steel Research(International)2011，18，S1： | 1 |
| 19 | A Strategy of Avoiding Delayed Fracture in Ultrahigh Strength Automotive Steels by Nb Microalloying显示文摘Recently the automotive industry has been confronted with the phenomenon of delayed fracture.This phenomenon was not relevant in earlier years since the strength level of the steels was generally below a critical level.However,delayed fracture is not necessarily related to an absolute strength value but rather to microstructural features as well as pre-existing micro-damage in the material that are likely to occur in ultrahigh strength steels.Niobium microalloying in combination with appropriate processing can effectively help to improve the resistance against delayed fracturing in such steels.The paper outlines a strategy how to achieve this based on microstructural control and hydrogen trapping. | Hardy Mohrbacher | 2011 | Journal of Iron and Steel Research(International)2011，18，S1： | 1 |
| 20 | BEHAVIOR OF Mg AND ITS EFFECT ON MECHANICAL PROPERTIES OF CAST Fe_3Al ALLOYS显示文摘Proper addition of 0.002 wt-% Mg to cast Fe3Al alloy may obviously improve the room andhigh temperature tensile properties.Auger spectra show that Mg segregates near grainboundaries as very thin layers.Observation under TEM reveals that a suitable amount of Mgenhances ability of cooperative internal deformation so that the dislocations will ease the con-tinuous slip deformation through grain boundaries.The fracture feature of Fe3Al alloy is oftransgranular cleavage at room temperature and cracks initiate at grain boundaries. | YIN Weimin GUO Yianting HU Zhuangqi Institute of Metal Research,Academia Sinica,Shenyang,China professor,Institute of Metal Research,Academia Sinica,Shenyang 110015,China | 1993 | Acta Metallurgica Sinica(English Letters)1993，6，6： | 1 |
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