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| 1 | Stability of Ultra-fine Microstructures during Tempering显示文摘The stability of ultra-fine microstructure during tempering at 650℃ was investigated on a Nb-containing steel. The steel had undergone 5 passes controlled rolling, then was relaxed (air cooled) to 730 ℃ and cooled in water The evolution of microstructure was that, in early stage of tempering, no obvious change was detected by means of optical microscopy while dislocation cells were formed inside bainitic laths. With further tempering, bainitic laths started to coalesce in some regions. Finally, polygonal ferrite was formed while hardness decreased dramatically. Some samples taken from the same primary plate were reheated at 930 ℃for 0.5 h followed by quenching into water before tempering. Despite their lower original hardness, the reheated samples softened faster during tempering. Ferrite was quickly formed in the reheated samples. These results indicate that the evolution of microstructures towards equilibrium during tempering of the steel is mainly determined by whether dislocations are pinned rather than the dislocation density. | Shanwu Yang, Chengjia Shang,Xinlai He, Xuemin Wang, Yi Yuan (Material Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China) | 2001 | Journal of University of Science and Technology Beijing2001，8，2： | 25 |
| 2 | Relaxation of Deformed Austenite and Refinement of Bainite in a Nb-Containing Microalloyed Steel显示文摘By means of stress relaxation and strain-induced precipitation in deformed austenite, bainite with micron sheaves size was ob-tained in Nb-containing steel. Microstructures of deformed samples isothermally relaxed for various time followed by cooling in water were examined. Stress relaxation test and transmission electron microscopy (TEM) were employed to detect precipitation of microalloy elements, such as Nb, Ti, during isothermal holding after deformation. All the samples were constituted by lath-like bainite along with acicular ferrite, but the size of bainitic sheaves and the amount of acicular ferrite were changed with relaxation time. To achieve optimum refinement, relaxation should be confined in the stage when the precipitates have sufficiently grown and started to coarsen. The sample having not undergone relaxation does not exhibit obvious refinement despite of its higher dislocation density. These results indicate that relaxation promotes bainite to refine, which is because deformed austenitic grains are divided by dislocation walls formed during rela-xation and acicular ferrite formed before bainitic transformation. | Shanwu Yang, Xuemin Wang, Chengjia Shang, Xinlai He, Yi Yuan Material Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China | 2001 | Journal of University of Science and Technology Beijing2001，8，3： | 24 |
| 3 | A Special TMCP Used to Develop a 800MPa Grade HSLA Steel显示文摘The effect of relaxation after finished rolling on structures and properties of four microalloyed steel with different content of Nb and Ti was investigated. By alloy designing and control rolling + relaxation-precipitation-control phase transformation (RPC) process, a new 800 MPa grade HSLA plate steel could be obtained, the microstructure is composite ultra- fine lath bainite/martensite. The tempering process and mechanical properties of this kind of HSLA steel were investigated. The yield strength can achieve 800 MPa, and the ductility and impact toughness is satisfied. | Chengjia Shang,Xuemin Wang, Xinlai He, Shanwu Yang, Yi Yuan Material Science and Engineering School, University of Science and Technology Beijing, Beijing, 100083, China | 2001 | Journal of University of Science and Technology Beijing2001，8，3： | 20 |
| 4 | Refinement of packet size in low carbon bainitic steel by special thermo-mechanical control process显示文摘The packet size of bainitic steel can be refined by a special relaxation-precipitation-control phase transformation (RPC)technology. When processed by RPC process, the low carbon bainitic steel composes of two kinds of main intermediate transformation phases. One is ultra-fine lath-like bainitic ferrite and the lath is less than 1 μm in width and about 6 μm in length; the alignment of laths forms a refined packet, and the size of packets is about 5-7 μm in length and about 3-4 μm in width. The other is acicular structure. The morphology and distribution of these acicular structures are influenced by relaxation process, the thin and short acicular structures cut the prior austenite grain and refine the bainitic packet size. For the optimum relaxation time, the packet size can be refined to the finest. The mechanical properties are influenced by relaxation time and the 800 Mpa grade low carbon bainitic steel with excellent toughness can be obtained by RPC process. | Chengjia Shang Xuemin Wang Shanwu Yang Xinlai He Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China | 2004 | Journal of University of Science and Technology Beijing2004，11，3： | 15 |
| 5 | Stress-strain behavior of multi-phase high performance structural steel显示文摘A series of ferrite/bainite(F/B) multi-phase steels containing different volume fractions of ferrite were obtained.The effect of soft phase(ferrite) content on the work-hardening behavior of the steel was studied by the finite element simulation with V-BCC model and the modified Crussard-Jaoul(C-J) analysis.It is shown that the multi-phase steels have an excellent anti-deformation ability,such as higher stress ratio(R t1.5 /R t0.5),higher uniform elongation and lower yield to tensile strength ratio.For the F/B multi-phase steels,increasing the proportion of ferrite would help to increase the uniform elongation.However,introducing much more fraction of ferrite would not be helpful to improve the stress ratio of multi-phase steel.The ferrite plastic strain constrained by bainite would be beneficial to increasing the work hardening rate.The optimum proportion of ferrite will result both higher stress ratio and uniform elongation in multi-phase steel. | NIE WenJin WANG XueMin WU ShengJie GUAN HaiLong SHANG ChengJia | 2012 | Science China(Technological Sciences)2012，55，7： | 8 |
| 6 | Formation and evolution of layered structure in dissimilar welded joints between ferritic-martensitic steel and 316L stainless steel with fillers显示文摘Dissimilar high-energy beam(HEB)welding is necessary in many industrial applications.Different composition of heat-affected zone(HAZ)and weld metal(WM)lead to variation in mechanical properties within the dissimilar joint,which determines the performance of the welded structure.In the present study,appropriate filler material was used during electron beam welding(EBW)to obtain a reliable dissimilar joint between reduced-activation ferritic-martensitic(RAFM)steel and 316L austenitic stainless steel.It was observed that the layered structure occurred in the weld metal with 310S filler(310S-WM),which had the inferior resistance to thermal disturbance,leading to severe hardening of 310S-WM after one-step tempering treatment.To further ameliorate the joint inhomogeneity,two-step heat treatment processes were imposed to the joints and optimized.δ-ferrite in the layered structure transformed intoγ-phase in the first-step normalizing and remained stable during cooling.In the second-step of tempering,tempered martensite was obtained in the HAZ of the RAFM steel,while the microstructure of 310S-WM was not affected.Thus,the optimized properties for HAZ and 310S-WM in dissimilar welded joint was both obtained by a two-step heat treatment.The creep failure position of two dissimilar joints both occurred in CLAM-BM. | Guoliang Liu Shanwu Yang Jianwen Ding Wentuo Han Lujun Zhou Mengqi Zhang Shanshan Zhou RDKMisra Farong Wan Chengjia Shang | 2019 | Journal of Materials Science & Technology2019，35，11： | 4 |
| 7 | Effects of inclusions on microstructure and properties of heat-affected-zone for low-carbon steels显示文摘The characteristics of inclusions in two types of low-carbon steels by different deoxidization methods have been investigated by using the welding thermal simulation,the optical microscopy and scanning electron microscopy.In addition,the effects of inclusions on microstructure and properties of heat-affected-zone were studied.The nucleation and growth of intragranular acicular ferrite was observed in situ by the laser scanning confocal microscopy.The distribution of Mn element near the inclusion was also analyzed by the auger electron spectroscopy.The results showed that the inclusions in Al killed steel are mainly aluminum oxides,manganese sulfide and titanium nitrides,and that the inclusions in Ti killed steel are mainly titanium oxide,manganese sulfide complex inclusion and single manganese sulfide.The auger electron spectroscopy showed that there is an Mn-depleted zone near the interface of TiO x /MnS complex inclusion in the size of 1-3 m.It could be the effective nucleus of intragranular acicular ferrite which could divide the prior austenite grains,inhibit the growth of low-temperature microstruc-ture,and refine the final microstructure,so as to improve the toughness of heat-affected-zone significantly. | ZHENG ChaoChao WANG XueMin LI ShuRui SHANG ChengJia HE XinLai | 2012 | Science China(Technological Sciences)2012，55，6： | 4 |
| 8 | Latest Development and Application of High Strength and Heavy Gauge Pipeline Steel in China显示文摘 | Zhang Yongqing Guo Aimin Shang Chengjia Liu Qingyou J. Malcolm Gray Frank Barbaro | 2016 | Journal of Mechanics Engineering and Automation2016，6，1： | 3 |
| 9 | Effect of austenite grain size and accelerated cooling start temperature on the transformation behaviors of multi-phase steel显示文摘The transformation behaviors and microstructures of a low carbon multi-phase steel were investigated by the simulation of deformation-relaxation-accelerated cooling processing,using a Gleeble 3500 thermal-mechanical simulator.A pre-treatment of solid solution at 1200°C was implemented to minimize the influence on transformation from solid solution/precipitation qualities of 0.08%Nb in this steel.On this basis,the effect of austenite grain size and accelerated cooling start temperature were studied individually.The results indicated that the transformation of ferrite in multi-phase steel could be significantly promoted by the refinement of austenite grains and the increase of relaxation time,while the hard phase,such as lath bainite or martensite,could still be obtained with the following accelerated cooling.In contrast,more uniform lower temperature transformed microstructure could form from coarse grain austenite.The potential benefit of austenite grain size on adjusting the proportion of phases in multiphase steel was also discussed. | LI XiuCheng XIA DianXiu WANG XueLin WANG XueMin SHANG ChengJia | 2013 | Science China(Technological Sciences)2013，56，1： | 2 |
| 10 | Principle and Experiment of Protein Detection Based on Optical Fiber Sensing显示文摘表面血浆回声(SPR ) 被建议完成蛋白质的踪迹数量的快联机即时察觉的为基于倾斜的纤维布拉格栅栏(TFBG ) 检测蛋白质分子的一个方法。TFBG-SPR 蛋白质的察觉原则分子的探查被分析,并且它的可行性被表明。在在纤维栅栏外面的蛋白质分子和金色的层之间的中间人材料是 cysteamine hydrochloride。当 cysteamine hydrochloride 答案的集中是 2 M 时, TFBG 回声山峰的移动是 2.23 nm,说明 cysteamine hydrochloride 成功地修改金电影。IgG 抗原答案在修改扔黄金的 TFBG 的 cysteamine hydrochloride 的表面上被倒。最后,抗原抗体杂交实验与 10 mg/mL 抗体答案被执行,并且在二小时杂交以后, TFBG 的回声山峰转移 5.1 nm,它验证 TFBG-SPR 蛋白质的可行性和有效性分子的探查。 | Qi JIANG Mengwei XUE Pei LIANG Chengjia ZHANG Jianqiang LIN Jun OUYANG | 2017 | Photonic Sensors2017，7，4： | 2 |
| 11 | Influence of Carbon Content and Microstructure on Corrosion Behavior of Low Alloy Steel in a CI-Containing Environment 显示文摘 | Guo Jia Yang Shanwu Shang Chengjia | 2008 | Corros Sci2008，51，242： | 1 |
| 12 | Detection analysis and research of hydraulic turbine runner cracks显示文摘 | LI Chengjia ZHANG Shuangping | 2001 | Northwest Eclectic Power Technology2001，，6： | 1 |
| 13 | Visual Speech Recognition Based on Improved Type of Hidden Markov Model 显示文摘 | ZHANG Zeliang LI Xiongfei YANG Chengjia | 2012 | Journal of Convergence Information Technology2012，7，13： | 1 |
| 14 | The refinement technology for bainite and its plication显示文摘 | Wang Xuemin Shang Chengjia Yang Shanwu al | 2006 | Materials Science and Engineering:2006，，： | 1 |
| 15 | Epitaxial growth and thermal-conductivity limit of singlecrystalline Bi2Se3/In2Se3 superlattices on mica显示文摘在超点阵的热运输被各种各样的散布声子的过程管理。为在 chalcogenide 超点阵提取异种接口的散布声子的贡献,单人赛水晶的双性人 2 Se 3/In2 有最小化的缺点的 Se 3(BS/IS ) 超点阵被分子的横梁取向附生在 fluorophlogopite 云母上准备。BS/IS 超点阵的跨飞机的进行热的性质被表明精确取决于时期厚度和超点阵的成分,在在热传导性的最小显示一条转线路从的地方对在超点阵的像波浪的声子运输像粒子。BS/IS 超点阵的热传导性的最小比内在的 BS 电影的低将近一个数量级。 | Wuyang Ren Handong Li Lei Gao Yong Li Zhongyang Zhang Chengjia Long Haining Ji Xiaobin Niu Yuan Lin Zhiming Wang | 2017 | Nano Research2017，10，1： | 1 |
| 16 | Characteristics of Climate Change and its Response in the Qinghai-Tibet Plateau during 1971-2010显示文摘Climate data during 1971-2010 showed that mo st areas of Qinghai-Tibet Plateau showed warm wet climate change type dominated by temperature and humidity increase.Temperature increase magnitude was the smallest in spring and the largest in winter,and the precipitation increased at the low-altitude area and decreased at high altitude.The warm wet climate change caused Qinghai-Tibet Plateau alpine grassland degradation,reduction of glacier and frozen soil,wetland reduction and other environmental problems. | ZHANG Zhichun HAN Wenling WANG Jun CAI Yongxiang LI Gang CAI Zhongzhou ZHANG Chengjia SHENG Haiyan ZHAO Chaojun | 2016 | Journal of Landscape Research2016，8，6： | 1 |
| 17 | Effects of eddy currents on retarded modes of lateral semiconductor antiferromagnetic/non-magnetic superlattiee显示文摘 | Litao Chengjia | 2003 | Padfic Science Review2003，5，1： | 1 |
| 18 | Investigation on the microstructure and toughness of coarse gTained heat affected zone in X- 100 multi-phase pipeline steel with high Nh content 显示文摘 | You Yang Shang Chengjia Nie Wenjin | 2012 | Materials Science and Engineering: A2012，558，： | 1 |
| 19 | Influence of carbon content and microstructure on corrosion behaviour of low alloy steels in a Cl ? containing environment显示文摘 | Jia Guo Shanwu Yang Chengjia Shang Ying Wang Xinlai He | 2008 | Corrosion Science2008，，2： | 1 |
| 20 | Influence of Car- bon Content and Microstructure on Corrosion Behaviour of Low Alloy Steels in a C1-Containing Environment显示文摘 | Guo Jia Yang Shanwu Shang Chengjia | 2008 | Corro- sion Science2008，，51： | 1 |
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