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| 1 | An Aluminide Surface Layer Containing Lower-Al on Ferritic-Martensitic Steel Formed by Lower-Temperature Aluminization显示文摘An aluminide(AlFe and α-(FeAl)) surface layer containing lower-Al was formed on ferritic-martensitic steel P92 by means of surface mechanical attrition treatment(SMAT) combined with a duplex aluminization process at lower temperatures,i.e.a packed aluminization followed by a diffusion annealing treatment below its tempering temperature.Indentation tests indicated that the lower-Al surface layer formed on the SMAT sample is more resistant to cracking and has better adhesion to the substrate in comparison with the Al_5Fe_2 layer formed on the as-received sample after the duplex aluminization process.Isothermal steam oxidation measurements showed that the oxidation resistance is increased significantly by the lower-Al surface layer due to the formation of a protective(Fe,Cr)Al_2O_4 layer.The rate constant of oxidation was estimated to decrease from-0.849 mg^2 cm^(-4)h^(-1) of the as-received material to^0.011 mg^2 cm^(-4) h^(-1) of the AlFe layer at 700 ℃. | S.Guo Z.B.Wang K.Lu | 2015 | Journal of Materials Science & Technology2015，31，12： | 6 |
| 2 | Low-Temperature Nitriding by Means of SMAT显示文摘The microstructure in the surface layer of iron and steel samples can be refined at the nanometer scale by means of a surface mechanical attrition treatment (SMAT) that generates repetitive severe plastic deformation to the surface layer. The subsequent nitriding kinetics of the as-treated samples with the nanostructured surface layer is greatly enhanced so that the nitriding temperatures can be reduce to 300 - 400 °C regions. This enhanced processing method demonstrates both the technological significance of nanomaterials in advancing the traditional processing techniques, and provides a new approach for selective surface reactions in solids. This article reviews the present state of the art in this field. The microstructure and properties of SMAT samples nitrided will be summarized. Further considerations of the development and applications of this new technique will also be presented. | W.P.Tong H.W.Zhang N.R.Tao Z.B.Wang J.Lu K.Lu | 2004 | 材料热处理学报2004，25，5： | 3 |
| 3 | Correlation between depassivation and repassivation processes determined by single particle impingement:Its crucial role in the phenomenon of critical flow velocity for erosion-corrosion显示文摘The correlation between depassivation and repassivation processes,which is significant in erosioncorrosion,was quantitatively investigated by single particle impingement tests at various flow velocities and impact angles.The results show that both repassivation and depassivation processes are associated with the kinetic energy of solid particle,and demonstrate that the repassivation is retarded by depassivation.This phenomenon probably results from the depassivation-induced microstructure evolution.On this basis,the dependence of critical flow velocity(CFV)for erosion-corrosion on the solid particle concentration and diameter is further theoretically predicted and experimentally verified.Accordingly,the crucial role of depassivation-repassivation in CFV phenomenon is further highlighted. | L.L.Li Z.B.Wang S.Y.He Y.G.Zheng | 2021 | Journal of Materials Science & Technology2021，，30： | 3 |
| 4 | Strain-induced formation of a gradient nanostructured surface layer on an ultrahigh strength bearing steel显示文摘In the present work, an ultrahigh strength bearing steel(AISI 52100) was subjected to surface mechanical rolling treatment(SMRT) at room temperature. Microstructural observations showed that martensitic laths, twins and cementite particles in the initial microstructure underwent distinct plastic strains and were gradually refined into nanostructures. Consequently, a gradient nanostructured(GNS) surface layer with a mean grain size of ~24 nm at the top surface was obtained on the bearing steel, resulting in an increment of ~20% in the surface hardness. Analyses based on microstructural evolution, phase constitution and in-depth hardness distribution revealed a mechanically induced formation mechanism of the GNS surface layer. The multiple surface severe plastic deformation under fine lubrication and cooling during SMRT contributed to the formation of a thick hardened surface layer on the bearing steel. | K.Zhang Z.B.Wang | 2018 | Journal of Materials Science & Technology2018，34，9： | 2 |
| 5 | Diffusion behavior of Cr in gradient nanolaminated surface layer on an interstitial-free steel显示文摘Nanolaminated structures composed of low-angle grain boundaries(LAGBs) possess high thermal stability. In this paper, a gradient nanolaminated(GNL) surface layer with smooth finish was fabricated on an interstitial-free steel by means of surface mechanical rolling treatment. Microstructural observations demonstrated that the average lamellar thickness is about 80 nm in the topmost surface layer and increases with increasing depth. High thermal stability was confirmed in the GNL surface layer after annealing at 500℃. Diffusion measurements showed that effective diffusivity of Cr in GNL layer is 4–6 orders of magnitude higher than lattice diffusivity within the temperature range from 400 to 500℃. This might be attributed to numerous LAGBs or dislocation structures with a higher energy state in the GNL surface layer. This work demonstrates the possibility to advanced chromizing(or other surface alloying)processes of steels with formation of GNL surface layer, so that a thicker alloyed surface layer with a stable nanostructure is achieved. | S.L.Xie Z.B.Wang K.Lu | 2019 | Journal of Materials Science & Technology2019，35，3： | 2 |
| 6 | 含沙量对冲积河流河型的影响显示文摘黄河下游泥沙输送的机理随含沙量的变化很大。黄河下游的河道一般呈游荡型或弯曲型,显著特点是在低含沙量和高含沙量条件下都存在着强烈的河道侵蚀及游荡型河道形态,而淤积和游荡则多发生于中等含沙量条件下。一维数值模型揭示了某些河床形态可能与泥沙密度的垂向层状分布及其阻碍沉降效果有密切关系。泥沙含量不大的情况下水流是次饱和的,流速呈对数曲线分布,泥沙容重呈层状分布,次饱和水流造成河床冲刷和弯曲型河道;高含沙水流情况下,水流的紊动结构造成的含沙量纵剖面变化,形成超饱和水流;在更高含沙量(10—100kg/m^3)情况下,悬移质泥沙可造成垂向几乎为常数的宙沙量纵剖面及对数流速分布。这些可以由泥沙引起容重效应的IDV模型进行验证,而河道形态变化可由3D模型模拟。河流形态模拟揭示了在相对低含沙水流中形成游荡型河道,主要是由于河道淤积、壅水、分汊形成新流路造成。当存在高含沙水流时,河床受到冲刷,水位降低,大堤约束河道,从而减小了游荡强度。另外,落淤速度的降低造成河道淤积减弱,形成冲刷,结果高含沙水流却形成了弯曲型河道。 | D.S.van Maren J.C.Winterwerp H.J.de Vriend Z.B.Wang Z-Y Wang J.J.Zhou B.S.Wu | 2005 | 人民黄河2005，27，11： | 1 |
| 7 | Movement of tidal watersheds in the Wadden Sea and its consequences on the morphological development显示文摘Wadden 海由由潮汐的入口被连接到北方海的一系列潮汐的泻湖组成。每个泻湖的边界是大陆海岸,潮汐的入口的双方上的障碍岛,和在二个障碍岛后面的潮汐的分水岭。在每个 Wadden 岛后面,有一个潮汐的分水岭,分开二个邻近的潮汐的泻湖。在 Wadden 海的潮汐的分水岭的地点没被修理。特别在在潮汐的泻湖之一的人的干扰以后,一个潮汐的分水岭能移动并且从而影响在泻湖之间的区域的分发。这看起来为在干扰在,而且在邻近的盆发生,而且在邻近的盆的不仅盆的词法发展重要。这份报纸描述针对在象 Wadden 海一样的一个多盆系统的词法开发改进卓见进潮汐的分水岭的运动的潮汐的分水岭,他们的运动,和影响的地点的理论分析和数字建模。 | Z.B.WANG J.VROOM B.C.van PROOIJEN R.J.LABEUR M.J.F.STIVE | 2013 | International Journal of Sediment Research2013，28，2： | 0 |
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