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8篇 您的检索式:作者名="K.Lu"
    题名 作者 年代 出处 被引量
1An 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 2015Journal of Materials Science & Technology2015,31,12:6
2Low-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
3Diffusion 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 2019Journal of Materials Science & Technology2019,35,3:2
4Annealing-induced Hardening in a Nanostructured Low-carbon Steel Prepared by Using Dynamic Plastic Deformation显示文摘Lamellar nanostructures were induced in a plain martensitic low-carbon steel by using dynamic plastic deformation at room temperature.The nanostructured steel was hardened after annealing at 673 K for20 min,with a tensile strength increased from 1.2 GPa to 1.6 GPa.Both the remained nanostructures and annealing-induced precipitates in nano-scale play key roles in the hardening.L.X.Sun N.R.Tao M.Kuntz J.Q.Yu K.Lu 2014Journal of Materials Science & Technology2014,30,8:1
5Regenerative cooperative diversity with path selection and equal power consumption in wireless networks显示文摘J.LIU K.LU X.CAI M.N.MURTHI 0,,08:1
6Orientation dependence of mechanically induced grain boundary migration in nano-grained copper显示文摘Tensile tests were carried out on gradient nanograined copper samples to investigate the grain orientation dependence of mechanically induced grain boundary migration(GBM) process. The relationship between GBM and the orientations of nanograins relative to loading direction was established by using electron backscatter diffraction. GBM is found to be more pronounced in the grains with higher Schmid factors where dislocations are easier to slip. As a result, the fraction of high angle grain boundaries decreases and that of low angle grain boundaries increases after GBM.J.X.Hou X.Y.Li K.Lu 2021Journal of Materials Science & Technology2021,,9:1
7Finite element analysis of membrane wrinkling显示文摘K.Lu M.Accorsi J.Leonard 2001Int J Numer Meth Engng2001,,5:1
8Transition of deformation mechanisms from twinning to dislocation slip in nanograined pure cobalt显示文摘Deformation mechanisms of nanograined and submicron-grained pure cobalt processed by means of high strain rate shear deformation at cryogenic temperatures were studied.Microstructural analysis revealed a transition of governing deformation mechanism from deformation twinning and dislocation slip in submicron-grains to and dislocations slip in nanograins.Microhardness tests illustrated that the Hall-Petch relation slope changes consequently with the transition of deformation mechanism.Y.W.Qi Z.P.Luo X.Y.Li K.Lu 2022Journal of Materials Science & Technology2022,,26:0
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