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Q345B钢板坯角部横裂纹成因分析李菊艳1,文光华1,唐萍1,郭秋实1(1.重庆市重庆大学材料科学与工程学院)摘 要:用金相显微镜,扫描电镜和能谱仪分析了某钢厂Q345B钢板坯角部横裂纹的特征和成因.结果表明:裂纹是由沿奥氏体晶界析出的MnS复合析出物和先共析铁素体膜造成的.铸坯凝固过程中,微细硫化锰沿奥氏体晶界析出,当铸坯表面温度降低到奥氏体向铁素体转变温度范围时,微细硫化物促进膜状先共析铁素体的形成,受到矫直应力作用时,应力主要集中在膜状铁素体相上,并在硫化物周围形成微孔,微孔聚合导致裂纹的形成.
));(100)Al3(Sc1-xZrx)超点阵中心暗场像进一步表明(见图6(d)~(e)),该粒子为球形,具有高密度,可阻碍位错运动(见图6(e)).Al3(Sc1-xZrx)粒子与晶界和位错的强烈交互作用,是Al-Zn-Mg-Sc-Zr合金在热处理过程中保持非再结晶组织的主要原因. 图6 固溶态合金TEM显微组织 Fig. 6 TEM microstructures..., Changsha 410083, China) Abstract: In this paper, the effects of 0.10% Sc and 0.09% Zr (mass fraction) on microstructures and properties of extruded Al-5.98Zn-1.88Mg-0.41Cu alloy bars during preparation......
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Microstructures of an AlSi7Mg alloy by near-liquidus castingGAO Ming1,2), WANG Ping3), LU Guimin3), and CUI Jianzhong3) 1) School of Physics Science & Technology, Shenyang Normal University, Shenyang 110034, China 2) Key Laboratory for Microstructure & properties of Advanced Materials, Education Committee of Liaoning Province, Shenyang Normal University, Shenyang 110034, China 3) Key......
Microstructures in a Nb-Cr-V-W-Ta high entropy alloy during annealingS.K.Varma1,Francelia Sanchez1,C.V.Ramana21. Department of Metallurgical, Materials and Biomaterials Engineering, The University of Texas at El Paso2. Mechanical Engineering Department, The University of Texas at El Paso摘 要:A Nb-Cr-V-W-Ta high entropy alloy has been subjected......
Effects of microstructures on mechanical properties of Ti-63 titanium alloyYUE Qianga, LIU Yuqinb, WANG Dingchunc, WANG Xizhea, CHU Maoyoua, and SHEN Jianyuna a Mining, Metallurgy & Materials Research Department, General Research Institute for Nonferrous Metals, Beijing 100088, China b School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China c Baoji......
Microstructures and mechanical properties of Nb-alloyed CoCrCuFeNi high-entropy alloysGang Qin,Shu Wang,Ruirun Chen,Xue Gong,Liang Wang,Yanqing Su,Jingjie Guo,Hengzhi FuSchool of Materials Science and Engineering, Harbin Institute of Technology摘 要:Nb has a positive effect on improving the mechanical properties of metal materials, and it is expected......
Microstructures and mechanical properties of hot-pack rolled Ti-43Al-9V-Y alloy sheet KONG Fan-tao(孔凡涛), CHEN Yu-yong(陈玉勇), WANG Wei(王 威), LIU Zhi-guang(刘志光), XIAO Shu-long(肖树龙... and rolling have significant impact on the microstructure of TiAl alloys. Fig.1 shows the microstructures of the as-cast, as-forged and as-rolled Ti-43Al-9V-Y alloys. XRD patterns of materials confirm......
Electrical characteristics and microstructures of Pr6O11-doped Bi4Ti3O12 thin films CHEN Min(陈 敏)1, 2, HUANG Ke-long(黄可龙)2, MEI Xiao-an(梅孝安)1, HUANG Chong-qing(黄重庆)1, LIU Jing(刘 靖)1, CAI An-hui... Microstructures of BPT films Fig.1 shows XRD patterns of BPT films annealed at 650 ℃. XRD studies indicate that all of the BPT films consist of single phase of a bismuth-layered structure Fig.1 XRD......
Microstructures and tensile properties of as-extruded Mg-Sn binary alloys CHEN Dong(陈 冬), REN Yu-ping(任玉平), GUO Yun(郭 运), PEI Wen-li(裴文利), ZHAO Hong-da(赵宏达), QIN Gao-wu(秦高梧) Key Laboratory... samples of each alloy were employed to obtain averaged data of mechanical properties. The microstructures of alloys, etched by acetic glycol, were observed by OLYMPUS GX71 optical microscopy (OM). Scanning......