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Microstructures and hardness of Ti-6Al-4V alloy staging castings under centrifugal field SUI Yan-wei(隋艳伟)1, LI Bang-sheng(李邦盛)1, LIU Ai-hui(刘爱辉)1, NAN Hai(南 海)2, GUO Jing-jie(郭景杰)1, FU Heng-zhi(傅... size, the thickness of lamellar α+β phase, and the Vickers hardness, as well as the relationships between Vickers hardness, grain size and thickness of lamellar α+β phase were investigated......
Preparation and Properties of High Hardness and Oxidation Resisting Coating Using Electric Arc Spray TANG Chun-tian1,LI Zhuo-xin1,WANG Jiang-Ping1,CUI Li1 (1.Beijing University of Technology, Beijing, 100022) 摘要:A coating with high hardness, wear and oxidation resistance was prepared by electric arc spray. The hardness,bonding strength, abrasive wear and values of porosity and oxidation......
Homogeneity of microstructure and Vickers hardness in cold closed-die forged spur-bevel gear of 20CrMnTi alloyDONG Li-ying(董丽颖)1, LAN Jian(兰箭)1, 2, ZHUANG Wu-hao(庄武豪)1(1. School of Materials Science... hardness in cold closed-die forged gear of 20CrMnTi alloy is comprehensively studied by using optical microscopy and Vickers hardness tester. The results show that the distribution homogeneity......
J. Cent. South Univ. (2017) 24: 9-16 DOI: 10.1007/s11771-017-3403-2 An optimized hardness model for carburizing-quenching of low carbon alloy steel ZHANG Xing(张星)1, TANG Jin-yuan(唐进元)1, ZHANG Xue... Central South University Press and Springer-Verlag Berlin Heidelberg 2017 Abstract: Research has been conducted about the hardness prediction for the carburizing and quenching process based......
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Effect of plastic deformation on microstructure and hardness of AlSi/Al gradient composites ZHANG Wei-wen(张卫文), LUO Zong-qiang(罗宗强), XIA Wei(夏 伟), LI Yuan-yuan(李元元) School of Mechanical...-hardness were studied on plates made from a cylindrical ingot of AlSi/Al aluminum composite. This ingot was produced by double-stream-pouring continuous casting(DSPCC). The results show that the three......
diffractrometry and Rockwell hardness testing. The results show that few nucleus of crystal is formed on the forged Fe-based alloy, the grains occur recrystallization and the second phase is composed of Ti, Y and O precipitated at grain boundary. The forged samples occur recrystallization at 1 300-1 450 ℃ through high temperature treatment. The HRC hardness is 54.8 at 1 300 ℃, because......
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composite coating were investigated. The results show that the hardness and electrodepositing speed of composite coatings obtained at an impulse current are higher than those at a direct current. The hardness and wear resistance of the coating are obviously increased by adding RE and SiC. The hardness of the coating increases with the increase of treatment temperature and current density, and reaches......
that the penetration with flux is 3 times as great as the weld without flux. With activating flux, mechanical properties are stable, but the hardness of welding with flux is higher in some extent... transformation. Key words: activating flux; elements transition; hardness 活性化焊接(Activating TIG,简称A-TIG) 方法是使用特殊的活化材料焊前涂敷到被焊工件表面,在焊接工艺参数不变的情况下,与常规的TIG焊相比,增大熔深1倍以上,而且有效减小正面焊缝宽 度[1-2......
