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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......
Microstructure and Hardness of Laser Shocked Ultra-fine-grained AluminumTiantian He1), Yi Xiong1,2), Zhiqiang Guo1), Lingfeng Zhang1), Fengzhang Ren1) and Alex A. Volinsky3) 1) School of Materials... was produced by severe cold rolling, annealing and then strain- ing at ultra-high rate by a single pass laser shock. Resulted microstructure was investigated by transmission electron microscopy. Microhardness......
the minimum effect. The relationship between the hardness and grain size of the joints has a deviation from the Hall-Petch equation due to formation of high dislocation density inside the grains...Correlation between process parameters,grain size and hardness of friction-stir-welded Cu-Zn alloysAkbar Heidarzadeh,Tohid SaeidFaculty of Materials Engineering, Sahand University of Technology摘 要......
Article ID: 1003-6326(2005)06-1297-06 High temperature brazing of diamond tools YAO Zheng-jun(姚正军)1, SU Hong-hua(苏宏华)1, FU Yu-can(傅玉灿)2, XU Hong-jun(徐鸿钧)2 (1. College of Materials Science..., the brazed diamond core-drill manufactured using the new developed technique has much higher machining efficiency and much longer operating life. Key words: high temperature brazing; microanalysis......
Expulsion characterization in resistance spot welding by means of a hardness mapping techniqueH.Ghazanfari,M.NaderiDepartment of Mining and Metallurgy, AmirKabir University of Technology,424 Hafez... of molten metal from the weld nugget which usually occurs due to applying a high current for a short welding time. Expulsion has a significant impact on the final yield strength of the weld, thus......
and/or insufficient adhesion, which reduces their durability[2]. Although TiN-, CrN- or DLC-coated aluminum alloys using various physical vapour deposition(PVD) methods can achieve a high hardness... and high temperature sintering in the micro arc zone[8]. The pores give the outer ceramic layers: a high wear rate and friction coefficient, low hardness, non-uniform distribution of the hardness......
Trans. Nonferrous Met. Soc. China 22(2012) s661-s667 Effect of alloying on high temperature fatigue performance of ZL114A (Al-7Si) alloy DONG Xu-gang1, ZHOU Jie1, JIA Yao-jun1, LIU Bin2 1. College...: The effect of Cu, Fe and Ni on high-temperature mechanical performance and fatigue properties of ZL114A alloy was studied through high temperature fatigue test and SEM. The results show......
. The addition of SiC can increase the wear resistance of coatings evidently[18-19]. Some research results show that the hardness, wear resistance and high temperature oxidation resistance of coatings can... parameters. If the frequency is too high or too low, the duty ratio is too small or too big, the micro-hardness of composite coating will decrease. When the frequency is 800 Hz and the duty ratio is 1?5......
High cycle fatigue properties of die-cast magnesium alloy AZ91D-1%MM XU Yu-lei(徐玉磊)1, ZHANG Kui(张 奎)1, LI Xing-gang(李兴刚)1, LEI Jian(雷 健)2, YANG Yuan-sheng(杨院生)3, LUO Tian-jiao(罗...; Abstract: The high cycle fatigue......
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