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and improvement of hardness and wear resistance. Key words: Al-Si-Pb alloy; high current pulsed electron beam; numerical simulation; crater; quasistatic stress 1 Introduction The liquid immiscible... high current pulsed electron beam irradiation of Al-Pb alloy, three distinct zones are formed sequentially near the surface, improving considerably the alloy’s microstructure and hardness. 2) Physical......
; Abstract: The microstructural characteristics and Brinell hardness of a cylinder produced by centrifugal casting were investigated using 20% (volume fraction) SiCp/Zl104 composites... in aluminum melt can promote the refinement of primary α(Al) during solidification, and fine primary α(Al) grains can also promote the uniform distribution of SiC particles. Brinell hardness of SiCp/Zl104......
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Effects of Rare Earths and Al on Structure and Performance of High Chromium Cast Iron Containing Wolfram Huang Yongchang1,Guo Erjun1,Fu Yuanke1,Wang Liping1 (1.School of Materials Science ＆ Engineering, Harbin University of Science and Technology, Harbin 150040, China) Abstract:Effects of RE and Al on the structure, impact toughness, hardness, and wear resistance of high chromium cast iron......
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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......
with the temperature increasing below β phase transition point. Moreover, it can be also seen from hardness test that the hardness of the alloy increases firstly and then decreases with the temperature increasing. Key words: BTi-62421S alloy; hot deformation; microstructure; hardness 钛合金具有高比强度,抗蠕变性能,耐高温和耐腐蚀性,是一种重要的金属结构材料,在航空航天等领域得到广泛的应用[1-5].然而,由于钛合金材料昂贵,变形加工困难,成形工艺复杂,导致了其制件成本较高[6-7].现在,有人提出由铸造坯料直接塑性变形成形复杂制件方案[8......
J. Cent. South Univ. (2016) 23: 2838-2844 DOI: 10.1007/s11771-016-3347-y Fragmentation mechanism of low-grade hematite ore in a high pressure grinding roll YUAN Zhi-tao(袁致涛)1, LI Li-xia(李丽匣)1, HAN...-grade hematite ore in a high pressure grinding roll (HPGR) was studied based on the characteristics of comminuted products at different specific pressure levels. The major properties included......
at high temperature (see Fig.2). It can be seen from Fig.2 that the hardness of Cu decreases largely when the heating temperature is over 400 ℃. On the contrary, the hardness of Cu is stable when...J. Cent. South Univ. Technol. (2009) 16: 0902-0905 DOI: 10.1007/s11771-009-0150-z Interfacial characteristics of high frequency induction brazed Cu and pre-metalized graphite joints XIE Feng......
；维氏硬度 中图分类号:TH140.7 文献标志码:A Method for determining Vickers hardness of materials by Vickers instrumented indentation work ratio and martens hardness WANG Jia-liang, MA De-jun... hardness does not recognize during the traditional Vickers hardness testing. The instrumented indentation test were analyzed by employing dimensional theorem and finite element method, meanwhile......
