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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......
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Reliability evaluation of hardness test methods of hardfacing coatings with hypoeutectic and hypereutectic microstructuresNilay ??mez1,Can ?ivi2,Hülya Durmu?11. Department of Metallurgical... carbide/boride phases dispersed in a relatively soft steel matrix. For the hardness measurements of hardfacing coatings, depending on the microstructure, both the hardness test method and the applied......
Microstructure and hardness of Mg-based composites reinforced with Mg2Si particlesMustafa Aydin1,Cem zgür2,Osman San21. Mechanical Engineering Department, Dumlupinar University2. Ceramic Engineering Department, Dumlupinar University摘 要:Magnesium powders were mechanically alloyed with SiO2 powder particles having different particle sizes using high......
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 Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China 2) State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004......
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......
Effects of cathodic component of current on porosity and hardness characteristics of micro plasma oxidation(MPO) coatings on aluminum alloy Samir Hamid Awad, QIAN Han-cheng(钱翰城) (School... quality coatings. The main research emphasis in MPO coating development over the past years seems to be the attainment of higher hardness levels and thick coatings. The porosity of MPO coating......
Influence of Heat Treatment on Hardness of Fe-Base Hardfacing Layer Containing Multi-Alloy刘建华,张瑞军,张运坤,杨庆祥摘 要:The Influence of heat treatment on hardness... ℃, the secondary hardening property of the hardfacing layers disappears, and the tempering stability and the hardness increases with increasing quench temperature.关键词:......
Microstructural evolution and change in hardness during creep of NF709 austenitic stainless steelYan ZHAO 1),Jie ZHAO 1) and Xiaona LI 2) 1) School of Material Science and Engineering,Dalian... id="ChDivSummary" name="ChDivSummary">Microstructural evolution and the change in hardness during creep deformation of NF709 austenitic stainless steel were investigated.Creep tests were carried out......
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:In this study, the effects of tool rotational speed, tool traverse speed, and Zn content on the grain size and hardness of the friction-stir-welded(FSWed) Cu......
