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, microstructure and elemental distribution of the coatings were analyzed by optical microscopy (OM), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The microhardness of the coatings were tested with microhardness tester. The results show that the element composition on the substrate can cause the differences of pores and cracks. The pores and cracks of the coatings on 304......
(资源服务)标识码(OSID) 文章编号:1672-7207(2020)01-0094-09 Effect of rolling parameters on microhardness of cross-wedge rolling of 42CrMo/Q235 laminated shaft composite interface ZHNG Xiao1, 2, PENG Wenfei1, 2..., Ningbo 315211, China) Abstract: The 42CrMo/Q235 laminated shaft was formed by cross wedge rolling, and the microhardness of 42CrMo/Q235 laminated shaft composite interface was tested. The effects......
on microhardness of pure copper GAO Bo, WANG Jin, GAO Song-song, ZHANG Zhi-gang, ZHANG Xiao-bo (Department of Mechanical Engineering, Qingdao Technological University, Qingdao 266033, China) Abstract: T2 pure... as lubrication method, on the microhardness of material surface were studied. The results show that the microhardness of the material surface increases with the speed increasing from 3000 r/min to 5000 r/min......
microhardness is HV 670.4 after being sintered at 1 950 ℃ for 120 min in H2, which is 29.3% higher in comparison with pure tungsten. Key words: W-TiC alloy; sintering behavior; microstructure; microhardness 金属钨具有高熔点,高弹性模量,优良的高温强度,良好的耐热冲击性能,良好的导热性以及抗中子辐射能力强等优点,是航空航天和原子核能等尖端领域中一种理想的超高温结构材料[1-6].但是由于纯钨密度较高,且随着温度的升高强度急剧降低,在1 000 ℃时的强度相对室温下降了60%[6-11],严重限制了其在更高温工作领域中的应用.TiC不仅具有高熔点 (＞3......
cast iron inoculated with 20%FeSi75+80% Sr inoculants exhibited the best machinability, the low-est cross-section sensibility and the least microhardness difference. The tool flank wear of the drill increased correspondingly with the in-crease of the microhardness difference of the matrix, indicating the great effect of homogeneity of the matrix on the machinability of gray cast iron. Key words......
and with good appearance, were prepared to substitute the hard chromium coating. The effects of electrolyte solution composition and process conditions on the microhardness, appearance, deposition rate... heat treatment temperatures on the microhardness of the coatings prepared under the optimized condition were measured. The polarization of electrolyte was analyzed. The surface morphology......
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. The effects of the concentration of the ball-milled Si/Ni particles in the electrolyte on the silicon content, structure, microhardness and corrosion behaviors of the coatings were investigated. Scanning electron microscopy and X-ray diffractometry were used for structural characterization. Also, the microhardness and corrosion behaviors of the deposited coatings were evaluated. According to the results......
