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The effect of laser surface melting on grain refinement of phase separated Cu-Cr alloy
Zhang LT(张犁天); Yu G(虞钢); Li SX(李少霞); He XL(何秀丽); Jie XY(解晓宇); Xia CY(夏纯阳); Ning WJ(宁伟健); Zheng CY(郑彩云)
Corresponding AuthorYu, Gang(gyu@imech.ac.cn)
Source PublicationOPTICS AND LASER TECHNOLOGY
2019-11-01
Volume119Pages:10
ISSN0030-3992
AbstractGrain refinement and homogenization of Cr phase were achieved by laser surface melting (LSM) method, and the properties of Cu-Cr alloy were significantly improved. In this study, LSM of Cu-50Cr alloy (wt.%) was conducted with a high power density (10(6) -10(7) W/cm(2)) laser beam, the microstructure and the properties of melt layer were investigated. The size of Cr phase was effectively refined from hundreds of micron scale to several micron scale, and the average size of Cr particles decreased to a few hundred nanometers. High cooling rate effectively inhibited coarsening effect on the Cr particles during liquid phase separation. Spherical Cr particles were dispersed in the melt layer with a thickness of 165 +/- 20 mu m. Microhardness was obviously enhanced and the maximum hardness was 232HV, which was 2.8 times that of the substrate. Arc duration of the LSM treated contacts increased up to 18%. The withstanding voltage of the fixed and the moving contact increased to 28.7% and 35.4%, respectively. The results show that LSM is an effective method to refine the microstructure of Cu-Cr alloy, and it is a promising modification method for electrical Cu-Cr vacuum contacts.
KeywordLaser surface melting (LSM) Microstructure Grain refinement Liquid phase separation (LPS) Interruption capability
DOI10.1016/j.optlastec.2019.105577
Indexed BySCI ; EI
Language英语
WOS IDWOS:000482244400042
WOS KeywordMICROSTRUCTURE ; RESISTANCE ; STEEL
WOS Research AreaOptics ; Physics
WOS SubjectOptics ; Physics, Applied
Funding ProjectInstrument Developing Project of the Chinese Academy of Sciences[yz201636] ; National Natural Science Foundation of China[11672304] ; National Natural Science Foundation of China[11502269] ; National Natural Science Foundation of China[11272316] ; National Natural Science Foundation of China[11272317]
Funding OrganizationInstrument Developing Project of the Chinese Academy of Sciences ; National Natural Science Foundation of China
Ranking1
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/79989
Collection中国科学院力学研究所
Recommended Citation
GB/T 7714
Zhang LT,Yu G,Li SX,et al. The effect of laser surface melting on grain refinement of phase separated Cu-Cr alloy[J]. OPTICS AND LASER TECHNOLOGY,2019,119:10.
APA 张犁天.,虞钢.,李少霞.,何秀丽.,解晓宇.,...&郑彩云.(2019).The effect of laser surface melting on grain refinement of phase separated Cu-Cr alloy.OPTICS AND LASER TECHNOLOGY,119,10.
MLA 张犁天,et al."The effect of laser surface melting on grain refinement of phase separated Cu-Cr alloy".OPTICS AND LASER TECHNOLOGY 119(2019):10.
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