激光技术2011，Vol.35Issue(2)：163-166,4.DOI:10.3969/j.issn.1001-3806.2011.02.006
扫描速率对激光熔覆层组织及耐蚀性的影响
Effect of laser scanning speeds on the microstructure and corrosion resistance of laser cladding layers
摘要
Abstract
Ni-based alloy coating was prepared on the Q235 steel by thermal spraying and laser remelting process at different scanning speeds, in order to study the effect of laser scanning speeds on the microstructure and corrosion resistance of laser cladding layers. The surface macro-morphology and microstructure were observed with an optical microscope (OM) and a scanning electronic microscope ( SEM), and the micro-hardness and corrosion resistance were measured and analyzed with the hardness tester and electrochemical corrosion method. The results show that the mierostructure becomes dense and even and the grains become tiny, while the amount of the white-bright dendrites increase and the eutectic compounds between the dendrites reduce with laser scanning speeds increasing. In addition, the micro-hardness and corrosion resistance greatly increase due to grain refinement and so on. As a result, the optimum technological parameters are 3kW in laser power, 6mm/s in laser scanning speed and 3mm in beam diameter for the Ni-based alloy cladding layer preparation. The result is expected to provide practical value for selecting reasonable laser cladding technolosical parameters to achieve optimal Performance of the cladding layer.关键词
激光技术/激光熔覆/镍基合金/扫描速率/显微组织/耐蚀性Key words
laser technique/ laser cladding/ Ni-based alloy/ laser scanning speed/ microstructure/ corrosion resistance分类
矿业与冶金引用本文复制引用
袁庆龙,冯旭东,曹晶晶,苏志俊..扫描速率对激光熔覆层组织及耐蚀性的影响[J].激光技术,2011,35(2):163-166,4.基金项目
山西省回国留学人员科研计划资助项目(2007-34) （2007-34）
