激光与光电子学进展, 2020, 57 (1): 011404, 网络出版: 2020-01-03
激光表面重熔300M超高强度钢的组织及腐蚀行为 下载: 1185次
Microstructure and Corrosion Behavior of Ultra-High Strength Steel 300M After Laser Surface Remelting
摘要
采用光纤激光器对300M超高强度钢进行激光表面重熔处理,分析了不同激光功率和扫描速率下重熔表面的显微组织、硬度以及电化学腐蚀行为。结果表明:表面重熔区域的显微组织主要由马氏体以及残余奥氏体组成;扫描速率越大,显微硬度越高,显微硬度的均值约为704 HV;激光重熔后,材料表面的自腐蚀电位正移,腐蚀电流密度下降;在激光功率为300 W和扫描速率为33 mm/s条件下得到的重熔层的耐蚀性最好。
Abstract
In this paper, the laser surface remelting of ultra-high strength steel 300M was performed by using fiber lasers. The microstructure, hardness, and electrochemical corrosion behavior of the remelted surface at different laser powers and scanning rates were analyzed. The results show that the microstructures in the surface remelting zone primarily comprise martensite and retained austenite. The higher the scanning rate, the higher the microhardness. The average microhardness is about 704 HV. The electrochemical tests show that the self-corrosion potential of the surface of the material subsequent to laser remelting positively shifts, and the corrosion current density decreases. Thus, the corrosion resistance of the remelting layer is optimal when the laser power and scanning rate are 300 W and 33 mm/s, respectively.
徐伟, 王晓光, 门正兴. 激光表面重熔300M超高强度钢的组织及腐蚀行为[J]. 激光与光电子学进展, 2020, 57(1): 011404. Wei Xu, Xiaoguang Wang, Zhengxing Men. Microstructure and Corrosion Behavior of Ultra-High Strength Steel 300M After Laser Surface Remelting[J]. Laser & Optoelectronics Progress, 2020, 57(1): 011404.