激光表面重熔300M超高强度钢的组织及腐蚀行为  

Microstructure and Corrosion Behavior of Ultra-High Strength Steel 300M After Laser Surface Remelting

作　　者：徐伟[1,2] 王晓光 门正兴 Xu Wei;Wang Xiaoguang;Men Zhengxing(College of General Aviation,Chengdu Aeronautic Polytechnic,Chengdu,Sichuan 610100,China;The Innovation Base of School-Enterprise Cooperation Aviation Electroic Technology in Sichuan,Chengdu,Sichuan 610100,China;Clllege of Aeronautical Manufacturing Engineering,Nanchang Hangkong University,Nanchang,Jiangxi 330063,China)

机构地区：[1]成都航空职业技术学院通用航空学院,四川成都610100 [2]四川省高等学校校企联合“航空电子技术”应用技术创新基地,四川成都610100 [3]南昌航空大学航空制造与工程学院,江西南昌330063

出　　处：《激光与光电子学进展》2020年第1期136-142,共7页Laser & Optoelectronics Progress

基　　金：四川省科技厅科技计划项目(2019YJ0519);四川省教育厅自然科学重点项目(18ZA0032)。

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704HV;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300W和扫描速率为33mm/s条件下得到的重熔层的耐蚀性最好。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 300W and 33 mm/s,respectively.

关 键 词：激光技术 显微硬度 显微组织 耐蚀性 

分 类 号：TG142[一般工业技术—材料科学与工程]