摘要
利用激光熔覆的方式将Lc-Sr-31(Fe基)合金粉末堆积在高速列车制动盘铸钢材料表面,以获得具有抗高温氧化性能的Fe基合金熔覆层。采用光学显微镜、扫描电子显微镜、能谱分析仪、X射线衍射仪等研究了熔覆层在650℃高温下经历不同氧化时间后的氧化膜组织及物相组成,进而得出该涂层体系抗高温氧化腐蚀的机理。结果显示:所制备的Fe基熔覆层与基体材料呈冶金结合状态,且无裂纹、气孔等缺陷;在650℃下连续静置100 h后,熔覆层表面形成了致密的Cr2O3和SiO2氧化膜,氧化增重现象不明显;当高温氧化时间延长至200 h后,熔覆层表面出现了较多不连续的FeCr2O4尖晶石氧化物,为基体材料提供持续的抗氧化能力。
The Lc-Sr-31(Fe-based) alloy powder was deposited on the surface of the cast-steel material of a high-speed train-brake disk via laser cladding to obtain a composite coating with high temperature oxidation resistance. Optical microscopy, scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffractometer were used to study the oxide film microstructure and phase composition of the Fe-based cladding layer, which was produced at different oxidation time at 650 ℃. Furthermore, the mechanism of high-temperature oxidation corrosion resistance was obtained. The results show that the Fe-based cladding layer and matrix material are metallurgically bonded and there are no defects such as cracks and pores. After 100-h oxidation treatment at 650 ℃, the dense Cr2O3 and SiO2 oxide films are formed on the surface of the cladding layer and there is no clear oxidation mass gain. When the high temperature oxidation time is extended to 200 h, several discontinuous FeCr2O4 spinel oxides appear on the surface of the cladding layer, which provides continuous oxidation resistance for the matrix material.
作者
韩晓辉
谢韶
李洪玉
刘艳
陈辉
Han Xiaohui;Xie Shao;Li Hongyu;Liu Yan;Chen Hui(CSR Qingdao Sifang Co.,Ltd.,Qingdao,Shandong 266111,China;School of Materials Science and Engineering,Southwest Jiaotong University,Chengdu,Sichuan 610031,China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2019年第12期71-77,共7页
Chinese Journal of Lasers
基金
国家重点研发计划(2017YFB0305905)
关键词
激光技术
激光熔覆
FE基合金
高温氧化
laser technique
laser cladding
Fe-based alloy
high-temperature oxidation
