光纤激光熔覆铁基合金粉末对45钢表面组织和性能的影响  

Effects of Fiber Laser Cladding Fe-based Alloy Powder on Microstructure and Properties of 45 Steel Surface

作　　者：何力佳[1] 高睿[1] 赵晓杰[1] 王函[1] 

机构地区：[1]辽宁工业大学材料科学与工程学院,辽宁锦州121001

出　　处：《铸造技术》2016年第1期44-47,共4页Foundry Technology

基　　金：辽宁省自然科学基金(2013020086);2013中央支持地方高校发展专项基金(汽车零部件先进制造技术协同创新团队项目)资助

摘　　要：利用IPG-3000W光纤连续激光器和激光同轴送粉方式在45钢表面熔覆铁基合金粉末，利用金相显微镜、显微硬度计、X射线衍射仪等，分析研究激光熔覆铁基合金粉末对45钢微观组织、显微硬度的影响。结果表明：45钢光纤激光熔覆层的微观组织为胞状晶、柱状品、树枝晶和等轴晶，主要物相为Ni-Cr-Fe、γ-[Fe,Ni]；当激光功率为600W，扫描速度为0.3m／s，送粉速率为0．8g／h，靠近结合面一侧的熔覆层处最大硬度值为560HV。对比单道和多道搭接熔覆层硬度。Fe-based alloy powder coating was prepared on the surface of 45 steel by using fiber laser IPG-3000W and laser coaxial feeding powder technology. The effects of Fe-based alloy powder coating on micro-structure and micro-hardness were studied by using metallographic microscope, micro-hardness tester and X-ray diffraction. The results show that the microstructure of the laser cladding layer are cellular crystal, columnar crystal, dendrite and equiaxed crystal. The phases are composed of Ni-Cr-Fe and γ-[Fe,Ni]. The maximum hardness appears at the cladding layer near the bonding zone and the value reaches 560 HV when the laser power is 600W, the scanning rate is 0.3 m/s and the feeding rate is 0.8 g/s. By comparing the single laser cladding and the overlapping laser cladding, it is found that the hardness of the overlapping laser cladding layer is higher about 40-50 HV than the single laser cladding layer.

关 键 词：激光熔覆 显微硬度 微观组织 搭接熔覆层 

分 类 号：TG174.4[金属学及工艺—金属表面处理]