热处理对H08Mn2Si增材成形件磨损行为的影响

Effect of Heat Treatment on Wear Resistance of H08Mn2Si Incremental Forming Parts

以H08Mn2Si为焊丝并添加合金粉的电弧增材成型件为研究对象,在SST-ST销-盘摩擦磨损实验机上开展增材件的磨损实验研究,考察不同热处理工艺对增材层抗磨损能力的影响。采用JSM-6010型扫描电镜观察磨损试样的磨损面,采用S-3000N型超景深光学显微镜观察试样的腐蚀抛光面,分析其磨损机理。结果表明:金属增材件的耐磨性必须同时结合磨损量和摩擦系数综合分析,初期耐磨性可以通过磨损量的大小来粗略评定,后期耐磨性必须用摩擦系数来评定;经综合分析发现:热处理工艺能有效提高增材件的耐磨性,其中增材件在350℃×3 h保温、空冷热处理工艺下的耐磨性能最好,主要以磨粒磨损机理为主;750℃试样耐磨性能最差,为粘着磨损和磨粒磨损为主的混合磨损机制。

Taking the arc incremental forming part using H08Mn2Si welding wire and adding alloy powder as the research object,the wear experiment of the incremental forming part was carried out by the SST-ST pin-disc friction and wear machine.The effects of different heat treatment processes on the wear resistance of the increased layer were investigated.The wear surface of samples were observed by JSM-6010 scanning electron microscope,the polished surface of samples were observed S-3000N ultra-depth optical microscopy,and the wear mechanism was analyzed.The results show that,the wear resistance of metal parts must be analyzed combined with wear loss and friction coefficient,the initial wear resistance can be roughly evaluated by the amount of wear,and the later wear resistance must be evaluated by the friction coefficient.After comprehensive analysis,it was found that the heat treatment process can effectively improve the wear resistance of the increased parts.The wear-resistant property of the material is the best heated at 350℃for 3 h and air-cooling heat treatment,the main wear mechanism is abrasive wear.The wear resistance of sample at 750℃is the worst,which is the mixed wear mechanism of adhesive wear and abrasive wear.