锻压技术

热处理对SLM成形18Ni300马氏体时效钢摩擦磨损性能的影响

英文标题：Influence of heat treatment on friction and wear properties of 18Ni300 maraging steel by SLM

关键词：球盘摩擦激光选区融化（SLM） 18Ni300马氏体时效钢热处理磨损机制

分类号：TG316

出版年,卷(期):页码：2022,47(7):228-234

摘要：

采用SLM成形技术制备18Ni300马氏体时效钢，并对其进行时效热处理，采用球-盘摩擦磨损试验模拟局部高应力摩擦磨损工况。研究热处理前后试样微观组织及力学性能变化对摩擦磨损性能的影响。对热处理前后的试样进行微观组织观察，并测量其密度、硬度、抗拉强度和伸长率变化，利用3D轮廓仪和扫描电镜观察磨损区域。热处理后试样的密度变化不大，硬度由37.7 HRC提高至54.5 HRC，抗拉强度由1108 MPa提高至2028 MPa，伸长率由14.5%下降至4.6%。热处理前，试样的摩擦因数为0.40，体积磨损率为1.87×10-4 mm3·（N·m）-1，热处理后试样的摩擦因数为0.41，体积磨损率为1.41×10-4 mm3·（N·m）-1。磨损机制以磨粒磨损和粘着磨损为主，伴有轻微氧化磨损。

18Ni300 maraging steel was prepared by SLM forming technology, and its aging treatment was carried out. Then, the local high stress friction and wear condition was simulated by ball-disk friction and wear test, and the influences of microstructure and mechanical properties for samples before and after heat treatment on the friction and wear performance were studied. Furthermore, the microstructures of samples before and after heat treatment were observed, the changes in density, hardness, tensile strength and elongation were measured, and the wear area was observed by 3D profilometer and SEM. The results show that after heat treatment, the density of sample remains almost constant, the hardness increases from 37.7 to 54.5 HRC, the tensile strength increases from 1108 to 2028 MPa, the elongation decreases form 14.5% to 4.6%. Before heat treatment, the friction factor of sample is 0.40, and the volume wear rate is 1.87×10-4 mm3·（N·m）-1, while after heat treatment, the friction factor of sample is 0.41, and the volume wear rate is 1.41×10-4 mm3·（N·m）-1. Thus, the abrasive wear and adhesive wear are the main wear mechanism, accompanied by slight oxidation wear.

基金项目：

中国国家博士后基金资助项目（2019M653396）；四川省科学技术支持计划（2019JDS0006）；四川大学博士后基金资助项目（2019SCU12056）；泸州市科技计划项目（2021-GYF-2）

作者简介：陈诚（1992-），男，硕士，助教 E-mail：540154684@qq.com

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