锻压技术

电弧堆焊的热成形模具镍基合金涂层摩擦磨损性能

英文标题：Friction and wear properties on Ni-based alloy coating for hot stamping die by arc surfacing

作者：张珂珉周杰张盟盟刘雪飞赵勇

分类号：TG174.44

出版年,卷(期):页码：2019,44(10):146-151

摘要：

采用电弧堆焊工艺制备了HST327镍基合金涂层，以SDCM钢为试验参照，使用摩擦磨损试验机在不同温度条件下对HST327镍基合金和SDCM钢进行了摩擦磨损试验，应用扫描电子显微镜等观察和分析了HST327镍基合金的磨损形貌。结果表明：200 和300 ℃条件下，前20 min时，HST327镍基合金强度、硬度较低，其磨损体积急剧上升，磨损严重；随着试验时间的增加，摩擦热不断积累，磨损表面逐渐形成被压实的具有润滑、减磨作用的氧化层，磨损机制转变为粘着磨损和氧化磨损，其磨损体积在20 min后缓慢增加;在300 ℃条件下，HST327镍基合金在各个试验时间点的磨损体积比200 ℃时均有所降低。HST327镍基合金的磨损性能劣于SDCM钢，不适合用于制造热成形模具涂层。

HST327 Ni-based alloy coatings were manufactured by arc surfacing technology. Then, taking SDCM steel as test reference, the friction and wear tests of HST327 Ni-based alloy and SDCM steel were conducted by the friction and wear tester at different temperatures, and the wear morphology of HST327 Ni-based alloy was observed and analyzed by scanning electron microscope (SEM). The results show that at 200 and 300 ℃ the strength and hardness of HST327 Ni-based alloy are relatively low in the first 20 min, and the wear volume of HST327 Ni-based alloy rises sharply,and the wear is serious. With the increasing of test time, the friction heat is constantly accumulated, the worn surface gradually forms a compacted oxide layer with lubrication and wear reduction effects, the wear mechanism transforms into adhesive wear and oxidative wear, and the wear volume of HST327 Ni-based alloy increases slowly after 20 min. At 300 ℃, the wear volume of HST327 Ni-based alloy is lower than that at 200 ℃ for each test time point. Thus, the wear-resistant properties of HST327 Ni-based alloy is inferior to that of SDCM steel, which is not suitable for coating of hot stamping die.

基金项目：

工信部强基工程项目(TC160A310-20)

作者简介：张珂珉(1994-)，男，硕士研究生 E-mail：zkm_london@qq.com 通讯作者：周杰(1965-),男,博士,教授,博导 E-mail：zj_cqu@163.com

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