H13钢等离子堆焊Ni60A/Cr3C2覆层的磨损及热疲劳性能  

Wear and thermal fatigue properties of Ni60A/Cr3C2 coating prepared by PTA welding on H13 steel

作　　者：刘清阳 王华君[1,2] 洪峰[3] 朱春东[1,2] 王哲涵 Liu Qingyang;Wang Huajun;Hong Feng;Zhu Chundong;Wang Zhehan(School of Materials Science and Engineering,Wuhan University of Technology,Wuhan Hubei 430070,China;Hubei Engineering Research Center for Green Precision Material Forming,Wuhan University of Technology,Wuhan Hubei 430070,China;Hubei Key Laboratory of Advanced Technology for Automotive Components,Wuhan University of Technology,Wuhan Hubei 430070,China)

机构地区：[1]武汉理工大学材料科学与工程学院,湖北武汉430070 [2]武汉理工大学湖北省材料绿色精密成形工程技术研究中心,湖北武汉430070 [3]武汉理工大学现代汽车零部件技术湖北省重点实验室,湖北武汉430070

出　　处：《金属热处理》2020年第10期175-180,共6页Heat Treatment of Metals

基　　金：国家自然科学基金面上项目(51475346,51875427);武汉理工大学优秀学位论文培育项目(2017-YS-006)。

摘　　要：采用等离子堆焊技术在H13钢基体表面上制备了Ni60A/Cr3C2堆焊覆层,研究了覆层的磨损行为和热疲劳性能。在600℃下销盘试验的结果表明,镍基碳化铬复合覆层的耐磨性是Ni60A堆焊覆层的2.8倍和基材H13钢的11.6倍。镍基覆层可以显著降低H13钢的摩擦因数,加入碳化铬则会削弱覆层的摩擦性能。随着磨损的进行,主要磨损机理从氧化磨损演变为磨粒磨损和粘着磨损。在800℃到室温下的热疲劳测试结果表明,镍基碳化铬复合覆层在48个热循环后疲劳裂纹达到200μm,早于镍基覆层的62次。这说明高温氧化促进热疲劳裂纹的产生。碳化铬增强相从镍基上剥离,导致镍基复合覆层热疲劳性能下降。Ni60A/Cr3C2 surfacing coating was prepared on the surface of H13 steel by plasma transferred arc welding(PTA)technology,and its wear behavior and thermal fatigue properties were investigated.The results of pin-on-disk wear tests at 600℃show that the wear resistance of the Ni-based Cr3C2-reinforced coating,is 2.8 times of that non-reinforced,and 11.6 times of that of the H13 steel.The nickel-based coating can significantly reduce the friction coefficient of H13 steel,and the addition of Cr3C2 will weaken the friction performance of the coating.The main wear mechanism evolves from oxidative wear to abrasive wear and adhesive wear as the wear progresses.The results of thermal fatigue test at 800℃to room temperature show that the fatigue crack reaches 200μm after 48 thermal cycles for the Ni-based Cr3C2-reinforced coating,earlier than after 62 cycles for the non-reinforced Ni-based coating.High temperature oxidation promotes the initiation of thermal fatigue cracks.The Cr3C2 reinforcing phase is peeled off from the Ni-based substrate,resulting in a decrease in thermal fatigue properties.

关 键 词：碳化铬 粉末等离子堆焊 磨损 热疲劳 

分 类 号：TG115.5[金属学及工艺—物理冶金]