摘要
采用等离子熔覆技术在H13合金钢表面熔覆Fe-Mo-Cr-Ni-B合金,利用光学显微镜(OM)、扫描电子显微镜(SEM)配合能谱仪(EDS)、X射线衍射仪(XRD)、显微硬度计以及多功能摩擦磨损试验机,对热处理前后熔覆层的组织结构、硬度和耐磨性进行分析。结果表明,Fe-Mo-Cr-Ni-B合金覆层主要由α-Fe、Mo_(2)FeB_(2)、(Mo,Fe,Cr)_(3)B_(2)和Fe_(23)(B,C)_(6)相组成;熔覆层磨损以Mo_(2)FeB_(2)硬质相的脆性剥落为主;在1000℃温度热处理后,熔覆层平均硬度达到1061HV_(0.5),相比于焊态提高了28.3%,耐磨性相比于焊态提升了42.0%。合金覆层硬度提升和耐磨性的改善可以归因于高温热处理导致的碳化物共晶组织消失、Mo_(2)FeB_(2)硬质相增多以及黏结相强度增加。
The Fe-Mo-Cr-Ni-B alloy coatings were deposited on the surface of H13 alloy steel by plasma cladding.The microstructure,hardness and wear resistance of the coatings before and after heat treatment were analyzed by optical microscope(OM),scanning electron microscope(SEM)coupled with energy dispersive spectroscopy(EDS),X-ray diffraction(XRD),microhardness tester and multifunctional tribometer.The results indicate that the Fe-Mo-Cr-Ni-B alloy coatings consist of α-Fe,Mo_(2)FeB_(2),(Mo,Cr,Fe)_(3)B_(2) and Fe_(23)(B,C)_(6) phases.The primary wear mechanism of the coating is the brittle spalling of the Mo_(2)FeB_(2) hard phase.After heat treatment at 1000℃,the average hardness of the coating is 1061HV_(0.5),showing a 28.3%improvement over the as-welded state,and the wear resistance is enhanced by 42.0%compared with that of the as-welded state.The improvement in hardness and wear resistance of the coating can be attributed to the disappearance of the carbide eutectic structure,the increase of Mo_(2)FeB_(2) hard phase,and the enhanced strength of the binder phase due to high-temperature heat treatment.
作者
柯德庆
汪威
吕正奇
潘应君
常智敏
KE Deqing;WANG Wei;LV Zhengqi;PAN Yingjun;CHANG Zhimin(State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China)
出处
《武汉科技大学学报》
CAS
北大核心
2024年第2期93-100,共8页
Journal of Wuhan University of Science and Technology
基金
武汉科技大学省部共建耐火材料与冶金国家重点实验室青年基金(2018QN04).
