B4C含量对Fe基合金重熔涂层组织与性能的影响  

Effects of B4C Content on Microstructure and Properties of Fe-based Alloy Remelting Coating

作　　者：苏海龙[1] 余焕 骆宗安[1] 王宇豪 SU Hailong;YU Huan;LUO Zongan;WANG Yuhao(State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《热加工工艺》2022年第24期57-62,共6页Hot Working Technology

基　　金：国家自然科学基金资助项目(51774085)。

摘　　要：为了提高铁基合金重熔涂层的硬度和耐磨性,在铁基合金成分中加入不同含量的B_(4)C粉末,利用电子束重熔技术在45钢表面制备不同B_(4)C含量的Fe基/B_(4)C复合涂层,并进行微观组织、物相成分、宏观硬度及三体磨粒磨损实验的研究。结果表明,不同B_(4)C含量的重熔涂层与钢基体均形成了牢固的冶金结合,涂层主要由α-Fe、γ-Fe、M_(23)(C,B)6、M_(2)B、Fe_(3)C、(Fe,Ni)和(Fe,Si)组成。涂层组织随B_(4)C含量的增多而明显细化,涂层整体宏观硬度也随之提高,由0wt%B_(4)C时的64.29 HRC提高到3wt%B_(4)C时的70.45 HRC。经三体磨粒磨损实验后,重熔涂层的磨损量相比重熔前的磨损量,随着B_(4)C含量的增加呈现先增加后降低的趋势,当B_(4)C含量为3wt%时,磨损量最小,表现出最佳的耐磨性。In order to improve the hardness and wear resistance of Fe-based alloy remelting coatings,Fe-based/B_(4)C composite coatings with different B_(4)C contents were prepared on 45 steel surface by electron beam remelting technology(EBM),and the microstructure,phase composition,macrohardness and three-body abrasive wear tests were carried out.The results show that the remelted coatings with different B_(4)C contents formed firm metallurgical bonding with the steel substrate and the coatings are mainly composed of α-Fe,γ-Fe,M_(23)(C,B)6,M_(2)B,Fe_(3)C,(Fe,Ni) and (Fe,Si).The microstructure of the coating is obviously refined with the increase of B_(4)C content and the overall macrohardness of the coating also increases,from64.29 HRC at B_(4)C-free to 70.45 HRC at 3wt%B_(4)C.After three-body abrasive wear test,the wear loss of the remelted coating increases first and then decreases with the increase of B_(4)C content.When B_(4)C content is 3wt%,the wear loss is the minimum and the wear resistance is the best.

关 键 词：FE基合金 电子束重熔 宏观硬度 耐磨性 

分 类 号：TG174.44[金属学及工艺—金属表面处理]