摘要
利用等离子弧堆焊方法在Q235钢板表面制备了添加TiC颗粒的NiTi合金耐磨堆焊层,并对堆焊层的微观组织和耐磨性进行研究。结果表明,在湿砂橡胶轮磨粒磨损试验条件下,当TiC加入量为55%时堆焊层的相对耐磨性最好,为Q235钢的11倍。TiC含量为55%的堆焊层由TiC、Ni3Ti及NiTi组成,堆焊层组织致密、与基材之间结合良好。堆焊层具有优异耐磨性的主要原因是TiC和Ni3Ti具有高硬度高耐磨性,起到抗磨骨架作用,而NiTi对TiC和Ni3Ti起到了支撑作用。堆焊层的磨损机制主要为塑性切削和硬质相的脆性剥落。
The titanium carbide （TIC） reinforced NiTi alloy composite coatings on Q235 mild steel were produced by plasma transferred arc surfacing （PTA）. The wear-resistance of the alloy coatings was evaluated on a MLS225 set sand rubber wheel tester coupling with Q235 mild steel. The results show that the wear-resistance of the coatings is 11 times higher than that of Q235 mild steel, when the content of TiC in the coatings is 55%. The composite coating mainly consists of TiC, Ni3 Ti and NiTi. The coating is metallurgically bonded to the substrate. The excellent wear resistance of the coating is attributed to the reinforcement of TiC, Ni3 Ti phase with high hardness and to the tough NiTi intermetallic matrix. The abrasion of the coatings are dominated mainly by plastic cutting and brittle spalling of hard phases.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2013年第3期136-139,共4页
Transactions of Materials and Heat Treatment
基金
北京市教委服务北京创新人才团队建设项目(009000543111505)
