Cr12MoV钢渗钒层组织及耐磨性能  

Microstructure and Wear Resistance of Vanadizing Layer on Cr12MoV Steel

作　　者：万伟[1] 黄俊[1] 罗军明[1] 

机构地区：[1]南昌航空大学材料科学与工程学院,南昌330063

出　　处：《中国表面工程》2015年第4期90-97,共8页China Surface Engineering

基　　金：江西省铜钨新材料重点实验室项目(2011-TW-08);江西省科技攻关项目(2011BBE50010);南昌航空大学博士科研启动金(EA201301029)

摘　　要：为改善Cr12MoV钢耐磨性,提高其使用寿命,通过950℃×8hTD盐浴渗钒处理在Cr12MoV钢表面制备渗钒层。利用扫描电子显微镜、能谱仪、X射线衍射和摩擦磨损试验对渗钒层组织成分和磨损性能进行检测分析,结果表明:Cr12MoV钢表面渗钒层组织均匀致密,且覆层与基体间存在明显的界面,渗钒层厚度约为9.0μm。渗钒层主要物相由VCx相组成,碳化钒覆层具有(200)和(220)晶面择优取向。经渗钒处理后试样表面显微硬度可达2 002HV0.05,约为原始试样显微硬度值的2.88倍。用GCr15钢球作为摩擦副,载荷为4.9N,滑动速度为0.1m/s,磨损时间为30min条件下,渗钒层的摩擦因数约为0.58;渗钒后试样的磨损体积约为原始试样的0.29倍,其磨损的机制主要为粘着磨损。通过TD盐浴渗钒处理,在Cr12MoV钢表面制备碳化钒涂层可有效提高其耐磨性。To improve the wear resistance and increase the working 1ife of Cr12MoV steel, the vanadizing layer was pre-pared on surface of Cr12MoV stee1 by thermal diffusion （TD） salt bath treatment at 950℃ for 8 h. The characterization of the vanadizing layers was performed by scanning electron microscopy （SEM） in combination with energy dispersive spectrometry （EDS） and X-ray diffraction （XRD）, and the wear resistance was detected by fretting wear test. The resuits show that an uniform and compact vanadizing layer is formed on surface of Cr12MoV, and the interface between layer and substrate is obvious. The thickness of vanadizing layer was approximately 9.0μm. The main phases of vanadizing layer is VCx phase, and the vanadizing layer has a perferential orientation of （200） and （220） planes. The micro-hard- ness of vanadizing layer was 2002 HV0.05, which is 2.88 times of original specimen. During the fretting wear test, the friction coefficient of vanadizing layer on1y is 0.58, and the wear volume of vanadizing specimen is 0.29 times of original specimen with a friction pair of GCr15 steel ball and the load of 4.9 N at a reciprocating sliding speed of 1.0 m/s for 30 min. The main wear mechanism of vanadizing layer is adhesive wear. As a resu1t, the wear resistance of Cr12MoV steel can be effective1y improved by vanadizing layer, which is prepared by TD salt bath treatment.

关 键 词：CR12MOV钢 TD盐浴 渗钒层 耐磨性 

分 类 号：TG174.445[金属学及工艺—金属表面处理] TB115.58[金属学及工艺—金属学]