摘要
为提高304不锈钢的摩擦学性能,将质量分数为30%和60%的球形WC添加到铁基复合粉末,采用等离子堆焊技术在其表面制备了WC增强铁基复合涂层.分析其显微组织结构、物相和显微硬度,在恒定载荷(50 N)和滑动速度(20 mm/s)下进行干摩擦磨损试验,研究其干滑动摩擦学性能.结果表明:富含Cr的固溶强化奥氏体、高硬度的Cr7C3和WC增强相的存在,提高了WC增强铁基堆焊层的硬度,30%WC和60%WC涂层的显微硬度达到HV0.2665和HV0.2724,比铁基涂层提高了21.1%和31.9%,是304基体的3.7和4倍;30%WC和60%WC涂层的摩擦系数和磨损率分别为0.59和2.639×10^(–6) mm^3·N^(–1)·m^(–1),0.42和1.111×10^(–6) mm^3·N^(–1)·m^(–1).30%WC和60%WC涂层均表现出优异的耐磨性能,其磨损机理分别为黏着磨损和二体磨粒磨损的混合机制,和三体磨粒磨损.
In order to improve the wear resistance of 304 austenitic stainless steel,the Fe-based composite coatings reinforced by spherical WC particles using plasma transferred arc were prepared by adding mass fraction 30% and 60%WC to the Fe-based composite powder,and coated on 304 stainless steel.The microstructure,phase compositions,and microhardness of coatings were determined.At a load of 50 N and a sliding speed of 20 mm/s,dry sliding wear resistances of the composite coating were investigated.The results show that the presence of WC reinforced phase,Cr_7C_3 hard phase and Cr-rich solution-strengthening austenite greatly increased the microhardness of the WC reinforced coatings.The microhardness of 30% WC and 60% WC coatings were HV0.2665 and HV0.2724,which increased by21.1% and 31.9% as compared with the Fe-based coating,and were 3.7 and 4 times as high as that of 304 stainless steel respectively.The coefficient of friction and the wear rate were 0.59 and 2.639×10^（–6） mm^3·N^（–1）·m^（–1） for 30% WC coating and 0.42 and 1.111×10^（–6） mm^3·N^（–1）·m^（–1） for 60% WC coatings.And both 30% WC and 60% WC coatings presented excellent wear resistance.Adhesive and two-body abrasive wear were predominant for 30% WC coating,whereas threebody abrasion was the main wear mechanism for 60% WC coating.
出处
《摩擦学学报》
EI
CAS
CSCD
北大核心
2018年第1期17-27,共11页
Tribology
基金
海洋公益性行业科研专项经费项目(201405013-3)
国家自然科学基金项目(51609133)
上海海事大学科研基金项目(20130448)资助~~
关键词
铁基复合涂层
球形WC
等离子堆焊
摩擦磨损
Fe-based composite coating
spherical WC
plasma transferred arc （PTA）
friction and wear
