0.3C-Cr-W渗氮轴承钢的微动摩擦磨损性能

Properties of friction and wear of 0.3C-Cr-W high-performance nitriding bearing steel

利用SRV-4高温摩擦磨损试验机对0.3C-Cr-W高性能渗氮轴承钢进行了微动磨损试验,分别改变载荷和频率,研究了表面离子渗氮对摩擦磨损性能的影响。结果表明:试验钢表面渗氮后渗层厚度为238.45μm,其中白亮的化合物层厚度为9μm,主要为γ′-Fe4N和VN两种相;渗氮后试样表面的白亮化合物层具有减小摩擦因数和提高耐磨性的作用;渗氮前后试验钢的磨损机制相同,前期以粘着磨损为主,以磨粒磨损为辅;磨损后期转变为以磨粒磨损为主,以粘着磨损为辅;渗氮前试验钢的磨损体积是渗氮后的3倍以上,表面离子渗氮后试验钢的抗微动磨损性能有明显的提高。

In order to study the influence of ion nitriding on properties of friction and wear,fretting wear properties of 0.3C-Cr-W high-performance nitriding bearing steel were tested by using SRV-4high temperature friction and wear testing machine with different loads and frequencies.The results show that thickness of nitrided layer of tested steel was 238.45μm after nitriding,including compound layer of 9μm.The compound layer which is mainly composed ofγ′-Fe4 N and VN can reduce friction coefficient and enhance properties of friction and wear.The wear mechanisms of samples before and after nitriding are the same one.In early stage of wear,the main wear mechanism is adhesion wear and the auxiliary wear mechanism is abrasive wear.In later stage,the wear mechanism turns to opposite.The wear volume of sample without nitriding is more than 3times of the one after nitriding.The friction and wear properties of samples enhance significantly after nitriding.