稀土改性GCr15钢与保持架材料间的滑动摩擦磨损  

Sliding Friction and Wear between Rare Earth Modified GCR15 Steel against Cage Materials

作　　者：李林龙 杨丽琪 薛伟海 高禩洋[2] 王旭[1] 段德莉[2] 李曙[2] LI Linlong;YANG Liqi;XUE Weihai;GAO Siyang;WANG Xu;DUAN Deli;LI Shu(School of Mechanical Engineering,Liaoning Petrochemical University,Fushun 113005,China;Institute of Metal Research,Chinese Academy of Sciences,Liaoning Key Laboratory of Aero-engine Materials Tribology,Shenyang 110016,China)

机构地区：[1]辽宁石油化工大学机械工程学院,抚顺113005 [2]中国科学院金属研究所辽宁省航发材料摩擦学重点实验室,沈阳110016

出　　处：《材料研究学报》2023年第6期408-416,共9页Chinese Journal of Materials Research

基　　金：中国科学院战略性先导科技专项(XDC04040401)。

摘　　要：进行环/块实验,研究了在脂润滑条件下稀土改性的GCr15轴承钢与胶木保持架材料间的滑动摩擦学行为,并与普通GCr15轴承钢进行了对比。结果表明:虽然稀土GCr15钢与胶木材料间的摩擦系数较大,但是其磨损体积却比普通GCr15钢的小。两种轴承钢材料的去除都以磨粒磨损为主,且随着转速的提高磨损体积减小。稀土GCr15钢的磨痕表面只出现犁沟,而普通GCr15钢除了出现磨粒磨损中塑性去除的犁沟,剥落也比较多。从碳化物、非金属夹杂物和残余奥氏体等方面,研究了GCr15钢经稀土改性后的组织改善对其使役行为的影响。结果表明,虽然稀土改性在一定程度上降低了轴承钢的硬度,但却有效地抑制了GCr15轴承钢在服役中出现的磨粒磨损中的断裂去除机制——材料剥落,从而提高了其在滑动摩擦条件下的耐磨损性能。The sliding tribological behavior of rare earth-modified GCr15 bearing steel against bakelite cage material was investigated via ring/block tester under grease lubrication conditions,in comparison with the ordinary GCr15 bearing steel.The results show that although the measured friction coefficient between rare earth GCr15 steel and bakelite material is larger,its wear volume is smaller than the ordinary GCr15 steel;both bearing steels have experienced material removal mainly caused by abrasive wear,and their wear volume tends to decrease with the increasing rotation speed;only furrows can be seen on the surface of the wear scar of rare earth GCr15 steel,while the ordinary GCr15 steel has more flaking in addition to the furrows that are removed during abrasive wear.The influence of the rare earth induced microstructural improvement of the GCr15 steel on its service behavior is discussed in terms of carbides,non-metallic inclusions and retained austenite.It follows that although rare earth modification reduces the hardness of bearing steel to a certain extent,but it can effectively suppress the fracture remov al mechanism in abrasive wear,that GCr15 bearing steel inevitably appears during service,i.e.,material spalling,thereby its wear resistance under sliding friction conditions is improved.

关 键 词：金属材料 稀土改性 GCR15钢 滑动摩擦 磨损机制 

分 类 号：TG142.13[一般工业技术—材料科学与工程]