摘要
采用喷丸强化对Cr-Ni-Mo系高强钢进行强化处理,利用销盘式摩擦磨损试验机考察了喷丸前后试样的摩擦磨损性能,研究了喷丸强化对Cr-Ni-Mo系高强钢试样的表面形貌、微观结构、显微硬度、残余应力和摩擦磨损特性的影响,进一步揭示了销盘接触摩擦过程中喷丸处理的强化机理.结果表明:喷丸强化在材料表层形成了塑性变形层并产生了位错区域,但提高了表面粗糙度;随着喷丸气压和覆盖率的增加,试样的表层显微硬度和表面残余压应力值显著提高;同时,喷丸试样表面形成的冲击弹坑改善了接触界面润滑效果,喷丸试样的摩擦系数由未处理试样的0.073最大降至0.023,其磨损率由1.25×10^(-5)mm^(3)/(N·m)最大降至0.81×10^(-5)mm^(3)/(N·m),平均摩擦系数最大降低68.49%,磨损率最大降低了35.20%;此外,原始试样的磨损机理为犁沟,喷丸试样主要为犁沟、氧化磨损和黏结磨损.
With the increase of the demand for power density of high speed and heavy duty vehicles,fatigue failure caused by insufficient strength of vehicle transmission system severely limited the carrying capacity and acceleration performance.In order to solve the fatigue problem of the mechanical transmission system of high-speed and heavy-duty vehicles,a novel Cr-Ni-Mo high-strength steel was developed by the Central Iron and Steel Research Institute.And the Cr-Ni-Mo high-strength steel was strengthening treated by shot peening treatment with different shot peening jet pressure and shot peening coverage parameters.Also,the friction and wear behavior of the Cr-Ni-Mo steel samples with and without shot peening were investigated by using a pin-on-disk tester at room temperature under lubricating conditions.The effects of different shot peening treatment parameters on the surface morphology,microstructure,microhardness,residual compressive stress and tribological behavior were comprehensive studied.Moreover,the strengthening mechanisms of shot peening treatment in the process of pin-disk contact friction was further revealed.The results showed that the plastic deformation layer and microscopic dislocations region were generated at the surface material after shot peening treatment,and with the increased of shot peening jet pressure from 0.2 MPa to 0.6 MPa,the microhardness of material surface layer and top surface residual compressive stress were significantly improved after shot peening strengthening treatment.And the increased of shot peening coverage from 100%to 300%also had significant effect.It also should be noted that the shot peening craters formed on the top surface increased the oil storage and improved the interfacial lubrication effect during the pin-on-disk tribological tests.The friction coefficient and wear rate of the Cr-Ni-Mo steel samples after shot peening strengthening treatment were lower than the samples without shot peening treatment.Compared with the untreated sample,the friction coefficient of the s
作者
张亚龙
吴鲁纪
何肖飞
王振
屈盛官
秦海迪
ZHANG Yalong;WU Luji;HE Xiaofei;WANG Zhen;QU Shengguan;QIN Haidi(School of Aerospace Engineering,Zhengzhou University of Aeronautics,Henan Zhengzhou 450046,China;Zhengzhou Research Institute of Mechanical Engineering Co,Ltd,Henan Zhengzhou 450052,China;Institute for Special Steels,Central Iron and Steel Research Institute,Beijing 100081,China;School of Mechanical and Automotive Engineering,South China University of Technology,Guangdong Guangzhou 510640,China)
出处
《摩擦学学报》
EI
CAS
CSCD
北大核心
2023年第9期1072-1082,共11页
Tribology
基金
中国博士后科学基金(2022M712920)
国家重点研发计划(2020YFB2008101)资助。
