摘要
针对M50轴承钢因残余脱碳层导致的硬度降低和摩擦性能较差的问题,采用超声表面滚压(USR)技术进行表面强化处理。通过USR引发的剧烈塑性变形实现晶粒细化和加工硬化,从而提升含残余脱碳层的M50轴承钢的表面性能。采用不同滚压道次(一道次与二道次)对试样进行处理,并开展20 min的摩擦磨损试验以评估其摩擦学性能。结果表明,经过一道次和二道次处理后,M50轴承钢表面的平均显微硬度分别提高了42.4%和47.1%,硬化层深度分别达50和70μm;平均摩擦因数分别降低5%和20%;磨痕深度则分别减小20%和40%。USR处理能够诱导位错形核并增加局部取向差,从而引发形变硬化与细晶强化机制,显著提高M50轴承钢的显微硬度,并显著改善其摩擦学性能。
Aiming at the problems that the hardness decrease and the poor tribological properties caused by residual decarburization layer for M50 bearing steel,ultrasonic surface rolling(USR)tcchnique was employed to carry out the surface reinforcement treatment.Through the severe plastic deformation caused by USR,grain refinement and working hardening were realized,thus the surface performance of M50 steel with residual decarburization layer was improved.Samples were treated using different passes(one pass and two passes)and the friction and wear experiment for 20 min was conducted to evaluate the tribological properties.The results show that after one pass and two passes treatments,the average microhardnesses are increased by 42.4%and 47.1%,respectively,the depth of hardening layers are 50 and 70μm,respectively.The average friction factors are decreased by 5%and 20%,respectively,the wear scar depths are reduced by 20%and 40%,respectively.USR treatment can induce dislocation nucleation and increase local orientation differences,thus activate strain hardening and grain refinement mechanisms,significantly enhance the microhardness and improve tribological performance of M50 bearing steel.
作者
姜宏伟
马玉洁
周鹏文
杨万里
邵斌
宗影影
JIANG Hong-wei;MA Yu-jie;ZHOU Peng-wen;YANG Wan-li;SHAO Bin;ZONG Ying-ying(AECC Harbin Bearing Co.,Ltd.,Harbin 150025,China;National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology,Harbin 150001,China)
出处
《塑性工程学报》
北大核心
2025年第11期198-207,共10页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(52475338)。
关键词
M50轴承钢
超声滚压
微观组织
显微硬度
摩擦学性能
M50 bearing steel
ultrasonic rolling
microstructure
microhardness
tribological properties
