碳氮共渗对马氏体钢轴承内圈接触疲劳寿命和失效机理的影响  

Effect of Carbonitriding on Contact Fatigue Life and Failure Mechanism of Martensite Steel Bearing Inner Ring

作　　者：程安生 李淑欣 鲁思渊 陈银军 金永生 CHENG Ansheng;LI Shuxin;LU Siyuan;CHEN Yinjun;JIN Yongsheng(School of Mechanical Engineering and Mechanics,Ningbo University,Ningbo 31521l,China;Zhejiang Provincial Key Laboratory of Part Rolling Technology,Ningbo 315211,China;Huanchi Bearing Group Co.,Ltd.,Cixi 315318,China;Ningbo Yinqiu Technology Co.,Ltd.,Ningbo 315207,China)

机构地区：[1]宁波大学机械工程与力学学院,宁波315211 [2]浙江省零件轧制成形技术研究重点实验室,宁波315211 [3]环驰轴承集团有限公司,慈溪315318 [4]宁波银球科技股份有限公司,宁波315207

出　　处：《机械工程材料》2023年第12期31-38,共8页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(52075271);宁波市重大科技任务攻关项目(2022Z050);慈溪市行业共性技术攻关项目(CZ2022009)。

摘　　要：对GCr15马氏体钢轴承内圈分别进行常规热处理和碳氮共渗+深冷+回火处理(简称碳氮共渗处理),通过对比研究了碳氮共渗对试验钢接触疲劳寿命及失效机理的影响。结果表明:碳氮共渗处理内圈试样中的碳化物比起常规热处理内圈试样更加均匀、弥散、细化,表面显微硬度和残余应力均显著提高;碳氮共渗处理内圈试样的额定寿命L_(10),特征寿命L_(63.2)和中值寿命L_(50)分别约为常规热处理内圈试样的5.3倍,6.7倍和6.6倍;常规热处理和碳氮共渗处理内圈试样的接触疲劳失效损伤机理均为剥落,碳氮共渗处理后的亚表面裂纹萌生位置更深,亚表面二次裂纹的萌生与主裂纹的扩展得到抑制,抗接触疲劳性能得到提升。Conventional heat treatment and carbonitriding+subzero+tempering treatment(carbonitriding treatment for short) were carried out on GCr15 martensitic steel bearing inner ring, and the influence of carbonitriding on the contact fatigue life and failure mechanism of the test steel was studied comparatively. The results show that the carbides in carbonitriding treated inner ring sample were more uniform, more dispersed and finer than those by conventional heat treatment, and the surface microhardness and residual stress increased significantly. The rated life L_(10), characteristic life L_(63.2) and median life L_(50) of carbonitriding treated inner ring sample were about 5.3 times, 6.7 times and 6.6 times those by conventional heat treatment, respectively. The contact fatigue failure damage mechanism of both conventional heat treatment and carbonitriding treated inner ring samples was spalling. The initiation of subsurface cracks of carbonitriding sample was deeper, and the initiation of secondary cracks on subsurface and the expansion of main cracks were also inhibited;there by the resistance of contact fatigue was improved.

关 键 词：碳氮共渗 马氏体钢球轴承 疲劳寿命 失效机理 滚动接触疲劳 

分 类 号：TG113[金属学及工艺—物理冶金]