42CrMo钢活塞杆表面氧氮复合渗层的显微组织和耐磨性能  

Microstructure and wear resistance of oxynitriding layer on piston rod surface of 42CrMo steel

作　　者：王自力 陈荣发[1] 郑志伟 何玉龙 史敏杰 王锴 周晓进 Wang Zili;Chen Rongfa;Zheng Zhiwei;He Yulong;Shi Minjie;Wang Kai;Zhou Xiaojin(School of Mechanical Engineering,Yangzhou University,Yangzhou Jiangsu 225009,China;Tongfu Heat Treatment(Kun Shan)Co.,Ltd.,Suzhou Jiangsu 215300,China;Yangzhou Panfeng Net Co.,Ltd.,Yangzhou Jiangsu 225009,China)

机构地区：[1]扬州大学机械工程学院,江苏扬州225009 [2]通富热处理(昆山)有限公司,江苏苏州215300 [3]扬州攀峰网络科技有限公司,江苏扬州225009

出　　处：《金属热处理》2021年第8期225-229,共5页Heat Treatment of Metals

基　　金：国家自然科学基金(51872254);2019年扬州市校合作专项(YZ2019129);2019年扬州市邗江区科技计划(HJM2019006)。

摘　　要：采用气体氧氮复合处理对42CrMo钢活塞杆进行表面改性和耐磨性能研究,通过金相分析、显微硬度测试及干摩擦磨损试验等方法对比分析了不同表面工艺处理后的试样组织和性能。结果表明:调质态42CrMo钢经8 h气体氧氮复合处理后表面形成了1~2μm由Fe_(3)O_(4)组成的氧化层及ε-Fe_(2-3)N和γ'-Fe_(4)N组成的约18μm厚的化合物层,有效渗层的总厚度约为340μm。在相同干摩擦条件下,未处理的基材试样与镀铬处理试样的磨损机制为磨粒磨损并伴随轻微粘着磨损。气体氧氮复合处理后试样具有最低平均摩擦因数和磨损率,磨损机制为磨粒磨损,耐磨性能最优。Surface modification and wear resistance of 42CrMo steel piston rod were studied by using gas oxynitriding composite process.The specimens treated by different surface processes were characterized and analyzed by means of metallographic analysis,microhardness test and dry friction and wear test.The results show that after gas oxynitriding treatment of the quenched and tempered 42CrMo steel for 8 h,at which the surface composed of oxide layer of 1-2μm with Fe_(3)O_(4)and compound layer of 18μm withε-Fe_(2-3)N andγ'-Fe_(4)N can be obtained.The effective modified thickness is about 340μm.Under the same dry friction conditions,the wear mechanism of the specimens without treatment and with chromium plating treatment is abrasive wear accompanied by slight adhesive wear.After gas oxynitriding composite process,the specimen has the lowest average friction coefficient and wear rate,and the wear mechanism is abrasive wear,which has the best wear resistance.

关 键 词：42CRMO钢 气体氧氮复合处理 显微硬度 耐磨性 磨粒磨损 

分 类 号：TG156.8[金属学及工艺—热处理]