脱碳对50CrMnMoNbAT板簧疲劳断裂的影响  

Effect of decarburization on fatigue fracture of 50CrMnMoNbAT leaf spring

作　　者：陈武 白亮 刘景顺[1] 刘军[1,2] 尤少东 樊茂 杨英 CHEN Wu;BAI Liang;LIU Jingshun;LIU Jun;YOU Shaodong;FAN Mao;YANG Ying(School of Materials Science and Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;Key Laboratory of Graphene Energy Storage and Coatings of Inner Mongolia Autonomous Region,Hohhot 010051,China;Inner Mongolia First Machinery Group Corporation,Baotou 014032,China)

机构地区：[1]内蒙古工业大学材料科学与工程学院,呼和浩特010051 [2]内蒙古自治区石墨(烯)储能与涂层重点实验室,呼和浩特010051 [3]内蒙古一机集团路通弹簧有限公司,内蒙古包头014032

出　　处：《内蒙古工业大学学报（自然科学版）》2023年第1期21-25,共5页Journal of Inner Mongolia University of Technology：Natural Science Edition

基　　金：内蒙古自然科学基金项目(2015BS0510);内蒙古自治区自然科学基金杰出青年培育基金项目(2020JQ05);内蒙古自治区科技计划项目(2020GG0267)。

摘　　要：分析板簧生产过程的脱碳状态及由此引起的轧制缺陷与疲劳裂纹之间的关系,研究脱碳层对轧制缺陷和裂纹扩展的影响规律。结果表明,脱碳层严重影响轧制后的表面,由于表面硬度降低,导致大量氧化皮卷入板簧表面形成轧制缺陷。在板簧使用过程中,裂纹在轧制缺陷上萌生,并向内进行扩展延伸。The relationship between decarburization state and resulting rolling defects and fatigue cracks in the production process of leaf springs was analyzed to study the influence of the decarburization layer on rolling defects and crack expansions.The results show that the decarburization layer severely affects the surface after rolling.Due to the reduction of surface hardness,a large amount of oxide skin was rolled into the surface of the plate spring to form rolling defects.In the process of spring application,cracks sprouted initially on the rolling defects and extended inward,eventually leading to fatigue fractures.

关 键 词：弹簧钢 表面脱碳 轧制缺陷 裂纹 疲劳失效 

分 类 号：TG142.1[一般工业技术—材料科学与工程]