50CrVA碟形弹簧开裂原因分析  

Analysis on Cracking Cause of 50CrVA Disc Spring

作　　者：李景瑞 于永旺 杨莉 王丽娜 苏亚宁 李炯 LI Jingrui;YU Yongwang;YANG Li;WANG Lina;SU Yaning;LI Jiong(Lanzhou Lanshi Testing Technology Co.,Ltd.,Lanzhou 730314,Gansu,China;Gansu Engineering Research Center of Mechanical Equipment Material Standard and Safety Evaluation,Lanzhou 730314,Gansu,China;School of Materials Science and Engineering,Lanzhou Jiaotong University,Lanzhou 730070,Gansu,China)

机构地区：[1]兰州兰石检测技术有限公司,甘肃兰州730314 [2]甘肃省机械装备材料表征与安全评价工程研究中心,甘肃兰州730314 [3]兰州交通大学材料科学与工程学院,甘肃兰州730070

出　　处：《热处理技术与装备》2024年第4期57-61,共5页Heat Treatment Technology and Equipment

摘　　要：某平台压载系统使用的50CrVA碟形弹簧在服役过程中开裂。为查明原因,对开裂及未开裂的碟形弹簧分别进行宏观检验、化学成分分析、显微组织检验、力学性能检测和断口形貌观察。结果表明,开裂及未开裂碟形弹簧的化学成分、表面质量和力学性能均符合标准要求,显微组织均为回火屈氏体;开裂碟形弹簧内锥面与内圆面交界处存在部分脱碳层,未开裂碟形弹簧无脱碳现象;开裂碟形弹簧断口表面具有典型疲劳开裂特征。The 50CrVA disc spring used in a platform ballast system cracked during service.In order to find out the reason,the macroscopic inspection,chemical composition analysis,microstructure inspection,mechanical property inspection and fracture morphology observation were conducted on cracked and uncracked disc spring,respectively.The results showed that the chemical composition,surface quality and mechanical properties of cracked and uncracked disc springs met the standard requirements,the microstructure was tempered troostite.There was a partial decarburization layer at the junction between the inner conical surface and the inner circular surface of cracked disc springs,and no decarburization phenomenon was found in the uncracked disc springs.The fracture surface of cracked disc spring had typical fatigue fracture characteristics.

关 键 词：碟形弹簧 疲劳开裂 显微组织 

分 类 号：TG113.25[金属学及工艺—物理冶金]