50CrVA钢弹簧的断裂分析和解决措施  

Fracture analysis of 50CrVA steel spring and its solution

作　　者：蒋宪邦[1] 梁益龙[1] 刘国栋[1] 

机构地区：[1]贵州大学材料与冶金学院贵州省材料结构与强度重点实验室,贵州贵阳550003

出　　处：《金属热处理》2011年第7期109-111,共3页Heat Treatment of Metals

基　　金：国家科技支撑计划项目(2007BAE11B03);贵州省重大专题项目(2006-6029)

摘　　要：对出现早期断裂的50CrVA弹簧材料进行金相、断口形貌和硬度分析。结果表明,磨削过程中产生的二次马氏体是弹簧失效断裂的主要原因。含二次马氏体的试样经450℃回火30 min后,可以消除其危害,硬度明显降低,弹簧的疲劳寿命有所提高。The early fracture of 50CrVA steel spring was analyzed by means of metallographic microscope,SEM and hardness tester.The results show that secondary martensite generated during the grinding process is the major cause of the spring fracture,hazard of secondary martensite for the sample can be eliminated by tempering at 450 ℃ for 30 min at the same time,the hardness is decreased,and fatigue life of the spring is increased.

关 键 词：50CrVA钢 磨削面 二次马氏体 回火 

分 类 号：TG142.1[一般工业技术—材料科学与工程]