热处理对高速列车用51CrV4弹簧钢力学性能的影响  

Effect of heat treatment on mechanical properties of 51CrV4 spring steel for high-speed trains

作　　者：王伟[1,2] 朱林[2] 胡平[2] 单以银[2] 杨柯[2] 

机构地区：[1]广东电网公司电力科学研究院,广东广州510080 [2]中国科学院金属研究所,辽宁沈阳110016

出　　处：《金属热处理》2010年第2期58-62,共5页Heat Treatment of Metals

基　　金："十一五"国家科技支撑计划(2009BAG12A07-D02);辽宁省科技攻关项目(2008221003)

摘　　要：研究了热处理工艺对满足欧洲标准要求的不同直径的高速列车用51CrV4弹簧钢的显微组织及力学性能的影响。研究结果表明,在450~500℃范围内回火后,微观组织均为回火马氏体。随着回火温度的升高,弹簧钢的硬度和强度逐渐下降,塑性和冲击值均略有提高。断口的SEM观察表明,随着回火温度的升高,裂纹的扩展路径更加曲折,表明其塑性逐渐提高。在本文的热处理条件下,不同直径钢弹簧材料的力学性能均能满足EN13298标准要求。Effect of heat treatment on microstructure and mechanical properties of 51CrV4 spring steel with different diameters for high-speed trains was investigated.The results show that tempered at 450～500 ℃,the microstructure of the tested steel consists of tempered martensite.With increasing tempering temperature,both the hardness and strength of the tested steel decrease,while the tensile and impact toughness slightly increase.The fractograph observation shows that the crack propagation path becomes more tortuous with the increase of tempering temperature,which indicats that the toughness is gradually improved.Under the tested heat treatment conditions,mechanical properties of the 51CrV4 spring steel with different diameters can satisfy the requirement of EN 13298 standard.

关 键 词：高速列车 弹簧钢 热处理 显微组织 力学性能 

分 类 号：TG142.41[一般工业技术—材料科学与工程]