几种高速列车用弹簧钢的奥氏体晶粒长大倾向  

Austenite Grain Growth Tendency of Several Spring Steels Used for High-Speed Trains

作　　者：史显波[1,2] 赵连玉[1] 严伟[1] 单以银[1] 沈明钢[2] 杨柯[1] 

机构地区：[1]中国科学院金属研究所,辽宁沈阳110016 [2]辽宁科技大学材料与冶金学院,辽宁鞍山114051

出　　处：《钢铁》2013年第3期60-65,共6页Iron and Steel

基　　金："十一五"国家科技支撑计划资助项目(2009BAG12A07-D02);辽宁省重点攻关资助项目(2008221003)

摘　　要：弹簧钢的原奥氏体晶粒大小对其力学性能和疲劳性能有重要影响,采用光学显微镜研究了51CrV4、52CrMoV4、60Si2CrVA、60Si2MnA 4种高速列车用弹簧钢的原奥氏体晶粒在加热后的长大倾向,结合透射电镜的观察分析了4种弹簧钢具有不同奥氏体晶粒粗化温度的原因。试验结果表明,化学成分对其奥氏体晶粒长大倾向具有重要影响,弹簧钢中加入Cr、V、Mo能有效阻止原奥氏体晶粒的长大,奥氏体晶粒的粗化温度与微合金碳氮化合物的固溶温度有关。在800～1 100℃温度范围内加热,51CrV4中的奥氏体晶粒长大趋势最小,52CrMoV4和60Si2CrVA次之,60Si2MnA最大。The prior austenite grain size of spring steel has an important effect on mechanical properties and fatigue properties. The prior austenite grain growth tendency of four spring steels, 51CRV4, 52CrMoV4, 60Si2CrVA and 60Si2MnA, used for high-speed trains was investigated by optical microscopy. The reason that four spring steels showed different coarsening temperatures was analyzed by TEM observation. Experimental results show that the chemical compositions of these spring steels have an important effect on the prior austenite grain growth, the addition of Cr, Mo and V in spring steels is effective in preventing the prior austenite grain growth, and the grain-coars- ening temperature has a close relationship with the solution temperature of microalloy carbonitrides. In the temperature range of 800-1 100℃, 51CRV4 shows the smallest prior austenite grain growth tendency, 52CrMoV4 and 60Si2CrVA are the second, 60Si2MnA possesses the largest prior austenite grain growth tendency.

关 键 词：弹簧钢 奥氏体晶粒长大 第二相粒子 

分 类 号：TG142.11[一般工业技术—材料科学与工程]