摘要
采用热模拟实验方法研究了铌对Si--Mn系弹簧钢相变特征的影响,分析了NbC的形变诱导析出行为.结果表明:弹簧钢中添加微量铌,推迟了珠光体转变,马氏体转变的最小冷却速率由5℃.s-1变为3℃.s-1;细化了珠光体,改变了珠光体组织形貌,渗碳体片层变薄、形状变得不规则,出现弯曲、断续;含铌弹簧钢在850℃变形时发生了NbC的形变诱导析出,NbC的析出位置为珠光体中的铁素体片层内、珠光体球团边界和位错处,析出物颗粒直径为10～15nm,形状近似球形.
The effect of niobium on the phase transformation law of Si-Mn spring steel was studied by thermal simulation experiment,and the deformation-induced precipitation behavior of NbC was analyzed.The results show that pearlite transformation is delayed;and the minimum cooling rate of martensite transformation is reduced from 5 ℃·s^-1 to 3 ℃·s^-1.The pearlite lamellar spacing is refined,and the cementite lamellae become thinner,irregular,bending and discrete.Deformation-induced precipitation NbC locates in the ferrite lamellae,pearlite pellet borders and dislocations when the Nb-bearing spring steel was deformed at 850 ℃,and NbC is approximately spherical shape with a diameter of 10 to 15 nm
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2010年第12期1564-1568,共5页
Journal of University of Science and Technology Beijing
基金
北京市科技计划项目(No.D0404001040221)
中信-CBMM铌钢研究与开发项目(No.2007RMJS-D031)
关键词
弹簧钢
微合金化
相变规律
析出物
spring steel
microalloying
phase transformations
precipitates
