摘要
通过热模拟试验研究了不同热输入条件下S355J2钢粗晶热影响区M-A组元的体积分数及形态对韧性的影响。试验结果表明,热循环峰值加热温度T_(max)一定,粗晶热影响区M-A组元的体积分数随冷却时间t_(8/5)的延长而增大,在t_(8/5)为60_s时M-A组元的体积分数增加的幅度最大;随着t_(8/5)的延长,M-A组元的形态由颗粒状向长条状和块状转变,在T_(max)较大、t_(8/5)较长时,M-A组元的形态将趋向于形成细长条状和块状;粗晶热影响区的韧性随M-A组元体积分数的增大而降低。
The effect of volume fraction and form of M-A component produced by different heat inputs on the toughness of coarse-grained HAZ of S355J2 steel was investigated through thermal simulation test. The results show that ： （a） if thermal cycle peak temperature T, is constant, the volume fraction of M-A component in the coarsegrained HAZ will increase with the prolongation of cooling time t8/5, and the increment of volume fraction of M-A component will maximize when ts/5 is as long as 60 s; （b） as the cooling time t8/5 is prolonged, the form of M-A component will change from particle shape into strip and block forms, and will become fine strip and block shapes at higher thermal cycle prak temperature Tmax for longer cooling time t8/5 ; （c） the toughness of coarse-grained HAZ will reduce with the increase in volume fraction of M-A component, and the fine strip- and block-like M-A components will exert most influence on the toughness.
出处
《热处理》
CAS
2012年第3期45-50,共6页
Heat Treatment
关键词
热模拟
热影响区
M—A组元
组织
韧性
thermal simulation
HAZ
M-A component
microstnacture
toughness
