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    • 960MPa级铌钛微合金化超高强钢第二相粒子的溶解行为

    Yajun HUI,Hui PAN,Wenyuan LI,Kun LIU,Bin CHEN,Yang CUI

    Materials for Mechanical Engineering（2018）

    Cited 4|Views7
    Abstract
    采用透射电镜与能谱仪研究了960 MPa 级铌钛微合金化超高强钢在不同加热温度及保温时间下第二相粒子的溶解行为.结果表明:试验钢中含有凝固过程中析出的尺寸大于1 μm的方形TiN粒子,在锻造过程中应变诱导析出的尺寸为200 nm~1 μm 的方形、椭球形 TiS 或Ti(C,S)粒子及尺寸小于500 nm的方形、球形、椭球形(Nb,Ti)(C,N)析出相;随着加热温度的升高,第二相粒子的数量减少,尺寸增大,随着保温时间的延长,小尺寸第二相粒子的数量减少,大尺寸第二相粒子的数量增加且其棱角变得模糊,这些粒子均为铌与钛的复合析出物;为保证铌、钛的碳氮化物能够充分溶解于奥氏体中并具有合适的奥氏体晶粒尺寸,960 MPa级铌钛微合金化超高强钢合适的加热温度为1250 ℃,保温时间为80 min.
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