针对Ti微合金化钢和Ti-Mo复合微合金化钢,采用淬火+回火的热处理工艺,利用扫描电镜(SEM)和透射电镜(TEM)等研究了回火温度和Mo对Ti微合金化钢组织和力学性能的影响.研究结果表明:随回火温度升高,板条马氏体逐渐转变成铁素体,两种试验钢的硬度都呈现先增大后减小的趋势;最佳的回火温度为600℃.对比两种试验钢的研究结果表明,Mo的加入使得Ti微合金化钢回火过程中板条马氏体转变为铁素体的倾向增强,析出相尺寸变小,可获得10 nm以下的(Ti,Mo)C析出颗粒,提高Ti微合金化钢的综合力学性能.
Influences of tempering temperature and Mo element on microstructure and mechanical properties of Ti microalloyed steel were investigated by means of scanning electron microscopy (SEM) and transmission electron microscopy (TEM).The results show that the lath-shaped martensite transforms to ferrite gradually with increasing tempering temperature,meanwhile,the hardness of the tested steels increases firstly and then decreases,and the optimum tempering temperature is 600 ℃.It is found that the addition of Mo enhances the transformation from lath-shaped martensite to ferrite during the tempering process of Ti microalloyed steel.The sizes of the precipitates become smaller and the comprehensive mechanical properties of Ti microalloyed steel are improved when (Ti,Mo)C precipitates with size of less than 10 nm.
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