摘要
采用透射电子显微镜(TEM),对细晶高强IF钢在不同退火温度条件下无沉淀析出区(PFZ)的形成机制及其对材料力学性能的影响规律进行研究。结果表明,由于析出相粒子的固溶和粗大化与晶界迁移造成的扫动效应,导致仅在晶界一侧形成独特的无沉淀析出区,退火过程中无沉淀析出区优先在晶界经过的区域形成。在退火过程中,随着退火温度的升高,细晶高强IF钢无沉淀析出区的平均宽度增大,其屈服强度降低,n值逐渐增加。
The formation mechanism of precipitation free zone of fine-grain and high-strength IF steel and its effect on the mechanical properties of materials at different annealing temperatures were investigated by means of transmission electron microscopy( TEM). The results show that the formation of precipitation free zone just at the side of the grain boundary is caused by the solid solution and growth of the precipitated phase particles and sweep effect caused by grain boundary migration,and the formation of precipitation free zone is preferred in the region swept by the grain boundary in the process of annealing. With the increasing of annealing temperatures,the average width of precipitation free zone increases,the yield strength is reduced,the value of n increases gradually in the process of annealing.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2015年第6期144-148,共5页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51474127)
关键词
细晶高强IF钢
无沉淀析出区
退火温度
力学性能
fine-grain and high-strength IF steel
precipitation free zone
annealing temperature
mechanical property
