材料工程Issue(3)：36-39,44,5.
直接淬火低碳贝氏体钢的回火组织与力学性能
Tempering Microstructure and Mechanical Properties of Low Carbon Bainitic Steel Directly Quenched
摘要
Abstract
Effects of different tempering temperature on the microstructure and mechanical properties of the directly-quenched steel were investigated by SEM,TEM and other experimental methods. The results indicate that the tested steel obtain the best comprehensive mechanical properties with tensile strength of 805MPa, yield strength of 719MPa, elongation of 25.8％ and impact energy of 106J at -20℃. The recovery of lath bainite become even more clear with increasing tempering temperature. The small-angle grain boundaries in lath bainite gradually disappear through motion, merging and reorganization of dislocation, which cause lath wider. It was found that bainite lath boundaries blurred, the dislocation network located in bainite and the precipitation of (Nb, Ti )(C, N) composite phase with the average size of 10-20nm after tempering at 620℃. Mechanical properties with tempering temperature show non-monotonic nature, which is ascribed to the comprehensive mechanism including the recovery softening process of dislocation substructure, and the strengthening mechanism due to the dissolution of carbon and precipitation of the second phase in bainite during tempering.关键词
回火温度/低碳贝氏体/直接淬火Key words
tempering temperature / low carbon bainitic/ directly-quenched分类
矿业与冶金引用本文复制引用
王立军,武会宾,余伟,蔡庆伍..直接淬火低碳贝氏体钢的回火组织与力学性能[J].材料工程,2011,(3):36-39,44,5.基金项目
"十一五"国家科技支撑计划资助项目(2006BAE03A06) （2006BAE03A06）
