JG620E高强钢板回火热处理组织和性能的研究

Research on Microstructure and Mechanical Properties of JG620E Tempered High Strength Steel Plate

通过研究回火热处理温度对JG620E钢板力学性能的影响,确定了最佳的回火热处理温度区间,并利用光学显微镜、透射电子显微镜等分析方法对在此温度区间处理的试样组织与性能进行了研究。结果表明,JG620E钢板基体组织含有下贝氏体、粒状贝氏体及多边形铁素体,在基体上分布有纳米尺度TiN、NbC析出相和Cr的碳化物,获得了最佳匹配的综合力学性能。

Optimum temperature range of tempering heat treatment is determined by studying the effects of tempe- ring temperature on mechanical properties of JG620E steel plate. Microstructure and mechanical properties of specimen tempered in the temperature range have been analyzed by means of optical microscope and transmission electron micro- scope. The results show that matrix structure of JG620E steel plate are lower bainite, granular bainite and polygonal ferrite, nano - sized TiN, NbC precipitation phase and Cr carbide distribute on the matrix, optimum match of compre- hensive mechanical properties is achieved.