快速加热条件下加热速率对E690海洋用钢显微硬度及析出物的影响  

Effects of heating rate on microstructure and precipitation of E690 marine steel under rapid heating

作　　者：樊艳秋[1] 蔡庆伍[1] 张杰[1] 

机构地区：[1]北京科技大学高效轧制国家工程研究中心,北京100083

出　　处：《金属热处理》2012年第5期15-19,共5页Heat Treatment of Metals

基　　金：中央高校基本科研业务费专项资金(NOFRF-BR-10-035B)

摘　　要：用Gleeble-3500型热模拟试验机对试验钢进行控轧+直接淬火+快速回火处理的物理模拟,研究了快速加热条件下加热速率对E690海洋用钢的显微硬度、组织、析出物的影响。结果表明,经不同加热速率回火后,试样的显微硬度呈现先升后降趋势,当加热速率为30℃/s时,硬度值达到最大;观察到的SEM形貌无大变化,加热速率对其影响不大;当加热速率为30℃/s时,析出物数量最多,颗粒细小、弥散,沉淀强化效果最强。Marine steels grade E690 were heat treated by direct quenching and tempering at 600 ℃ by rapid heating with different heating rates by use of the Gleeble-3500 thermo-simulation machinery. Effects of different heating rates on microhardness, microstructure and precipitation were investigated. The results show that after rapid tempering with different heating rates, microhardness of the specimen increase first and then decrease, and when heating rate is 30 ℃/s, its microhardness reaches the maximum ; the SEM morphology changes slightly, so heating rate has little effect on microstructure; when the heating rate is 30 ℃/s, the amount of precipitation is the most, and the particles is refined and dispersed which results in the best precipitation strengthening.

关 键 词：海洋用钢 快速加热 加热速率 显微硬度 显微组织 析出物 

分 类 号：TG156.5[金属学及工艺—热处理] TG142.41[金属学及工艺—金属学]