热处理工艺对Q890高强钢组织及析出相的影响  

Effect of heat treatment process on microstructure and precipitates of Q890 high strength steel

作　　者：安涛 郭呈宇 李天怡 张弛 代春朵 张哲 An Tao;Guo Chengyu;Li Tianyi;Zhang Chi;Dai Chunduo;Zhang Zhe(State Key Laboratory of Metal Materials for Marine Equipment and Application,Anshan Liaoning 114009,China;Ansteel Beijing Research Institute Co.,Ltd.,Beijing 102200,China;Iron and Steel Rresearch Institutes of Ansteel,Anshan Liaoning 114009,China)

机构地区：[1]海洋装备用金属材料及其应用国家重点实验室,辽宁鞍山114009 [2]鞍钢集团北京研究院有限公司,北京102200 [3]鞍钢集团钢铁研究院,辽宁鞍山114009

出　　处：《金属热处理》2024年第11期46-52,共7页Heat Treatment of Metals

摘　　要：采用热力学计算以及扫描电镜、透射电镜等试验设备对热处理Q890高强钢的显微组织和析出相进行了研究。结果表明,淬火态试验钢的微观组织为板条马氏体+少量贝氏体+纳米(Nb,Ti)C和富Cu粒子,析出相平均尺寸为42.09 nm,体积分数为0.66%,析出强化分量为89.21 MPa;200℃低温回火后,试验钢的显微组织变化不大,析出相略微长大,析出强化分量降低;600℃高温回火后,试验钢的显微组织为回火索氏体+少量贝氏体+大量富Fe的M_(23)C_(6)粒子,析出相显著长大,平均尺寸为52.29 nm,体积分数为8.55%,析出强化分量显著提高,为271.08 MPa。Microstructure and precipitated phases of heat treated Q890 high strength steel were studied by using thermodynamic calculations and experimental equipment such as scanning electron microscope and transmission electron microscope.The results indicate that the microstructure of the quenched tested steel is lath martensite,a small amount of bainite,(Nb,Ti)C and Cu-rich nanoscale precipitated phase,the average size of precipitated phase is 42.09 nm,the volume fraction is 0.66%,and the precipitation strengthening component is 89.21 MPa.After low-temperature tempering at 200℃,the microstructure of the tested steel shows a little change,the precipitated phases grow slightly,and the precipitation strengthening component decreases.After high-temperature tempering at 600℃,the microstructure of the tested steel is tempered sorbite,a small amount of bainite and a large amount of Fe-rich M_(23)C_(6) precipitate phases.The precipitated phase particle size significantly increases,with average size of 52.29 nm and volume fraction of 8.55%.The precipitation strengthening component is significantly increased to 271.08 MPa.

关 键 词：Q890高强钢 热处理 析出相 显微组织 

分 类 号：TG156[金属学及工艺—热处理]