淬火温度对690 MPa 级低焊接裂纹敏感性容器钢组织性能的影响  

Effect of quenching temperature on microstructure and properties of 690 MPagrade steel for pressure vessels with low welding crack sensitivity

作　　者：刘晨希 胡昕明 欧阳鑫 邢梦楠 王储 Liu Chenxi;Hu Xinming;Ouyang Xin;Xing Mengnan;Wang Chu(State Key Laboratory of Metal Material for Marine Equipment and Application,Anshan Liaoning 114009,China;Iron and Steel Research Institute of Angang Group,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]鞍钢集团钢铁研究院,辽宁鞍山114009

出　　处：《金属热处理》2024年第5期124-129,共6页Heat Treatment of Metals

摘　　要：通过光学显微镜、扫描电镜、高温共聚焦显微镜、电子拉伸试验机和全自动冲击试验机研究了不同淬火温度下690 MPa级低焊接裂纹敏感性压力容器用钢的组织演变及力学性能。结果表明,所设计化学成分的试验钢轧后进行820~970℃的淬火处理后,试验钢组织主要由粒状贝氏体、板条贝氏体和铁素体组成;在高温共聚焦显微镜下观察到970℃淬火过程中,试验钢降温至520℃时,部分晶粒开始以切变形式进行转变,生成板条贝氏体;试验钢经调质处理后,受组织遗传性影响,部分淬火组织未分解被保留下来。当淬火温度升至950℃以上,调质态试验钢的强度能够达到690 MPa级别。Microstructure evolution and mechanical properties of a 690 MPa grade pressure vessel steel with low welding crack sensitivity at different quenching temperatures were studied by means of optical microscope,scanning electron microscope,high-temperature confocal microscope,electronic tensile testing machine and fully automatic impact testing machine.The results show that the microstructure of the designed tested steel is mainly composed of granular bainite,lath bainite and ferrite after rolling and quenching at 820-970℃.Under a hightemperature confocal microscope,it is observed that during the quenching process at 970℃,when the temperature drops to 520℃,some grains begin to undergo shear transformation and form lath bainite.After quenching and tempering,part of the quenched microstructure is retained due to the genetic effect of the microstructure.When the quenching temperature rises to above 950℃,the strength level of the quenched and tempered tested steel can reach 690 MPa grade.

关 键 词：淬火温度 压力容器用钢 高温共聚焦显微镜 贝氏体 性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]