高温长期服役S30432钢管的组织与性能  

Microstructure and properties of S30432 steel tube after long-term service at high temperature

作　　者：杨希锐 江宝世 胡锋涛 李艳军 盛超杰 王晨 Yang Xirui;Jiang Baoshi;Hu Fengtao;Li Yanjun;Sheng Chaojie;Wang Chen(Rundian Energy Science and Technology Co.,Ltd,Zhengzhou Henan 450000,China;China Resources Power Heze Regional Company,Heze Shandong 274000,China;School of Power and Machinery,Wuhan University,Wuhan Hubei 430000,China)

机构地区：[1]润电能源科学技术有限公司,河南郑州450000 [2]华润电力菏泽有限公司,山东菏泽274000 [3]武汉大学动力与机械学院,湖北武汉430000

出　　处：《金属热处理》2024年第5期17-22,共6页Heat Treatment of Metals

摘　　要：通过室温拉伸、室温冲击、硬度测试、高温拉伸、金相显微镜、扫描电镜和能谱仪等手段研究了超超临界锅炉服役79000 h S30432钢管的组织和性能。结果表明,S30432钢管高温服役79000 h后,室温硬度和抗拉强度升高,塑、韧性均显著降低,断后伸长率已低于标准要求;高温下抗拉强度和塑性显著降低,670℃抗拉强度已低于标准外推值;组织严重老化,孪晶消失,除NbC、M_(23)C_(6)等碳化物外,晶内、晶界均不同程度析出了硬脆的σ相,是导致塑、韧性及高温抗拉强度大幅下降的主要原因。Microstructure and mechanical properties of the S30432 steel tube after high temperature service for 79000 h in ultra supercritical units were studied by means of room temperature tensile and impact test,hardness test,high temperature tensile test,metallographic microscope,scanning electron microscope and energy dispersive spectrometer.The results show that the room temperature hardness and tensile strength of the 79000 h long-term serviced S30432 steel tube increase,while the plasticity and toughness significantly decrease,the elongation is lower than the standard requirement.The tensile strength and plasticity at high temperature significantly decrease,and the tensile strength at 670℃is lower than the standard extrapolation value.The microstructure of the tube material is seriously aged,and the twins disappear.Except for carbides such as NbC and M_(23)C_(6),σphases precipitate to varying degrees in the grain or at the grain boundary,which is the main reason for the significant decrease in plasticity,toughness and high temperature tensile strength.

关 键 词：S30432钢 高温长时服役 组织 Σ相 力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]