电站中超期服役10CrMo910钢的高温蠕变行为  

High Temperature Creep Behavior of Overage Serviced 10CrMo910 Steel for Power Station

作　　者：高悦敏 杜好阳[1] 叶丰[2] 崔伦[1] GAO Yuemin;DU Haoyang;YE Feng;CUI Lun(State Grid Jilin Electric Power Research Institute,Changchun 130021,China;State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]吉林省电力科学研究院有限公司,长春130021 [2]北京科技大学新金属材料国家重点实验室,北京100083

出　　处：《机械工程材料》2022年第4期69-74,共6页Materials For Mechanical Engineering

基　　金：吉林省电力科学研究院有限公司科技资助项目(KY-GS-20-01-03)。

摘　　要：对某热电厂机组中运行2×10^(5)h以上的主蒸汽管道用10CrMo910钢进行不同温度(535,560,580℃)的高温蠕变试验,研究该钢的高温蠕变行为及组织演变过程。结果表明:不同温度高温蠕变后,超期服役10CrMo910钢的晶粒发生了明显变形,贝氏体和铁素体基体中都发生了再结晶,析出相粗化,蠕变孔洞变大变深,蠕变损伤加重;随着蠕变温度的升高,蠕变断裂时间从4 633 h降低到2 314 h,高温蠕变断裂强度从87.7 MPa降低到58.3 MPa, 10CrMo910钢的高温蠕变性能降低;蠕变断口为韧窝状,无明显的剪切撕裂区,可见明显的二次裂纹和析出相,断裂方式均为准解理断裂。The high temperature creep tests at different temperatures(535,560,580 ℃) were conducted on 10 CrMo910 steel main steam pipe for generator unit in a thermal power station, which had been running for more than 2×10^(5) h, and the high temperature creep behavior and microstructure evolution of the steel were studied. The results show that after high temperature creep at different temperatures, the grains of overage serviced 10 CrMo910 steel were obviously deformed, recrystallization occurred in bainite and ferrite matrix, and precipitates coarsened;creep holes became larger and deeper, and creep damage was aggravated. With increasing creep temperature, the creep fracture time decreased from 4 633 h to 2 314 h, and the high temperature creep rupture strength decreased from 87.7 MPa to 58.3 MPa, indicating the high temperature creep property of 10 CrMo910 steel decreased. The creep fracture was dimple-like without obvious shear tear zone and with obvious secondary cracks and precipitates, and the fracture mode was quasi cleavage fracture.

关 键 词：10CRMO910钢 超期服役 主蒸汽管道 高温蠕变 析出相 蠕变孔洞 

分 类 号：TG142.1[一般工业技术—材料科学与工程]