电焊机2025，Vol.55Issue(6)：147-154,8.DOI:10.7512/j.issn.1001-2303.2025.06.20
亚临界锅炉T91钢/TP304H异种钢焊接接头长时服役的性能研究
Performance evaluation of T91/TP304H steel welded joints in subcritical boilers after long-time operation
王庆 1孙震兆 2李泽芝 2郭晓轩 2杨云昊 2费丽伟 2赵平2
作者信息
- 1. 四川广安发电有限责任公司,四川 广安 638500
- 2. 青岛科技大学 材料科学与工程学院,山东 青岛 266042
- 折叠
摘要
Abstract
For the dissimilar steel welding joint of T91/TP304H subcritical boiler superheater pipes that have been in opera-tion for nearly 93,000 hours,systematic microstructure observation,mechanical property testing,and creep rupture perfor-mance analysis were carried out using instruments and equipment such as metallographic microscope,Vickers hardness tes-ter,universal testing machine,and scanning electron microscope.The study found that after long-term high-temperature ser-vice,the tissues of both T91 and TP304H steel pipe samples showed significant aging characteristics.Specifically,on the T91 side,M23C6 phase,Laves phase,and MX phase precipitated at the grain boundaries,while on the TP304H side,Cr-rich M23C6 phase precipitated at the grain boundaries.The aging levels of the joint tissues were both between 3 to 3.5.The frac-ture locations of the high-temperature tensile test and the creep rupture test were both near the fusion line on the T91 side,in-dicating that this area is the weak zone of the joint.Moreover,through the temperature curve extrapolation method,the esti-mated residual life of the T91 side was calculated to be 55,000 hours,while that of the TP304H side was 50,500 hours.How-ever,the overall performance of the joint has deteriorated,and its reliability for safe operation has decreased.关键词
T91/TP304H异种钢焊接接头/长时服役/微观组织老化/力学性能衰退/剩余寿命预测Key words
dissimilar steel joints/T91/TP304H/residual life分类
金属材料引用本文复制引用
王庆,孙震兆,李泽芝,郭晓轩,杨云昊,费丽伟,赵平..亚临界锅炉T91钢/TP304H异种钢焊接接头长时服役的性能研究[J].电焊机,2025,55(6):147-154,8.
