Performance Analysis and Residual Life Assessment of T22/TP304H Dissimilar Steel Welded Joints

SUN Jian; ZHU Yi; LIU Qing; LIU Fuguang; LIN He; LIU Hui; CHENG Xiaole

doi:10.7512/j.issn.1001-2303.2024.06.01

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Performance Analysis and Residual Life Assessment of T22/TP304H Dissimilar Steel Welded Joints
Vol. 54, Issue 6, Pages: 1-6(2024)
Received：12 July 2023，

Revised：2023-11-10，

Published：25 June 2024
DOI： 10.7512/j.issn.1001-2303.2024.06.01
稿件说明：

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孙戬，朱毅，刘清，等.T22/TP304H异种钢焊接接头性能分析与剩余寿命评估［J］.电焊机，2024，54（6）：1-6. DOI： 10.7512/j.issn.1001-2303.2024.06.01.

SUN Jian, ZHU Yi, LIU Qing, et al.Performance Analysis and Residual Life Assessment of T22/TP304H Dissimilar Steel Welded Joints[J].Electric Welding Machine, 2024, 54(6): 1-6. DOI： 10.7512/j.issn.1001-2303.2024.06.01.

摘要

异种钢焊接在亚临界锅炉中被广泛运用，其焊接接头性能会直接影响锅炉的运行安全和服役寿命。针对已服役20万小时以上的锅炉中带垫板T22/TP304H异种钢焊接接头，采用微观组织观察、常温与高温拉伸试验以及高温持久试验等方法，全面评估了焊接接头的组织形态、力学性能和耐久性。结果表明，TP304H母材及焊缝中有析出物聚集现象，易诱发焊接区域萌生裂纹；长期服役的接头拉伸强度低于ASME标准要求的最低值，力学性能出现较大程度的衰退；通过温度曲线推算法估算，焊接接头的剩余寿命为29 745 h，但其运行可靠性已显著降低，应对接头部位进行检修并加强后期巡检工作。该研究可为T22/TP304H异种钢焊接头的组织与性能研究和设备后续的安全运行提供理论参考。

Abstract

Dissimilar steel welding is extensively applied in subcritical boilers

where the performance of the welded joint directly impacts the boiler's operational safety and service life. This study focuses on the T22/TP304H dissimilar steel welded joint in boilers that have been in service for over 200 000 hours

analyzing the changes in its microstructure morphology and mechanical properties. The residual life of the joint is evaluated based on high-temperature endurance test results. Findings indicate that precipitate aggregation occurs in the TP304H base material and weld

which can easily induce the initiation of cracks in the welding area. The tensile strength of long-term operational joint samples is consistently lower than the minimum value required by ASME standards

indicating a significant decline in mechanical performance. The remaining life of the joint is 29 745 hours

but its operational reliability has significantly decreased. Thus

it is recommended to inspect and repair the joint area and intensify subsequent inspection work. This paper provides a theoretical reference for the study of T22/TP304H dissimilar steel welded joint structure and properties

and the safe operation of the equipment in the future.

关键词

Keywords

references

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