CAUSE ANALYSIS OF RUPTURE FAILURE OCCURRED ON WELD JOINTS OF DISSIMILAR STEELS USED ON REHEATERS

WU Shideng1; GAO Yan2; PAN Rongxuan11.Guangdong Electric Power Research Institute

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CAUSE ANALYSIS OF RUPTURE FAILURE OCCURRED ON WELD JOINTS OF DISSIMILAR STEELS USED ON REHEATERS

Thermal Power Generation Vol. 40, Issue 2, Pages: 91-93(2011)

更新时间：2025-09-28

- CAUSE ANALYSIS OF RUPTURE FAILURE OCCURRED ON WELD JOINTS OF DISSIMILAR STEELS USED ON REHEATERS
- 作者机构：
  
  1. 广东电网公司电力科学研究院
  2. 华南理工大学机械工程学院
- 作者简介：
- 基金信息：
- DOI：
  CLC： TG441.7
- Published：2011
- 稿件说明：
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WU Shideng1, GAO Yan2, PAN Rongxuan11.Guangdong Electric Power Research Institute. CAUSE ANALYSIS OF RUPTURE FAILURE OCCURRED ON WELD JOINTS OF DISSIMILAR STEELS USED ON REHEATERS[J]. Thermal Power Generation, 2011, 40(2): 91-93.
DOI：

WU Shideng1, GAO Yan2, PAN Rongxuan11.Guangdong Electric Power Research Institute. CAUSE ANALYSIS OF RUPTURE FAILURE OCCURRED ON WELD JOINTS OF DISSIMILAR STEELS USED ON REHEATERS[J]. Thermal Power Generation, 2011, 40(2): 91-93. DOI：

摘要

通过宏观检查、拉伸试验、金相显微组织分析

对锅炉后屏再热器12Cr1MoV钢与TP304H奥氏体钢异种钢接头泄漏原因进行了分析。结果表明

12Cr1MoV侧熔合区为接头的脆化和断裂薄弱区

熔合线上的富碳层和楔形缺陷导致焊缝形成裂纹而泄漏。另外

12Cr1MoV和奥氏体钢焊缝金属线膨胀系数差别很大

在焊缝界面附近出现的明显热应力对裂纹的形成有一定的促进作用。

Abstract

Through macroscopic inspection

tensile test

and metallographic microstructure analysis

the causes leading to leakage on weld joints of dissimilar steels

i.e.12Cr1MoV steel and TP304H austenitic steel

have been analysed.The results show that the fussion zone at 12Cr1MoV steel side is the weak zone for enbrittlement and rupture of the weld joints

the carbon-enriched layer and the wedge-shaped defects on the fussion line lead to crack in the weld joints

resulting in leakage.In addition

the linear expansion coefficient of two said steels in the weld joints has very large difference

the obvious thermal stress appeared in the vicinity of interface in the weld joints has promoting effect for cracking.

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