Fracture analysis for dissimilar metal welded joints of 12Cr1MoVG/TP347H in a utility boiler

ZHANG Zonglai

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Fracture analysis for dissimilar metal welded joints of 12Cr1MoVG/TP347H in a utility boiler

Thermal Power Generation Issue 4, (2017)

更新时间：2025-09-28

- Fracture analysis for dissimilar metal welded joints of 12Cr1MoVG/TP347H in a utility boiler
- 作者机构：
  
  神华国能集团有限公司,北京,100033
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK442
- Published Online：26 April 2017，
  
  Published：2017
- 稿件说明：
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ZHANG Zonglai. Fracture analysis for dissimilar metal welded joints of 12Cr1MoVG/TP347H in a utility boiler[J]. Thermal Power Generation, 2017, (4).
DOI：

ZHANG Zonglai. Fracture analysis for dissimilar metal welded joints of 12Cr1MoVG/TP347H in a utility boiler[J]. Thermal Power Generation, 2017, (4). DOI：

摘要

某电站锅炉高温再热器进口管12Cr1MoVG/TP347H接头运行1.7万h发生断裂，断裂发生在12Cr1MoVG侧焊缝熔合线处，对该管断口处经过成分分析、力学性能试验、金相组织检验，结果表明：母材的成分、强度、塑性、硬度等均满足相关标准要求；管段母材和热影响区金相组织未发现异常；焊缝的主要成分未见异常；焊缝宏观无明显的台阶和塑性变形，为脆性断口特征。认为该接头断裂为典型的A/P类异种钢接头早期失效，该接头早期失效断裂主要由于接头两侧母材运行中产生脆化层和软化层

力学性能差异导致的三轴拉应力所致，在接头焊接工艺中焊缝成形不良，接头坡口设计不合理、结构突变大（如焊瘤、背凸过大等）导致的应力集中促进了该接头早期失效。

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