[1]范志東,都勁松,張志博,等.超超臨界鍋爐再熱器12Cr1MoVG管焊縫失效研究[J].中國材料進展,2019,(06):614-619.[doi:10.7502/j.issn.1674-3962.201712020]
FAN Zhidong,DU Jingsong,ZHANG Zhibo,et al.Failure Mechanism of 12Cr1MoVG Tubes from Reheater in an Ultra-Supercritical Boiler[J].MATERIALS CHINA,2019,(06):614-619.[doi:10.7502/j.issn.1674-3962.201712020]
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超超臨界鍋爐再熱器12Cr1MoVG管焊縫失效研究(
)
中國材料進展[ISSN:1674-3962/CN:61-1473/TG]
- 卷:
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- 期數:
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2019年第06期
- 頁碼:
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614-619
- 欄目:
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研究報告
- 出版日期:
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2019-06-30
文章信息/Info
- Title:
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Failure Mechanism of 12Cr1MoVG Tubes from Reheater in an Ultra-Supercritical Boiler
- 作者:
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范志東1; 都勁松1; 張志博1; 田進2; 馬翼超1; 牛坤1; 郭衛銓1; 劉承鑫1
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1，西安熱工研究院有限公司 2，西安交通大學 金屬材料強度國家重點實驗室
- Author(s):
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FAN Zhidong1; DU Jingsong1; ZHANG Zhibo1; TIAN Jin2; MA Yichao1; NIU Kun1; GUO Weiquan1; LIU Chengxin1
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(1Xian Thermal Power Research Institute Co., Ltd., (2State Key Laboratory for Mechanical Behavior of Materials, Xian Jiaotong University,
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- 關鍵詞:
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12Cr1MoVG; 再熱裂紋; 失效分析; 焊縫
- Keywords:
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12Cr1MoVG; reheating crack; failure analysis; welding
- DOI:
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10.7502/j.issn.1674-3962.201712020
- 文獻標志碼:
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A
- 摘要:
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通過顯微組織分析、化學成分分析、裂紋形貌觀察和焊接工藝分析，對某超超臨界鍋爐再熱器小徑厚壁管12Cr1MoVG鋼焊縫接頭裂紋進行了失效分析。結果表明：裂紋沿周向分布，起始于焊縫的熱影響區粗晶區，向細晶區擴展，并呈沿晶擴展特征；在裂紋區域可見宏觀裂紋、微裂紋和孔洞。根據裂紋產生的位置和形貌、焊縫顯微組織等特征，確定該裂紋為焊接再熱裂紋。失效原因為焊縫焊接質量差：焊縫各區域硬度值均超過標準規范范圍上限值，表明焊縫內有較大的殘余應力；焊縫晶粒粗大，導致晶粒間變形協調性大幅降低。
- Abstract:
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For any plant, it is very important to generate electricity without forced outages. Failure of boiler tubes is the major concern of forced outages at the coalfired thermal power plant, especially at ultra-supercritical units. 12Cr1MoV steel has been widely used as tubes in the ultra-supercritical boiler. Cause of the failed reheater tube joint of 12Cr1MoVG steel was studied by chemical composition test, microstructure analysis, crack morphology observation，joint structure, hardness, and welding qualities analysis. The results show that the crack initiated from coarse grain heat affect zone (HAZ) along with the circumferential distribution, and propagated along grain boundaries. There are macrocracks，microcracks and voids in the cracking region．According to the microstructure，position，process and fractography analyses of the cracks，it is concluded to be the weld reheat cracking. The failure of the tube is mainly due to bad welding quality, characterized by high residual stress, coarsened grain size, and so on. Formation of intergranular cavity and microcrack is shortened by high residual stress and is easier due to plastic-deformation disharmony between coarse grains.
更新日期/Last Update:
2019-07-10