影响P91耐热钢焊缝金属冲击韧性的因素分析

doi:10.11896/cldb.22080097

材料导报

2024, Vol. 38

Issue (3): 22080097-5 https://doi.org/10.11896/cldb.22080097

金属与金属基复合材料

影响P91耐热钢焊缝金属冲击韧性的因素分析

李文清¹, 曹睿^1,*, 杨飞², 徐晓龙², 毛兴贵², 蒋勇², 闫英杰¹

1 兰州理工大学材料科学与工程学院,省部共建有色金属先进加工与再利用国家重点实验室,兰州 730050
2 四川大西洋焊接材料股份有限公司,四川自贡 643000

Analysis of Factors Affecting the Impact Toughness of P91 Heat-resistant Steel Weld Metal

LI Wenqing¹, CAO Rui^1,*, YANG Fei², XU Xionglong², MAO Xinggui², JIANG Yong², YAN Yingjie¹

1 The State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
2 Sichuan Atlantic Welding Materials Co., Ltd., Zigong 643000, Sichuan, China

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摘要利用扫描电镜、光学显微镜、X射线衍射仪、电解萃取实验等研究了P91耐热钢焊缝金属冲击韧性不稳定的原因。结果表明,焊缝金属的组织为铁素体组织,在铁素体基体与晶界处分布着大量的析出相。析出相主要为M₂₃C₆型碳化物和氧化物夹杂,其中晶界处聚集的M₂₃C₆是影响焊缝金属冲击韧性的主要原因。通过对不同冲击韧性值的试样晶界处碳化物的面积分数统计发现,M₂₃C₆面积分数的增加导致焊缝金属的冲击韧性下降。

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关键词: P91耐热钢冲击韧性 M₂₃C₆碳化物

Abstract: The reasons for the instability of the impact toughness of P91 heat-resistant steel weld metal were investigated by scanning electron microscope, optical microscope, X-ray diffraction and electrolytic extraction experiment. The results show that the microstructure of the weld metal is mainly composed of ferrite and a large number of precipitates distributed at the ferrite matrix and grain boundary. The precipitates mainly consist of M₂₃C₆ carbide and oxide inclusions, among which aggregated M₂₃C₆ is the main reason affecting the impact toughness of the weld metal. According to the statistics of the area fraction of carbides at grain boundaries for specimens with different impact toughness values, it is found that the increase of M₂₃C₆ area fraction leads to the decrease of the impact toughness of the weld metal.

Key words: P91 heat-resistant steel impact toughness M₂₃C₆ carbide

出版日期: 2024-02-10 发布日期: 2024-02-19

ZTFLH:

TG441

基金资助: 国家自然科学基金(52175325;51961024;52071170);甘肃省教育厅“双一流”科研重点项目(GSSYLXM-03)

通讯作者: *曹睿,博士,兰州理工大学教授、博士研究生导师。获得甘肃省飞天学者和四川省天府学者。2003年6月兰州理工大学材料科学与工程学院参加工作至今。主要从事新材料和异种材料的焊接性、强韧性、腐蚀、变形、损伤及断裂行为研究等科研工作。发表SCI检索论文90余篇,发表中文核心期刊论文120余篇,完成著作2部。完成国家自然科学基金项目、甘肃省科研项目以及企业合作项目40余项。caorui@lut.edu.cn

作者简介: 李文清,2020年6月毕业于兰州工业学院,获得工学学士学位,现为兰州理工大学材料科学与工程学院硕士研究生。在曹睿老师的指导下进行课题研究,目前研究领域主要为焊缝金属强韧化的研究。

引用本文:

李文清, 曹睿, 杨飞, 徐晓龙, 毛兴贵, 蒋勇, 闫英杰. 影响P91耐热钢焊缝金属冲击韧性的因素分析[J]. 材料导报, 2024, 38(3): 22080097-5.
LI Wenqing, CAO Rui, YANG Fei, XU Xionglong, MAO Xinggui, JIANG Yong, YAN Yingjie. Analysis of Factors Affecting the Impact Toughness of P91 Heat-resistant Steel Weld Metal. Materials Reports, 2024, 38(3): 22080097-5.

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http://www.mater-rep.com/CN/10.11896/cldb.22080097 或 http://www.mater-rep.com/CN/Y2024/V38/I3/22080097

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