铁基合金堆焊层裂纹原因分析及工艺改进

朱伟; 高俊根; 孔永红; 朱建雄; 吴金龙; 朱勃; 张玉庆

doi:10.7512/j.issn.1001-2303.2021.11.23

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铁基合金堆焊层裂纹原因分析及工艺改进
Analysis and improvement of cracking in ironbase alloy hardfacing layer
2021年51卷第11期页码：122-127
DOI： 10.7512/j.issn.1001-2303.2021.11.23

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朱伟, 高俊根, 孔永红, 等. 铁基合金堆焊层裂纹原因分析及工艺改进[J]. 电焊机, 2021,51(11):122-127.

ZHU Wei, GAO Jungen, KONG Yong hong, et al. Analysis and improvement of cracking in ironbase alloy hardfacing layer[J]. 2021,51(11):122-127.
朱伟, 高俊根, 孔永红, 等. 铁基合金堆焊层裂纹原因分析及工艺改进[J]. 电焊机, 2021,51(11):122-127. DOI： 10.7512/j.issn.1001-2303.2021.11.23.

ZHU Wei, GAO Jungen, KONG Yong hong, et al. Analysis and improvement of cracking in ironbase alloy hardfacing layer[J]. 2021,51(11):122-127. DOI： 10.7512/j.issn.1001-2303.2021.11.23.

摘要

某核电项目现场在安装和调试工作结束后,发现某国外阀门厂制造的批量阀门的阀座、阀瓣等零件的铁基合金堆焊表面有裂纹和开裂的情况。在对典型裂纹零件进行系统性的分析和检测后,确定了堆焊层裂纹原因为:铁基合金堆焊及后续加工过程中易产生微观缺陷(如树枝状空腔)、加工毛刺、尖锐缺口等裂纹源。通过优化堆焊零件结构和堆焊工艺(增加预热或提高预热温度、焊后热处理等)后,能够有效降低焊缝中的残余应力,现场反馈改进效果良好,为后续核电项目硬质合金堆焊零件制造、加工和检验提供了借鉴。

Abstract

After installation and commissioning, cracks were found in the iron-base alloy hard-faced sealing surface and the iron-base alloy hard-faced guide surface of bulk imported valve parts from a foreign valve manufacturer. After systematic analysis and testing of the typical crack-containing parts, the root cause of the weld cracks was determined and summarized. After optimizing the structure of the hard face layer and the hard-facing progress, the replacement valve parts have been proven have better crack resistance and anti-expansion ability. Above all, this provides an engineering reference for the iron-based alloy welding in nuclear power equipment applications.