摘要
为了解决托克马克核聚变装置D型线圈盒19Cr-17 Ni-5Mn-4Mo奥氏体不锈钢焊缝金属4.2 K超低温断裂韧性值偏低和不稳定的问题,通过使用不同的焊接线能量、焊道布置、道间温度和清洁度控制等条件下进行焊接试验,探索了这些焊接变数对焊缝金属超低温断裂韧性的影响规律;并采用金相分析、EBSD和断口电镜扫描等表征方法研究了微观组织与超低温断裂韧性内在关系,为优化焊接工艺提供了理论基础。研究结果表明:通过降低焊接线能量和层间温度来细化晶粒和减少析出相,及通过提高氩弧焊气保护质量、加强道间清理和优化焊道布置等措施来提高焊缝纯净度和均匀性等措施可以有效提高焊缝的低温断裂韧性。
In order to solve the problem of low and unstable fracture toughness of weld metal at 4.2 K cryogenic temperature of 19Cr-17 Ni-5Mn-4Mo austenitic stainless steel in D-coil box of Tokamak nuclear fusion device,welding test was performed under different welding heat input,weld bead layout,inter-pass temperature and cleanliness control,and the influence of those welding variables on the cryogenic temperature fracture toughness of weld metal were explored.The internal relationship between microstructure and cryogenic temperature fracture toughness was stud-ied by metallographic analysis,EBSD and fracture SEM,which provides a theoretical basis for optimizing welding process.The results show that the cryogenic temperature fracture toughness of weld metal can be effectively improved by lowing the welding heat input and inter-pass tempera-ture to refine the grain and reduce the precipitated phase,and by improving the quality of shielding gas protection of TIG welding,strengthening the inter-pass cleaning and optimizing the weld bead layout to improve the purity and uniformity of weld.
作者
吕映宾
徐旭美
张敏
刘劲
许杰
陈石磊
孙志远
方超
张茂龙
Lv Yingbin;Xu Xumei;Zhang Min;Liu Jin;Xu Jie;Chen Shilei;Sun Zhiyuan;Fang Chao;Zhang Maolong(Shanghai Electric Nuclear Power Equipment Co.,LTD.,Shanghai 201306,China;Shanghai Institute of Spacecraft Equipment,Shanghai 200240,China;Shanghai Electric Nuclear Power Group Co.,LTD.,Shanghai 201306,China;Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,China)
出处
《低温工程》
CAS
CSCD
北大核心
2024年第2期36-43,共8页
Cryogenics
基金
“十三五”国家重大科技基础设施项目和聚变堆主机关键系统综合研究设施项目(No.2018-000052-73-01-001228)。
关键词
奥氏体不锈钢
焊缝金属
超低温
断裂韧性
austenitic stainless steel
weld metal
cryogenic temperature
fracture toughness
