Microstructure and properties of Inconel 690/321 stainless steel dissimilar metal welded joint

Inconel 690/321不锈钢异种金属焊接接头组织与性能研究 Microstructure and properties of Inconel 690/321 stainless steel dissimilar metal welded joint 黄卫东 HUNAG Weidong 1 first-author 伍建文 WU Jianwen 1 芦丽莉 LU Lili 1 潘学荣 PAN Xuerong 1 中国核动力研究设计院反应堆燃料及材料重点实验室 中国核动力研究设计院反应堆燃料及材料重点实验室 Reactor Fuel and Materials Key Laboratory,Nuclear Power Institute of China Reactor Fuel and Materials Key Laboratory,Nuclear Power Institute of China 针对Inconel 690/321不锈钢异种金属多层多道焊接中可能出现裂纹、未焊透、未熔合等缺陷,并伴随出现劣化组织,导致接头性能降低的问题,通过金相组织分析、化学成分分析和显微硬度测试,开展了异种金属焊接接头组织与性能研究。结果表明:各区域均为正常的焊接组织,无明显的焊接缺陷,劣化区中有TiC,但接头硬度整体偏低,塑性良好;在多层多道焊过程中,后道层对前道层焊缝区的回火作用改善了组织,性能未受明显影响。 In the multi-layer and multi-pass welding of Inconel 690/321 stainless steel dissimilar metals,cracks,incomplete penetration,incomplete fusion and other defects may occur,accompanied by deterioration structure,resulting in the degradation of joint performance. In view of the above problems,the microstructure and properties of dissimilar metal welded joints are studied by means of metallographic structure analysis,chemical composition analysis and microhardness test.The results show that there is normal welding microstructure in each region and no obvious welding defects;there is TiC in degradation zone,the hardness of welded joint is generally low,but has good plasticity;in the multi-layer and multi-pass welding process,the tempering effect of the latter layer on the weld metal zone of the former layer improves the microstructure and the performance is not significantly affected. Inconel 690 321不锈钢 异种金属焊接 组织 性能 Inconel 690 321 stainless steel dissimilar metal welding microstructure properties TG407 2022-03-08 7 50