压力容器2025，Vol.42Issue(10)：23-30,8.DOI:10.3969/j.issn.1001-4837.2025.10.002
道间温度对镍基690焊丝熔敷金属组织及性能影响研究
Study on the influence of interpass temperature on microstructure and properties of nickel-based 690 welding wire deposited metal
冯伟 1孟涵 2韩兴海 1陈波 1王国佛1
作者信息
- 1. 哈尔滨威尔焊接有限责任公司,哈尔滨 150060
- 2. 哈尔滨威尔焊接有限责任公司,哈尔滨 150060||中国机械总院集团哈尔滨焊接研究所有限公司,哈尔滨 150028
- 折叠
摘要
Abstract
To address the issue of inconsistent interpass temperatures during welding of nuclear island main equipment components,the TIG welding method was used to study the influence of interpass temperature on the microstructure evolution and mechanical properties of nickel-based 690 welding wire deposited metal.Combined with mechanical property tests such as tensile and impact,as well as microstructural observations using OM,SEM and EDS,the results show that as the interpass temperature increases,the room-temperature mechanical properties of the deposited metal improve insignificantly,but both strength and plasticity at 350℃are enhanced.With increasing interpass temperature,the weld formation coefficient decreases,while the fluidity of the molten pool and weldability improve significantly,and the high-temperature heat accumulation effect intensifies,promoting molten pool flow and grain boundary migration,thereby increasing the orientation regularity of columnar grains in the overlapping zone across weld passes.When the interpass temperature exceeds 225℃,microcracks are prone to form in the microstructure.SEM and EDS analyses reveal that these cracks exhibit step-like propagation morphology,accompanied by O/Si element enrichment and Ti/Nb element segregation,consistent with the characteristics of ductility-dip cracking(DDC).This study provides a reference for establishing reasonable interpass temperature processes in nuclear power equipment welding.关键词
Inconel 690/热裂纹/道间温度/高温低塑性裂纹(DDC)Key words
Inconel 690/hot cracking/interpass temperature/ductility-dip cracking(DDC)分类
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冯伟,孟涵,韩兴海,陈波,王国佛..道间温度对镍基690焊丝熔敷金属组织及性能影响研究[J].压力容器,2025,42(10):23-30,8.
