T92/Super304H异种钢焊接接头的组织结构和力学性能
来源期刊：中国有色金属学报2013年第2期
论文作者：张祺 王家庆 陈国宏 刘俊建 化建 余新海 张涛 张建华 汤文明
文章页码：396 - 403
关键词：T92钢；Super304H钢；异种钢焊接接头；微观组织；力学性能
Key words：T92 steel; Super304H steel; dissimilar steel weld joint; microstructure; mechanical properties
摘 要：采用钨极氩弧焊(GTAW)技术，采用ERNiCr-3和ERNiCrMo-3两种镍基焊丝实施T92/Super304H异种钢焊接，并对接头的显微组织结构及力学性能进行测试分析。结果表明：T92侧热影响区(HAZ) 中粗晶区析出大量的第二相颗粒，细晶区则为细小的索氏体组织；Super304H侧 HAZ奥氏体晶粒长大，晶界析出明显；ERNiCr-3焊接的焊缝组织呈胞状结构，晶粒粗大；ERNiCrMo-3焊接的焊缝组织呈柱状晶组织特征。ERNiCrMo-3焊接的接头强度、塑性及硬度较大，拉伸断裂位于Super304H母材；而ERNiCr-3焊接的接头强度、硬度较低，但冲击韧性较高，拉伸断裂位于焊缝。
Abstract: T92/Super304H dissimilar steel joints were produced through gas tungsten arc welding (GTAW) technique, using two Ni-based welding wires of ERNiCr-3 and ERNiCrMo-3, respectively. The microstructures and mechanical properties of the joints were then studied. The results show that in the heat-affected zone (HAZ) of the T92 side, lots of second-phase particles precipitate along the grain boundaries and inside the grains of the prior austenites. The fine grain zone of the T92 side HAZ is of a sorbite structure. In the Super304H side HAZ, the austenitic grains grow up rapidly with lots of precipitates along the grain boundaries. The ERNiCr-3 welding seam in the joint is of a coarse cellular structure. Comparatively, the ERNiCrMo-3 welding seam is of dense columnar grains. The ERNiCrMo-3 welded joints have higher strength, ductility and hardness, however, the ERNiCr-3 welded joints have a higher impact toughness value. Moreover, the tensile fracture of the formers takes place in the Super304H base metal, while that of the latters happens in the welding seam.
张 祺1，王家庆2，陈国宏2，刘俊建2，化 建3，余新海3，张 涛2，张建华1，汤文明1
(1. 合肥工业大学 材料科学与工程学院，合肥 230009；
2. 安徽省电力科学研究院，合肥 230601；
3. 合肥津利能源科技发展有限公司，合肥 230601)
摘 要：采用钨极氩弧焊(GTAW)技术，采用ERNiCr-3和ERNiCrMo-3两种镍基焊丝实施T92/Super304H异种钢焊接，并对接头的显微组织结构及力学性能进行测试分析。结果表明：T92侧热影响区(HAZ) 中粗晶区析出大量的第二相颗粒，细晶区则为细小的索氏体组织；Super304H侧 HAZ奥氏体晶粒长大，晶界析出明显；ERNiCr-3焊接的焊缝组织呈胞状结构，晶粒粗大；ERNiCrMo-3焊接的焊缝组织呈柱状晶组织特征。ERNiCrMo-3焊接的接头强度、塑性及硬度较大，拉伸断裂位于Super304H母材；而ERNiCr-3焊接的接头强度、硬度较低，但冲击韧性较高，拉伸断裂位于焊缝。
关键词：T92钢；Super304H钢；异种钢焊接接头；微观组织；力学性能
ZHANG Qi1, WANG Jia-qing2, CHEN Guo-hong2, LIU Jun-jian2, HUA Jian3, YU Xin-hai3, ZHANG Tao2, ZHANG Jian-hua1,
(1. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China;
2. Anhui Institute of Electric Power Science, Hefei 230601, China;
3. Hefei Jinli Power S)
Abstract:T92/Super304H dissimilar steel joints were produced through gas tungsten arc welding (GTAW) technique, using two Ni-based welding wires of ERNiCr-3 and ERNiCrMo-3, respectively. The microstructures and mechanical properties of the joints were then studied. The results show that in the heat-affected zone (HAZ) of the T92 side, lots of second-phase particles precipitate along the grain boundaries and inside the grains of the prior austenites. The fine grain zone of the T92 side HAZ is of a sorbite structure. In the Super304H side HAZ, the austenitic grains grow up rapidly with lots of precipitates along the grain boundaries. The ERNiCr-3 welding seam in the joint is of a coarse cellular structure. Comparatively, the ERNiCrMo-3 welding seam is of dense columnar grains. The ERNiCrMo-3 welded joints have higher strength, ductility and hardness, however, the ERNiCr-3 welded joints have a higher impact toughness value. Moreover, the tensile fracture of the formers takes place in the Super304H base metal, while that of the latters happens in the welding seam.
Key words:T92 steel; Super304H steel; dissimilar steel weld joint; microstructure; mechanical properties
