Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第23卷    第2期    总第167期    2013年2月

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文章编号:1004-0609(2013)02-0396-07
T92/Super304H异种钢焊接接头的组织结构和力学性能
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。

 

关键字: T92钢;Super304H钢;异种钢焊接接头;微观组织;力学性能

Microstructures and mechanical properties of T92/Super304H dissimilar steel weld joints
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

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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