Microstructure Characterization of the Fusion Zone of an Alloy 600-82 Weld Joint
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2015年第10期
论文作者：Cheng Ma Jinna Mei Qunjia Peng Ping Deng En-Hou Han Wei Ke
文章页码：1011 - 1017
摘 要：Characterization of the microstructure of the fusion zone of an Alloy 600-82 weld joint was conducted,with focus on the weld residual strain distribution and the comparison of the microstructure of heat affected zone（HAZ） with that of cold worked alloy. Peak of the residual strain was observed to approach to the fusion boundary in HAZ while the strain increased from the top of the weld to the root. Strain distribution in the HAZ was found to be concentrated adjacent to grain boundaries（GBs）, with a peak of approximately three times of that in grain. Further, triple junctions of the GB appear to cause a higher strain concentration than single GBs. The microstructure of HAZ consists of partially tangled dislocations, which is different from slip bands of high density dislocations in cold worked alloy. This may cause a relatively higher intergranular cracking resistance of HAZ due to the difficulty in transferring tangled dislocations to GB in HAZ under deformation.
Cheng Ma1，Jinna Mei2，Qunjia Peng1，Ping Deng1，En-Hou Han1，Wei Ke1
1. Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences2. Suzhou Nuclear Power Research Institute
摘 要：Characterization of the microstructure of the fusion zone of an Alloy 600-82 weld joint was conducted,with focus on the weld residual strain distribution and the comparison of the microstructure of heat affected zone（HAZ） with that of cold worked alloy. Peak of the residual strain was observed to approach to the fusion boundary in HAZ while the strain increased from the top of the weld to the root. Strain distribution in the HAZ was found to be concentrated adjacent to grain boundaries（GBs）, with a peak of approximately three times of that in grain. Further, triple junctions of the GB appear to cause a higher strain concentration than single GBs. The microstructure of HAZ consists of partially tangled dislocations, which is different from slip bands of high density dislocations in cold worked alloy. This may cause a relatively higher intergranular cracking resistance of HAZ due to the difficulty in transferring tangled dislocations to GB in HAZ under deformation.
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