Microstructure evolution and mechanical properties of 316H weld metal during aging |
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| Authors: | Shitong Wei Langlang Zhao Dianbao Gao |
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| Affiliation: | 1. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, People’s Republic of China;2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, People’s Republic of China;3. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, People’s Republic of China;4. Nuclear Power and Petro-chemical Business Group, China First Heavy Industries, Dalian, People’s Republic of China |
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| Abstract: | ABSTRACTA standard 316H welding wire was used to obtain 6% δ-ferrite in the weld metal by the automatic tungsten inert gas welding. The effect of aging time at 750°C on microstructure and mechanical properties of the weld metal were analysed. The results showed that as the aging time increased, the δ-ferrite fraction decreased, and finally, δ-ferrite was no longer seen, the M23C6 fraction first increased and then decreased, and the σ phase fraction increased. Finally, the fractions of M23C6 and σ phase kept stable, but the size increased. Accordingly, as the aging time increased, the yield and tensile strengths first decreased significantly, then increased obviously and finally decreased slightly again, while the elongation and impact energy decreased all the time. |
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| Keywords: | Tungsten inert gas welding aging treatment δ-ferrite M23C6 σ phase mechanical property |
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