Effect of Post-Weld Heat-Treatment on Residual Stress of 20G Steel Welded Joint

CHEN Shuming; WANG Haiyan; YAO Zhaofeng; GAO Shiyi; FANG Weiping

doi:10.11973/jxgccl201710002

Materials and Mechanical Engineering > 2017 > 41(10): 7-10,57. > DOI: 10.11973/jxgccl201710002

CHEN Shuming, WANG Haiyan, YAO Zhaofeng, GAO Shiyi, FANG Weiping. Effect of Post-Weld Heat-Treatment on Residual Stress of 20G Steel Welded Joint[J]. Materials and Mechanical Engineering, 2017, 41(10): 7-10,57. DOI: 10.11973/jxgccl201710002

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Effect of Post-Weld Heat-Treatment on Residual Stress of 20G Steel Welded Joint

1. Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resource, Inner Mongolia University of Science and Technology, Baotou 014010, China;
2. School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China;
3. Key Laboratory of Modern Welding Technology of Guangdong Province, Guangdong General Research Institute for Industrial Technology, Guangzhou 510650, China

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Received Date: December 26, 2016
Revised Date: August 20, 2017

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Surface residual stresses and micro-residual stresses in 20G steel welded joint before and after heat-treatment were studied by X-ray stress analyzer and electron backscattered diffractometer (EBSD), respectively. The results show that the surface residual stresses distributed symmetrically along the weld center and decreased with increasing distance from the weld center. The average residual stress of the joint after heat-treatment was lower by 7.21% than that before heat-treatment. After heat-treatment, the recrystallization of the grains occurred in the weld zone, heated affected zone and base metal of the welded joint, resulting in the refinement of the grains. The kernel average misorientation values decreased, and the micro-residual stresses were released and distributed evenly due to the recrystallization. However, the micro-residual stresses in the weld zone were still relatively high.
- 20G steel,
- post-weld heat-treatment,
- residual stress

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