Journal
MATERIALS SCIENCE AND TECHNOLOGY
Volume 33, Issue 14, Pages 1601-1609Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02670836.2017.1299277
Keywords
Layered ultrasonic impact treatment; thick weld joint; microstructure; hardness; welding residual stress
Funding
- National Natural Science Foundation of China [51575251]
- Jiangsu Government Scholarship for Overseas Studies [JS-2014-168]
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Layered ultrasonic impact treatment (LUIT) was used on V-groove welds in 55mm Q345 steel plate. Two welds were prepared, one by conventional gas metal arc welding (GMAW) and the other by GMAW and LUIT, where impact treatment was performed at nine stages during filling of the 28-pass weld. Microstructure, hardness, and residual stress in the welds were compared. While residual stress is very similar, there are significant differences in microstructure and hardness. The LUIT weld has mainly equiaxed grains and uniform hardness, while the conventional weld has columnar grains and a hardness gradient. It appears that beads in the LUIT weld did not exhibit columnar grain growth, and instead equiaxed grains grew from the fusion boundary into the weld.
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