首页|Experimental and numerical study on residual stresses relief in 316 L austenitic stainless steel welded joints using layer-by-layer ultrasonic impact treatment
Experimental and numerical study on residual stresses relief in 316 L austenitic stainless steel welded joints using layer-by-layer ultrasonic impact treatment
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NETL
NSTL
Elsevier
Serving as an essential step in the design, processing, and forming of the constructional steel in real application scenarios, welding inevitably introduces substantial tensile residual stresses, which compromise fatigue strength, increase the risk of crack initiation and propagation, and jeopardize system safety. The suppression and elimination of welding residual stress in 316 L austenitic stainless steel is one of the key scientific problems that urgently needs to be solved, which can be helpful to expand the practical application of structural steel in new engineering fields such as renewable energy and fusion devices. In this study, the experimental and numerical study on welding residual stresses relief and mechanical properties assessment of 316 L austenitic stainless steel welded joints practically used in the construction of fusion reactor components via layer-by-layer ultrasonic impact treatment was carried out. Effects of surface and layer-by-layer ultrasonic impact treatment (UIT) on the surface residual stress, tensile properties, impact toughness, and microstructures of welded joints made from this specialized fusion reactor material were compared and analyzed. The results revealed that both UIT processes effectively reduced tensile residual stresses in both directions within the impact zone while preserving the fundamental mechanical properties of the welded joints. Furthermore, layer-by-layer UIT demonstrated superior performance compared to surface UIT, achieving residual stress reduction rates of up to 52.31 % for longitudinal stress and 42.62 % for transverse stress, along with the induction of compressive stress in some regions. Additionally, the layer-by-layer UIT refined the grain size within welded joints, which led to the enhancement of the local strength. These findings demonstrate the enhanced effectiveness of layer-by-layer UIT for residual stress management of the 316 L stainless steel, providing physical insights for optimizing welding fabrication processes and improving the reliability of new engineering systems.
316 L stainless steelLayer-by-layer UITResidual stressesTensile propertiesImpact toughnessMicrostructure analysisMODEL
NETL
NSTL
Elsevier
