Effect of tailored martensitic transformation in a thick weld: Residual stresses mitigation, heterogeneous microstructure, and mechanical properties

Wang, H.; Woo, Wanchuck; Kim, D.K.; Em, V. T.; Karpov, I. D.; An, Gyubaek; Lee, S.Y.

doi:10.1016/j.matchar.2018.07.025

Cited by 19 publications

(4 citation statements)

References 36 publications

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“…Promoppatum et al [ 12 ] investigated the thermal history of the AM component experimentally and numerically, and Rodgers et al [ 13 ] simulated the microstructure imposed by the AM process. The investigation of internal stress development on the AM component is an important issue in the integrity of the material, as in the case of the welding process [ 14 , 15 ]. In general, the compressive residual stresses are developed inside and tensile residual stresses are developed on the surface of the AM component along the building direction [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

Unravelling thermal history during additive manufacturing of martensitic stainless steel

Chae

Huang

Woo

et al. 2021

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Unravelling thermal history during additive manufacturing of martensitic stainless steel

Chae

Huang

Woo

et al. 2021

Journal of Alloys and Compounds

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“…The elastic strain follows the isotropic Hooke law with elastic parameters including Young's modulus and Poisson's ratio. The plastic strain obeys the Von Mises yield criterion represented by Equation (11) and isotropic hardening model with plastic parameters including yield stress and plastic strain:…”

Section: Simulation Of Welding Residual Stressmentioning

confidence: 99%

“…There are many post-weld methods mature in decreasing the welding residual stress, such as post-weld heat treatment [6], shot peening [7], post-weld rolling methods [8], water jet peening [9], etc. Some methods that are used before and during welding can also play an important role in decreasing welding residual stress, such as using proper groove distances [10], welding with low transformation temperature consumables [11], a preheating process [2], ultrasonic vibration [12][13][14], etc. However, compared with the above treatments, ultrasonic impact treatment (UIT) has superiority in reducing residual stresses and improving fatigue strength.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Simulation to Study the Reduction of Welding Residual Stress by Ultrasonic Impact Treatment

et al. 2020

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In this study, the effects of ultrasonic impact treatment (UIT) on the residual stress in a repair welding joint are investigated by experimental and finite element methods. A three-dimensional numerical analysis approach including a thermomechanical-coupled welding simulation and dynamic elastic-plastic UIT simulation is developed, which has been validated by X-ray diffraction measurement and indentation strain method. The results show that longitudinal residual stresses basically turned into the small tensile stress state from the large tensile stress state, and transverse residual stresses have mainly turned into compressive stresses from large tensile stress after the UIT. In the thickness direction, the average decrease of longitudinal residual stress is 259.9 MPa, which is larger than the 149.1 MPa of transverse residual stress. The calculated residual stress distribution after the UIT of the thin plate is compared with that of the thick plate in the literature, with the results showing the stress accumulation layer inside the thick plate. The simulation results show that the elastic strains are decreased slightly and the equivalent plastic strain is increased markedly after UIT, which explains the mechanism of residual stress relaxation.

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“…Welding is a principal process for joining the structural metal products that are used in the automotive industry [2,3,4]. Advanced welding processes for automotive applications have been actively developed, enabling a reduction in vehicle weight.…”

Section: Introductionmentioning

confidence: 99%

Effect of Quenching Tempering-Post Weld Heat Treatment on the Microstructure and Mechanical Properties of Laser-Arc Hybrid-Welded Boron Steel

et al. 2019

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In the present study, we have investigated the effect of post-welding heat treatment (PWHT) of quenching and tempering (QT) on the microstructure and mechanical properties of welded boron steel joints processed using laser-arc hybrid welding on two commercial filler materials, SM80 (Type-I) and ZH120 (Type-II). The microstructure and mechanical properties of the weld joints were characterized via optical microscopy, Vickers microhardness, and the uniaxial tensile test. The macrostructure of the weld joint was composed of a fusion zone (FZ), heat-affected zone (HAZ), and base metal zone (BMZ). After the QT-PWHT, the QT specimens revealed the V-shape hardness distribution across the weld joint, while the as-welded specimen exhibited the M-shape hardness distribution. As a result, the QT specimens revealed the premature fracture with little reduction in the area at the interface between the HAZ and FZ, while the as-welded specimen exhibited the local necking and rupture in the BMZ. In addition, the Type-II filler material with a greater value of equivalent carbon content was rarely influenced by the tempering, maintaining its hardness in the as-quenched status, while the Type-I filler material showed a gradual decrease in hardness with the tempering time. The results demonstrate that the Type-II weld joint outperformed the Type-I weld joint in terms of the structural integrity of welded parts.

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Effect of tailored martensitic transformation in a thick weld: Residual stresses mitigation, heterogeneous microstructure, and mechanical properties

Cited by 19 publications

References 36 publications

Unravelling thermal history during additive manufacturing of martensitic stainless steel

Unravelling thermal history during additive manufacturing of martensitic stainless steel

Experimental and Numerical Simulation to Study the Reduction of Welding Residual Stress by Ultrasonic Impact Treatment

Effect of Quenching Tempering-Post Weld Heat Treatment on the Microstructure and Mechanical Properties of Laser-Arc Hybrid-Welded Boron Steel

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