Effect of Solid-State Phase Transformation and Transverse Restraint on Residual Stress Distribution in Laser-Arc Hybrid Welding Joint of Q345 Steel

A Q345 steel butt-welded joint was manufactured using laser-arc hybrid welding (LAHW) technology, and its microstructure, microhardness, and residual stress (RS) distribution were measured. Using ABAQUS software, a sequentially coupled thermo-metallurgical-mechanical finite element method was employ...

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Bibliographic Details
Published in:Materials 2024-05, Vol.17 (11), p.2632
Main Authors: Feng, Ruiyang, Liu, Denggao, Zhang, Chaohua, Pan, Yunlong, Wang, Yanjun, Chen, Jie, Ye, Xiaojun, Lei, Min, Li, Yulong
Format: Article
Language:English
Subjects:
Analysis
Arc welding
Butt joints
Butt welding
Constraints
Finite element method
Hardness
Heat affected zone
High strength low alloy steels
Investigations
Laser beam welding
Lasers
Martensite
Martensitic transformations
Microhardness
Microstructure
Numerical analysis
Phase transitions
Residual stress
Simulation
Simulation methods
Solid state
Steel
Stress distribution
Structural steels
Temperature
Welded joints
Welding
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Summary:A Q345 steel butt-welded joint was manufactured using laser-arc hybrid welding (LAHW) technology, and its microstructure, microhardness, and residual stress (RS) distribution were measured. Using ABAQUS software, a sequentially coupled thermo-metallurgical-mechanical finite element method was employed to model the welding RS distribution in the LAHW joint made of Q345 steel. The effects of solid-state phase transformation (SSPT) and transverse restraint on the welding RS distribution were explored. The results show that a large number of martensite phase transformations occurred in the fusion zone and heat-affected zone of the LAHW joint. Furthermore, the SSPT had a significant effect on the magnitude and distribution of RS in the LAHW joint made of Q345 steel, which must be taken into account in numerical simulations. Transverse restraints markedly increased the transverse RS on the upper surface, with a comparatively minor impact on the longitudinal RS distribution. After the transverse restraint was released, both the longitudinal and transverse RS distributions in the LAHW joint reverted to a level akin to that of the welded joint under free conditions.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma17112632