With the implementation of more stringent emissions standards, ultrahigh strength steel has been increasingly used in vehicle body to reduce the carbon emissions, but softening in the heat-affected zone is one of the most serious issues faced with in welding of this steel. In this paper, a finite element model (FEM) was developed to estimate temperature distribution in laser welding of lapped martensitic steels M1500 considering the effect of interface. Three methods to characterize the effect of interface have been adopted. The comparison result shows that the method using two groups of contact elements with birth and death options could accurately characterize the thermal contact conductance properties of the interface before and after welding, respectively. Based on the simulated temperature–time curve, a carbon diffusion model was then developed to estimate the martensite tempering transformation in the softening zone. Maximum softening degree and location of the softening zone were estimated and validated by hardness measurement experiments.
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November 2016
Research-Article
Modeling of Temperature Distribution in Laser Welding of Lapped Martensitic Steel M1500 and Softening Estimation
Hongze Wang,
Hongze Wang
State Key Laboratory of Mechanical
System and Vibration,
Shanghai Jiao Tong University,
Shanghai 200240, China
System and Vibration,
Shanghai Jiao Tong University,
Shanghai 200240, China
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Yansong Zhang,
Yansong Zhang
Shanghai Key Laboratory of Digital Manufacture
for Thin-Walled Structures,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: zhangyansong@sjtu.edu.cn
for Thin-Walled Structures,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: zhangyansong@sjtu.edu.cn
Search for other works by this author on:
Kunkun Chen
Kunkun Chen
State Key Laboratory of Mechanical
System and Vibration,
Shanghai Jiao Tong University,
Shanghai 200240, China
System and Vibration,
Shanghai Jiao Tong University,
Shanghai 200240, China
Search for other works by this author on:
Hongze Wang
State Key Laboratory of Mechanical
System and Vibration,
Shanghai Jiao Tong University,
Shanghai 200240, China
System and Vibration,
Shanghai Jiao Tong University,
Shanghai 200240, China
Yansong Zhang
Shanghai Key Laboratory of Digital Manufacture
for Thin-Walled Structures,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: zhangyansong@sjtu.edu.cn
for Thin-Walled Structures,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: zhangyansong@sjtu.edu.cn
Kunkun Chen
State Key Laboratory of Mechanical
System and Vibration,
Shanghai Jiao Tong University,
Shanghai 200240, China
System and Vibration,
Shanghai Jiao Tong University,
Shanghai 200240, China
1Corresponding author.
Manuscript received August 3, 2015; final manuscript received March 30, 2016; published online June 23, 2016. Assoc. Editor: Hongqiang Chen.
J. Manuf. Sci. Eng. Nov 2016, 138(11): 111006 (9 pages)
Published Online: June 23, 2016
Article history
Received:
August 3, 2015
Revised:
March 30, 2016
Citation
Wang, H., Zhang, Y., and Chen, K. (June 23, 2016). "Modeling of Temperature Distribution in Laser Welding of Lapped Martensitic Steel M1500 and Softening Estimation." ASME. J. Manuf. Sci. Eng. November 2016; 138(11): 111006. https://doi.org/10.1115/1.4033391
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