Simulation of microstructure evolution of weld pool and heat-affected zone during TIG welding of nickel-base alloy

LIU Renpei; CHEN Lili; WEI Yanhong

doi:10.12073/j.hjxb.20190905006

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2020 > 41(3): 64-68. > DOI: 10.12073/j.hjxb.20190905006

LIU Renpei, CHEN Lili, WEI Yanhong. Simulation of microstructure evolution of weld pool and heat-affected zone during TIG welding of nickel-base alloy[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2020, 41(3): 64-68. DOI: 10.12073/j.hjxb.20190905006

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Simulation of microstructure evolution of weld pool and heat-affected zone during TIG welding of nickel-base alloy

Nanjing University of Aeronautics and Astronautics, Nanjing, 210016,China

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Received Date: September 04, 2019
Available Online: July 12, 2020

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Abstract

Abstract

Model for microstructure of molten pool and HAZ was developed based on the dendritic growth kinetics and the grain growth theory using the cellular automaton method.The temperature field during TIG welding process was calculated by the finite element model. And the thermal cycle curves were applied to the CA model to calculate the dendrite growth in the molten pool and grain growth in the heat-affected zone. The simulation results showed that the nuclei at the fusion boundary mainly grows in the form of columnar dendrite toward the center of the weld. The final morphology depends on the partially melted grains of base metal at the fusion boundary and competition growing between dendrite arrays with different orientation. The microstructure at the center of the molten pool was equiaxed dendrites. The grain growth in the heat-affected zone results in the columnar structure of the molten pool coarser. The simulation results agree well with the experimental results.
- cellular automata,
- molten pool,
- dendrite arrays,
- heat-affected zone,
- grain growth

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References

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Simulation of microstructure evolution of weld pool and heat-affected zone during TIG welding of nickel-base alloy