PHASE-FIELD STUDY ON THE EVOLUTION OF MICROSTRUCTURE OF THE MOLTEN POOL FOR ADDITIVE MANUFACTURING

Xiao Wenjia; Xu Yuxiang; Song Lijun

doi:10.6052/0459-1879-21-364

Volume 53 Issue 12

Dec. 2021

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Chinese Journal of Theoretical and Applied Mechanics > 2021 > 53(12): 3252-3262. > DOI: 10.6052/0459-1879-21-364 CSTR: 32045.14.0459-1879-21-364

Xiao Wenjia, Xu Yuxiang, Song Lijun. Phase-field study on the evolution of microstructure of the molten pool for additive manufacturing. Chinese Journal of Theoretical and Applied Mechanics, 2021, 53(12): 3252-3262. DOI: 10.6052/0459-1879-21-364

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PHASE-FIELD STUDY ON THE EVOLUTION OF MICROSTRUCTURE OF THE MOLTEN POOL FOR ADDITIVE MANUFACTURING

*.
Hunan Provincial Key Laboratory of Intelligent Laser Manufacturing, School of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China
†.
School of Mechatronic Engineering and Automation, Foshan University, Foshan 528225, Guangdong, China

Received Date: July 28, 2021
Accepted Date: August 29, 2021
Available Online: August 30, 2021

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Abstract

Abstract

Laser Additive Manufacturing (LAM) technology is very suitable for the near net forming of complex integral components and the rapid repair of high value-added damaged parts. However, the complex dynamic solidification process in the molten pool of LAM significantly affects the final microstructure of the formed parts, thereby restricting its service performance. A multi-scale mathematical model that integrates a macro heat and mass transfer and a multi-phase fields was established for the direct energy deposition by laser (DED-L) process of Inconel 718. The direct coupling of the macro-micro temperature field of the molten pool is solved. The two-dimensional global quantitative microstructure simulation of the molten pool is realized based on MPI parallel program design. The grain evolution process in the solidification of the molten pool is studied. The results show that the simulated molten pool size and solidification interface morphology are in good agreement with the experimental results. The morphology of solidification interface and the preferred orientation of crystal are important factors affecting the grain evolution. On the cross-section of the molten pool, the smaller the angle between the preferred orientation and the direction of temperature gradient, the more dominant the grain growth, because the solidification process is mainly driven by the direction of temperature gradient. On the longitudinal-section of the molten pool, the grain growth shows the characteristics of bending growth and "upper triangle". The gradual change of temperature gradient leads to the grain bending, and the competition behavior of adjacent grains determines the grain morphology. In this work, the mechanism of grain evolution in metal LAM is elucidated, which helps to clarify the thermophysical, chemical and metallurgical processes of additive manufacturing, and provides theoretical guidance for the prediction and control of microstructure. In addition, the multi-scale mathematical model can also be applied to the LAM process of other metal materials.
- laser additive manufacturing,
- nickel base superalloys,
- molten pool solidification,
- grain evolution,
- multi-scale simulation

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References (39)

References

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PHASE-FIELD STUDY ON THE EVOLUTION OF MICROSTRUCTURE OF THE MOLTEN POOL FOR ADDITIVE MANUFACTURING

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