Molecular dynamics simulation of NiCr alloy fabricated by micro-plasma additive manufacturing

YUAN Xiaojing; GUO Xiaohui; GUAN Ning; WANG Xuping; ZHAN Jun; SUN Lei

doi:10.12073/j.hjxb.20210131001

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2021 > 42(8): 25-32. > DOI: 10.12073/j.hjxb.20210131001

YUAN Xiaojing, GUO Xiaohui, GUAN Ning, WANG Xuping, ZHAN Jun, SUN Lei. Molecular dynamics simulation of NiCr alloy fabricated by micro-plasma additive manufacturing[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2021, 42(8): 25-32. DOI: 10.12073/j.hjxb.20210131001

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Molecular dynamics simulation of NiCr alloy fabricated by micro-plasma additive manufacturing

1.
Combat support College of rocket Army Engineering University, Xi'an, 710025, China
2.
Rocket Army Research Institute, Beijing, 100010, China
3.
96864 unit of PLA, Luoyang, 431700, China

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Received Date: January 30, 2021
Available Online: October 24, 2021

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Abstract

Abstract

The rapid solidification process of NiCr alloy produced by micro arc plasma has an important influence on the microstructure and properties of structural parts manufactured by additive. In this paper, molecular dynamics (MD) was used to simulate the temperature field and the growth of equiaxed grains in the process of micro arc plasma additive forming NiCr alloy components. The results show that the NiCr alloy exhibits amorphous solidification at cooling rates of 3.38 K/ps and 0.675 K/ps, and the NiCr alloy spontaneously nucleates and grows at cooling rates of 0.077 5 K/ps, realizing equiaxed solidification and crystallization. The simulation results are in good agreement with the phase field method and the electron micrographs of equiaxed region, which provides a theoretical basis for the study of microstructure evolution of NiCr alloy fabricated by micro arc plasma additive manufacturing.
- plasma additive manufacturing,
- molecular dynamics,
- numerical simulation,
- NiCr alloy

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References (15)

References

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Molecular dynamics simulation of NiCr alloy fabricated by micro-plasma additive manufacturing