Analysis of Molten Pool Temperatures and Convection Caused by Laser Cladding

doi:10.12068/j.issn.1005-3026.2020.10.010

Abstract

Abstract: Complicated heat and mass transfer exist inside the molten pool generated by laser cladding. Since the scale of the molten pool is so small that it is difficult to monitor it in real time， a numerical model of laser cladding was constructed， and the temperature distribution and convection mode inside the molten pool were simulated and analyzed. The results showed that the temperature gradient in the molten pool is very large， and the part of the molten pool bottom that extends to the matrix will re-austenitize due to high temperatures. The fluid flow in the molten pool is mainly driven by Marangoni movement， and the convection in the molten pool is annular convection with a maximum flow rate of 0.1m/s. The research results can provide a reliable theoretical basis for the forming process of the cladding layer and the transmission process of the alloy powder in the molten pool.

Key words: laser cladding, molten pool, temperature, Marangoni movement, convection

CLC Number:

TH17

SONG Bo-xue， YU Tian-biao， JIANG Xing-yu， XI Wen-chao. Analysis of Molten Pool Temperatures and Convection Caused by Laser Cladding[J]. Journal of Northeastern University Natural Science, 2020, 41(10): 1427-1431.

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