Numerical simulation of phase transition process of laser drilling on GH4037 nickel-based superalloy
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摘要: 为了更准确地研究激光打孔相变过程，基于流体传热和流体力学理论，建立了GH4037镍基高温合金激光打孔相变模型。模型中考虑了重力、粘滞力、反冲压力的作用，以及材料的固-液相变和液-气相变过程，通过数值计算得到了激光打孔相变过程的温度场和速度场。结果表明，气化材料的反冲压力可以加快熔池的流动，在激光功率为2000W、脉宽为1.70ms时，材料最大气化蒸发速率可以达到250m/s。该模型为进一步开展激光打孔研究提供了理论基础。
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关键词:
- 激光技术 /
- 激光打孔 /
- 数值模拟 /
- GH4037镍基高温合金
Abstract: In order to study the phase transformation process of laser drilling more accurately, based on the theories of fluid heat transfer and fluid mechanics, a phase transition model of laser drilling on GH4037 nickel-based superalloy was established. In the model, the effect of gravity, viscous force, recoil pressure, solid-liquid phase transition and liquid-gas phase transition process were considered, and the temperature field and velocity field of laser drilling phase transition process were obtained by numerical calculation. The results show that, the reaction pressure of the gasification material can accelerate the flow of the molten pool. When the laser power is 2000W and the pulse width is 1.70ms, the maximum evaporation rate of the material can reach 250m/s. This model provides a theoretical basis for further research on laser drilling. -
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Table 1 Physical properties of air
T/K cp/(J·kg-1·K-1) κ/(W·m·-1K-1) μ /(Pa·s) 300 1.005×103 0.0262 1.983×10-5 500 1.029×103 0.0403 2.671×10-5 1000 1.141×103 0.0675 4.152×10-5 1500 1.230×103 0.0946 5.400×10-5 2000 1.338×103 0.1240 6.500×10-5 2500 1.688×103 0.1750 7.670×10-5 
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Table 2 Physical properties of GH4037 Nickel-based superalloy
propertiy value specific heat of solid phase cp, s 440J/(kg·K) thermal conductivity of solid phase κs 13.8W/(m·K) thermal conductivity of melting phase κm 23.9W/(m·K) dynamic viscosity μ 0.006Pa·s latent heat of melting Hm 296kJ/kg latent heat of vaporization Hv 6423kJ/kg melting temperature Tm 1585K vaporization temperature Tv 3005K
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