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利用ANSYS对脉冲放电电磁热止裂温度场和应力场进行模拟,然后对电磁热止裂后的16Mn钢试样熔覆Ni45合金粉末的表面温度场瞬时变化进行模拟。结果表明,在8000 V高压脉冲电压下,裂纹尖端的温度可达1500℃以上,裂尖部分熔化,进而使裂尖钝化,脉冲放电后1000 s时构件的温度基本接近室温。脉冲放电瞬间接近裂尖处的残余应力较大,而远离裂尖处的压应力较小。激光熔覆过程中垂直于激光扫描方向存在着一定的温度梯度。
The temperature field and the stress field of the electromagnetic crack of the pulse discharge were simulated by ANSYS. Then, the transient changes of the surface temperature field of the NiMg alloy powder coated with the 16Mn steel after the electromagnetic cracking were simulated. The results show that under the high voltage pulse voltage of 8000 V, the temperature at the tip of the crack tip can reach 1500 ℃, and the crack tip is partially melted, which leads to the degeneration of the crack tip. The temperature of the component at 1000 s after pulse discharge is close to room temperature. The residual stress near the crack tip at the instant of pulse discharge is larger, while the compressive stress away from the crack tip is smaller. Laser cladding perpendicular to the laser scanning process there is a certain temperature gradient.