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通过建立粉末在激光照射下的热传导模型，用有限差分法计算了不同合金、不同粒度的粉末在不同激光功率密度作用下的温度变化，通过实验验证得出各种粉末在不同激光功率下的临界熔化时间和相应的临界激光扫描速度。
Through the establishment of the heat conduction model of the powder under the laser irradiation, the temperature variation of the powders with different alloys and different particle sizes under different laser power densities was calculated by the finite difference method. The critical values of the powders under different laser powers Melting time and the corresponding critical laser scanning speed.