Taking GH4169 Nickel-based high-temperature superalloy as the research material,the numerical simulation of temperature field and thermal cycle in selective laser melting(SLM)forming process under different laser power and scanning speed is carried out by ANSYS finite element software.The evolution mechanism of SLM temperature field and its influence on the properties of final parts are systematically analyzed and revealed.The results show that each unit of the powder bed goes through the temperature cycle of rapid heating and rapid cooling during the SLM forming process,and the cycle curve consists of one large temperature crest and several small temperature peaks;reasonable setting of laser power and scanning speed is conducive to full melting and interchannel and interlayer fusion of alloy powder;too low laser power or too fast scanning speed will lead to too low heat source temperature,alloy powder can not be fully melted,resulting in forming defects;the laser power is too high or the scanning speed is too slow,will lead to the heat source center temperature is too high and the powder bed temperature gradient is large,easy to cause the alloy powder overheating,splashing and carbonization,the final parts warping deformation.
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