Abstract
In this paper, the microstructure and mechanical properties of SLM-Hastelloy X alloy treated by hot isostatic pressing and heat treatment (HIP + HT) were studied. The microscopic characteristics show that the grains are transformed into equiaxed grains after different HIP + HT. The precipitates of M23C6 carbide are distributed in grains and grains boundaries. The number of precipitates in grains decreased during the increase of the temperature of the heat treatment. The results of nano-indentation experiments show that the average elastic modulus first increases and decreases with the growth of heat treatment temperature, and the average hardness fluctuates significantly in increasing the temperature of post-treatment. When the heat treatment temperature reaches the maximum value, the minimum value of average hardness is obtained of 2.46 GPa. The Vickers hardness decreases from 204HV0.5 to 188HV0.5 with the increase of heat treatment temperature. According to tensile tests, a good combination of strength and plastic properties of SLM-Hastelloy X alloy after HIP + HT treatment is obtained except for HIP+1150 °C/h.
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