Anisotropy of Hastelloy X Prepared by Selective Laser Melting After Hot Isostatic Pressuring and Heat Treatment

Anisotropy of selective laser-melted Hastelloy X alloys after hot isostatic pressing and heat treatment (HIP + HT) is investigated. Microscopic characterization revealed that the columnar grains are transformed into equiaxed grains after HIP + HT. The experimental results indicate that the transverse hardness surpassed the vertical hardness, whereas the compressive properties are similar. According to microhardness and nanoindentation tests, the hardness and Young’s modulus in the transverse direction exceeded those in the vertical direction. In situ tensile tests are conducted to qualitatively and quantitatively assess the damage mechanism of the alloys. According to the experimental results, tensile performance is better in the transverse direction than that in the vertical direction. After HIP + HT, the sample retained its degree of anisotropy.