Reduction in mechanical anisotropy through high temperature heat treatment of Hastelloy X processed by Selective Laser Melting (SLM)

17th International Conference on Textures of Materials

材料科学;物理学

Etter, T.^1 ; Kunze, K.^2 ; Geiger, F.^1 ; Meidani, H.^1

ALSTOM (Switzerland) Ltd, Baden, Switzerland^1

Scientific Centre for Optical and Electron Microscopy, ETH Zurich, Switzerland^2

关键词: Additive manufacturing technology;    After high temperature;    Anisotropic mechanical properties;    Electron back scatter diffraction;    High temperature heat treatment;    Loading direction;    Mechanical anisotropy;    Selective laser melting;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/82/1/012097/pdf
DOI  :  10.1088/1757-899X/82/1/012097

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Selective Laser Melting (SLM) is an additive manufacturing technology used to directly produce metallic parts from thin powder layers. To evaluate the anisotropic mechanical properties, tensile test specimens of the Ni-base alloy Hastelloy X were built with the loading direction oriented either parallel (z-specimens) or perpendicular to the build-up direction (xy- specimens). Specimens were investigated in the "as-built" condition and after high temperature heat treatment. Tensile tests at room temperature and at 850°C of "as-built" material have shown different mechanical properties for z- and xy-specimens. The anisotropy is reflected in the Young's modulus, with lower values measured parallel to the build-up direction. It is shown that the anisotropy is significantly reduced by a subsequent recrystallization heat treatment. The characterization of microstructural and textural anisotropy was done by Electron Back Scatter Diffraction (EBSD) analysis. Predictions of Young's modulus calculated from the measured textures compare well with the data from tensile tests.