Effect of building direction and heat treatment on mechanical properties of Inconel 939 prepared by additive manufacturing

0563991 - ÚFM 2025 RIV KR eng J - Journal Article
Šulák, Ivo - Babinský, Tomáš - Chlupová, Alice - Milovanović, A. - Náhlík, Luboš
Effect of building direction and heat treatment on mechanical properties of Inconel 939 prepared by additive manufacturing.
Journal of Mechanical Science and Technology. Roč. 37, č. 3 (2023), s. 1071-1076. ISSN 1738-494X. E-ISSN 1976-3824
EU Projects: European Commission(XE) 857124 - Horizont 2020
Institutional support: RVO:68081723
Keywords : Additive manufacturing rrangement * Dislocation arrangement * Electron backscattered diffraction * Microstructural characterization * Mechanical properties * Nickel-based superalloy
OECD category: Materials engineering
Impact factor: 1.6, year: 2022
Method of publishing: Limited access
https://link.springer.com/article/10.1007/s12206-022-2101-7

This study investigated the effect of building direction (BD) and three-step heat treatment on the microstructure and mechanical properties of a nickel-based superalloy Inconel 939 produced by additive manufacturing (AM), and it revealed the differences to the conventional cast superalloy. Tensile specimens were printed in horizontal and vertical BDs, and tensile tests were performed at room temperature, 700 °C and 800 °C. Thorough microstructural scrutiny conducted through light and electron microscopy revealed microstructural differences between AM and cast Inconel 939. The columnar grain structure with a preferential orientation of 001 was typical for AM alloy, whereas polyhedral grain without any specific orientation was typical for cast alloy. Experiments showed that the AM material had much better mechanical properties than the cast material. Heat treatment resulted in a formation of a fine dispersion of spherical γ′ nanoprecipitates, triggering a considerable increase in tensile strength and a drop in ductility.
Permanent Link: https://hdl.handle.net/11104/0335747