Microstructural control and optimization of Haynes 282 manufactured through laser powder bed fusion

The microstructure and properties of alloy Haynes 282 produced through laser powder bed fusion were investigated as a function of the post-deposition heat-treatment. Scanning electron microscopy and X-ray diffraction were utilized to characterize the microstructure, whilst electro-thermal mechanical...

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Hauptverfasser: Christofidou, K.A, Pang, H.T, Li, W, Pardhi, Y, Jones, C.N, Jones, N.G, Stone, H.J
Format: Tagungsbericht
Sprache:eng
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Zusammenfassung:The microstructure and properties of alloy Haynes 282 produced through laser powder bed fusion were investigated as a function of the post-deposition heat-treatment. Scanning electron microscopy and X-ray diffraction were utilized to characterize the microstructure, whilst electro-thermal mechanical testing was used to evaluate the tensile and creep properties at 900 °C. In the as-deposited state, the initial microstructure consisted of the γ and γʹ phases along with M6C and M23C6 carbides. These carbides were observed to govern the recrystallization behaviour of the material and resulted in a minimum recrystallization temperature of 1240 °C. Following post-deposition heat-treatments, the microstructures consisted of a monomodal distribution of γʹ with M6C and M23C6 carbides along the grain boundaries. Tertiary γʹ particles were found to form in the vicinity of carbides in samples that employed a γʹ super-solvus step prior to ageing at 788 °C. The tensile properties were found to be similar in all heat-treated states, consistent with the minimal differences observed in the microstructures. In contrast, significant differences in the creep behaviour of the alloy were observed following the different heat-treatments, although no correlation with the microstructures was observed.
DOI:10.1007/978-3-030-51834-9_99