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1 "Ni-based superalloy"
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Evaluation of Mechanical Properties and Microstructure Depending on Sintering Heating Rate of IN 939W Alloy
Junhyub Jeon, Junho Lee, Namhyuk Seo, Seung Bae Son, Jae-Gil Jung, Seok-Jae Lee
J Powder Mater. 2022;29(5):399-410.   Published online October 1, 2022
DOI: https://doi.org/10.4150/KPMI.2022.29.5.399
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Changes in the mechanical properties and microstructure of an IN 939 W alloy according to the sintering heating rate were evaluated. IN 939 W alloy samples were fabricated by spark plasma sintering. The phase fraction, number density, and mean radius of the IN 939W alloy were calculated using a thermodynamic calculation. A universal testing machine and micro-Vickers hardness tester were employed to confirm the mechanical properties of the IN 939W alloy. X-ray diffraction, optical microscopy, field-emission scanning electron microscopy, Cs-corrected-field emission transmission electron microscopy, and energy dispersive X-ray spectrometry were used to evaluate the microstructure of the alloy. The rapid sintering heating rate resulted in a slightly dispersed γ' phase and chromium oxide. It also suppressed the precipitation of the η phase. These helped to reinforce the mechanical properties.


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