Effect of heat treatment on the microstructure characteristics and microhardness of a novel γ′ nickel-based superalloy by laser powder bed fusion

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Xu, Jinghao,1992-Linköpings universitet,Konstruktionsmaterial,Tekniska fakulteten (author)

Effect of heat treatment on the microstructure characteristics and microhardness of a novel γ′ nickel-based superalloy by laser powder bed fusion

Article/chapterEnglish2021

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Elsevier BV,2021
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LIBRIS-ID:oai:research.chalmers.se:053e248c-018d-483a-8dfb-859576bbc27d
https://doi.org/10.1016/j.rinma.2021.100232DOI
https://research.chalmers.se/publication/529250URI
https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-181233URI

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Language:English
Summary in:English

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The fabrication of gamma prime (γ′) strengthened nickel-based superalloys by additive manufacturing (AM) techniques is of huge interest from the industrial and research community owing to their excellent high-temperature properties. The effect of post-AM-processing heat treatment on the microstructural characteristics and microhardness response of a laser powder bed fused (LPBF) γ′ strengthened nickel-based superalloy, MAD542, is systematically investigated. Post-processing heat treatment shows the significant importance of tailoring the γ′ morphology. With insufficient solutioning duration time, coarse γ′ formed in the interdendritic region heterogeneously, due to the lack of chemical composition homogenization. The cooling rate from the super-solvus solutioning plays an important role in controlling the γ′ size and morphology. Spherical γ′ is formed during the air cooling while irregularly shaped γ′ formed during the furnace cooling. The following aging heat treatment further tunes the γ′ morphology and γ channel width. After two-step aging, cuboidal γ′ is developed in the air-cooled sample, while in contrast, bi-modally distributed γ′ is developed in the furnace cooled sample with fine spherical γ′ embedded in the wide γ channel between coarse irregular shaped secondary γ′. More than 90% of the grains recrystallized during solutioning treatment at the super-solvus temperature for 30 min. The rapid recrystallization kinetics are attributed to the formation of annealing twins which significantly reduced the stored energy. Microhardness responses from different heat-treated conditions were examined.

Subject headings and genre

TEKNIK OCH TEKNOLOGIER Maskinteknik Energiteknik hsv//swe
ENGINEERING AND TECHNOLOGY Mechanical Engineering Energy Engineering hsv//eng
TEKNIK OCH TEKNOLOGIER Annan teknik Livsmedelsteknik hsv//swe
ENGINEERING AND TECHNOLOGY Other Engineering and Technologies Food Engineering hsv//eng
TEKNIK OCH TEKNOLOGIER Materialteknik Metallurgi och metalliska material hsv//swe
ENGINEERING AND TECHNOLOGY Materials Engineering Metallurgy and Metallic Materials hsv//eng
TEKNIK OCH TEKNOLOGIER Materialteknik hsv//swe
ENGINEERING AND TECHNOLOGY Materials Engineering hsv//eng
Recrystallization
LPBF
Nickel-based superalloy
Gamma prime γ′
Heat treatment

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Schulz, Fiona,1990Chalmers tekniska högskola,Chalmers University of Technology,Div of Materials and Manufacture, Dept of Industrial and Mateials Science, Chalmers, Gothenburg(Swepub:cth)sfiona (author)
Peng, Ru Lin,1960-Linköpings universitet,Konstruktionsmaterial,Tekniska fakulteten(Swepub:liu)rupe37 (author)
Hryha, Eduard,1980Chalmers tekniska högskola,Chalmers University of Technology,Div of Materials and Manufacture, Dept of Industrial and Mateials Science, Chalmers, Gothenburg(Swepub:cth)hryha (author)
Moverare, Johan,1973-Linköpings universitet,Konstruktionsmaterial,Tekniska fakulteten(Swepub:liu)johmo31 (author)
Linköpings universitetKonstruktionsmaterial (creator_code:org_t)

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In:Results in Materials: Elsevier BV122590-048X

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