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On the strengthenin...
On the strengthening and embrittlement mechanisms of an additively manufactured Nickel-base superalloy
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- Xu, Jinghao (author)
- Linköpings universitet,Konstruktionsmaterial,Tekniska fakulteten
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- Gruber, Hans, 1983 (author)
- Chalmers tekniska högskola,Chalmers University of Technology,Chalmers University of Technology, Gothenburg, Sweden
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- Boyd, Robert, 1972- (author)
- Linköpings universitet,Plasma och ytbeläggningsfysik,Tekniska fakulteten
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- Jiang, Shuang (author)
- Linköpings universitet,Konstruktionsmaterial,Tekniska fakulteten
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- Peng, Ru Lin, 1960- (author)
- Linköpings universitet,Konstruktionsmaterial,Tekniska fakulteten
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- Moverare, Johan, 1973- (author)
- Linköpings universitet,Konstruktionsmaterial,Tekniska fakulteten
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(creator_code:org_t)
- Elsevier BV, 2020
- 2020
- English.
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In: Materialia. - : Elsevier BV. - 2589-1529. ; 10
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Abstract
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- The γ′ phase strengthened Nickel-base superalloy is one of the most significant dual-phase alloy systems for high-temperature engineering applications. The tensile properties of laser powder-bed-fused IN738LC superalloy in the as-built state have been shown to have both good strength and ductility compared with its post-thermal treated state. A microstructural hierarchy composed of weak texture, sub-micron cellular structures and dislocation cellular walls was promoted in the as-built sample. After post-thermal treatment, the secondary phase γ′ precipitated with various size and fraction depending on heat treatment process. For room-temperature tensile tests, the dominated deformation mechanism is planar slip of dislocations in the as-built sample while dislocations bypassing the precipitates via Orowan looping in the γ′ strengthened samples. The extraordinary strengthening effect due to the dislocation substructure in the as-built sample provides an addition of 372 MPa in yield strength. The results of our calculation are in agreement with experimental yield strength for all the three different conditions investigated. Strikingly, the γ′ strengthened samples have higher work hardening rate than as-built sample but encounter premature failure. Experimental evidence shows that the embrittlement mechanism in the γ′ strengthened samples is caused by the high dislocation hardening of the grain interior region, which reduces the ability to accommodate further plastic strain and leads to premature intergranular cracking. On the basis of these results, the strengthening micromechanism and double-edge effect of strength and ductility of Nickel-base superalloy is discussed in detail.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Bearbetnings-, yt- och fogningsteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Manufacturing, Surface and Joining Technology (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Annan materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Other Materials 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)
Keyword
- Mechanical property
- Nickel-base superalloy
- Laser powder-bed-fusion
- γ′ phase
- Cellular structure
Publication and Content Type
- art (subject category)
- ref (subject category)
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Xu, Jinghao
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Gruber, Hans, 19 ...
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Boyd, Robert, 19 ...
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Jiang, Shuang
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Peng, Ru Lin, 19 ...
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Moverare, Johan, ...
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Materialia
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Chalmers University of Technology
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Linköping University