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Effect of post-trea...
Effect of post-treatments under hot isostatic pressure on microstructural characteristics of EBM-built Alloy 718
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- Goel, Sneha, 1993- (author)
- Högskolan Väst,Avdelningen för avverkande och additativa tillverkningsprocesser (AAT)
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- Sittiho, Anumat (author)
- University of Idaho,University of Idaho, Department of Chemical and Materials Engineering, Moscow, ID 83844, United States
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- Charit, Indrajit (author)
- University of Idaho,University of Idaho, Department of Chemical and Materials Engineering, Moscow, ID 83844, United States
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- Klement, Uta, 1962 (author)
- Chalmers tekniska högskola,Chalmers University of Technology,Chalmers University of Technology, Department of Industrial and Materials Science, Gothenburg, Sweden
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- Joshi, Shrikant V., 1960- (author)
- Högskolan Väst,Forskningsmiljön produktionsteknik(PTW),PTW
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(creator_code:org_t)
- Elsevier BV, 2019
- 2019
- English.
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In: Additive Manufacturing. - : Elsevier BV. - 2214-8604 .- 2214-7810. ; 28, s. 727-737
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Abstract
Subject headings
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- Electron beam melting (EBM) has emerged as an important additive manufacturing technique. In this study, Alloy 718 produced by EBM was investigated in as-built and post-treated conditions for microstructural characteristics and hardness. The post-treatments investigated were hot isostatic pressing (HIP) and combined HIP + heat treatment (HIP + HT) carried out as a single cycle inside the HIP vessel. Both the post-treatments resulted in significant decrease in defects inevitably present in the as-built material. The columnar grain structure of the as-built material was found to be maintained after post-treatment, with some sporadic localized grain coarsening noted. Although HIP led to complete dissolution of δ and γ′′ phase, stable NbC and TiN (occasionally present) particles were observed in the post-treated specimens. Significant precipitation of γ′′ phase was observed after HIP + HT, which was attributed to the two-step aging heat treatment carried out during HIP + HT. The presence of γ′′ phase or otherwise was correlated to the hardness of the material. While the HIP treatment resulted in drop in hardness, HIP + HT led to ‘recovery’ of the hardness to values exceeding those exhibited by the as-built material.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering (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 -- Bearbetnings-, yt- och fogningsteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Manufacturing, Surface and Joining Technology (hsv//eng)
Keyword
- Electron beam melting
- gamma ''
- Hot isostatic pressing
- Additive manufacturing
- Alloy 718
- Heat treatment
- Produktions- och materialteknik
Publication and Content Type
- art (subject category)
- ref (subject category)
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