Response of different electron beam melting produced Alloy 718 microstructures to thermal post-treatments

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Response of different electron beam melting produced Alloy 718 microstructures to thermal post-treatments

Gundgire, Tejas, 1994- (author): Högskolan Väst,Avdelningen för avverkande och additativa tillverkningsprocesser (AAT),University West

Goel, Sneha, 1993- (author): Högskolan Väst,Avdelningen för avverkande och additativa tillverkningsprocesser (AAT),PTW,University West

Klement, Uta, 1962 (author): Chalmers University of Technology, Department of Industrial and Material Science, Gothenburg, 41296, Sweden,Chalmers tekniska högskola

Joshi, Shrikant V., 1960- (author): Högskolan Väst,Forskningsmiljön produktionsteknik(PTW),PTW,University West

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Elsevier BV, 2020
2020
English.
In: Materials Characterization. - : Elsevier BV. - 1044-5803 .- 1873-4189. ; 167

Related links:: https://doi.org/10.1...; show more...; https://research.cha... (primary) (free); https://urn.kb.se/re...; https://doi.org/10.1...; https://research.cha...; https://research.cha...; show less...

Journal article (peer-reviewed)

Abstract Subject headings

Electron beam melting (EBM) was used to produce Alloy 718 specimens with different microstructures (columnar, equiaxed and a combination thereof) by varying the process parameters. The present study aimed at assessing the response of such varying as-built microstructures to identical thermal post-treatments, which included hot isostatic pressing (HIPing) followed by heat treatment involving solution treatment and aging. The effect of these treatments on defect content, grain structure, hardness and phase constitution in the specimens was specifically analysed. Despite differences in defect content of as-built specimens with distinct microstructures, HIPing was effective in closing defects leading to samples exhibiting similar density. After HIPing, grains with equiaxed morphology or columnar grains with lower aspect ratio showed higher tendency for grain growth in comparison to the columnar grains with higher aspect ratio. The various factors affecting the stability of grains during HIPing of builds with distinct microstructures were investigated. These factors include texture, grain size, and secondary phase particles. The carbide sizes in the different as-built samples varied but were found to be largely unaffected by the post-treatments. Solution treatment following HIPing led to greater precipitation of grain boundary ÎŽ phase in regions with coarser grains than the smaller ones. After HIPing and heat treatment, all specimens exhibited similar precipitation of Î³â³ phase regardless of their grain morphology in the as-built condition. © 2020 The Author(s)

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 (hsv//swe)
ENGINEERING AND TECHNOLOGY -- 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)

Keyword

Carbides; Electron beam melting; Electron beams; Grain boundaries; Grain growth; Grain size and shape; Heat treatment; Hot isostatic pressing; Morphology; Textures
Coarser grains; Defect contents; Grain morphologies; Phase constitution; Process parameters; Secondary phase particles; Solution treatments; Thermal post-treatments
Aspect ratio
Additive manufacturing
Alloy 718
Columnar
Equiaxed
Post-Treatment

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