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Effect of Direct En...
Effect of Direct Energy Deposition Process Parameters on Single-Track Deposits of Alloy 718
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- Sreekanth, Suhas (författare)
- Högskolan Väst,Avdelningen för svetsteknologi (SV),PTW,Department of Engineering Science, University West, Trollhättan, Sweden
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- Hurtig, Kjell, 1960- (författare)
- Högskolan Väst,Avdelningen för svetsteknologi (SV),PTW,Department of Engineering Science, University West, Trollhättan, Sweden
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- Joshi, Shrikant V., 1960- (författare)
- Högskolan Väst,Avdelningen för avverkande och additativa tillverkningsprocesser (AAT),PTW,Department of Engineering Science, University West, Trollhättan, Sweden
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- Andersson, Joel, 1981- (författare)
- Högskolan Väst,Avdelningen för svetsteknologi (SV),PTW,Department of Engineering Science, University West, Trollhättan, Sweden
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- Ghassemali, Ehsan, 1983- (författare)
- Jönköping University,JTH, Material och tillverkning
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(creator_code:org_t)
- 2020-01-07
- 2020
- Engelska.
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Ingår i: Metals. - : MDPI AG. - 2075-4701. ; 10:1, s. 01-16
- Relaterad länk:
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https://doi.org/10.3...
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https://hv.diva-port... (primary) (Raw object)
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https://www.mdpi.com...
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https://urn.kb.se/re...
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https://doi.org/10.3...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- The effect of three important process parameters, namely laser power, scanning speed and laser stand-off distance on the deposit geometry, microstructure and segregation characteristics in direct energy deposited alloy 718 specimens has been studied. Laser power and laser stand-off distance were found to notably affect the width and depth of the deposit, while the scanning speed influenced the deposit height. An increase in specific energy conditions (between 0.5 J/mm2 and 1.0 J/mm2) increased the total area of deposit yielding varied grain morphologies and precipitation behaviors which were comprehensively analyzed. A deposit comprising three distinct zones, namely the top, middle and bottom regions, categorized based on the distinct microstructural features formed on account of variation in local solidification conditions. Nb-rich eutectics preferentially segregated in the top region of the deposit (5.4–9.6% area fraction, Af) which predominantly consisted of an equiaxed grain structure, as compared to the middle (1.5–5.7% Af) and the bottom regions (2.6–4.5% Af), where columnar dendritic morphology was observed. High scan speed was more effective in reducing the area fraction of Nb-rich phases in the top and middle regions of the deposit. The <100> crystallographic direction was observed to be the preferred growth direction of columnar grains while equiaxed grains had a random orientation.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Bearbetnings-, yt- och fogningsteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Manufacturing, Surface and Joining Technology (hsv//eng)
Nyckelord
- laser metal deposition (LMD); columnar dendritic morphology; constitutional supercooling; columnar to equiaxed transition (CET); high deposition rate
- Manufacturing and materials engineering
- Produktions- och materialteknik
- Production Technology
- Produktionsteknik
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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