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Design and characte...
Design and characterization of a cobalt-free stainless maraging steel for laser-based powder bed fusion
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- Riabov, Dmitri, 1990 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Frisk, Karin, 1961 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Thuvander, Mattias, 1968 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Hryha, Eduard, 1980 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Bengtsson, S. (author)
- Höganäs AB
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(creator_code:org_t)
- Elsevier BV, 2022
- 2022
- English.
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In: Materials and Design. - : Elsevier BV. - 1873-4197 .- 0264-1275. ; 223
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https://research.cha... (primary) (free)
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https://research.cha...
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https://doi.org/10.1...
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Abstract
Subject headings
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- This study presents a new Co-free stainless maraging variant for laser-based powder bed fusion developed using a computational alloy design approach. The goal was to develop an easily printable material with similar performance to 18Ni-300. After screening numerous compositions, Fe-13.2Cr-9.1Ni-1.1Al-0.6Mo-0.5Nb-0.23Ti-0.5Mn-0.5Si (wt.%) was selected. This composition showed excellent printability with low porosity levels. The precipitation strengthening response was evaluated by aging at 500 °C for 15 min, 3 h and 18 h, measuring hardness, tensile strength, and by characterization using atom probe tomography. After 15 min of aging, 90% of the maximum hardness was reached, thanks to formation of (Ni, Al, Nb, Ti, Mn, Si) clusters with a density of 1.5 × 1024 m-3. Between 15 min and 3 h, distinct precipitates formed with a radius of ∼1.4 nm. The precipitates underwent a splitting phenomenon after 18 h, forming several unique Ni-rich precipitates including Ni16Si7(Ti, Nb)6 and Ni3(Al, Ti, Nb, Si). The splitting can be a reason for the slow coarsening rate, as the average precipitate radius after 18 h was only 2 nm. Simulations of the precipitation sequence using PRISMA indicated very rapid and dense precipitation of L12-Ni3X precipitates with a slow coarsening rate, in agreement with experimental observations.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Bearbetnings-, yt- och fogningsteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Manufacturing, Surface and Joining Technology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Metallurgi och metalliska material (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Metallurgy and Metallic Materials (hsv//eng)
Keyword
- Precipitates
- Alloy design
- LB-PBF
- Maraging
- Additive
- APT
Publication and Content Type
- art (subject category)
- ref (subject category)
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