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Laser powder bed fusion of hot-work tool steel 1.3397 processed at elevated preheating temperatures
RISE Research Institutes of Sweden, Materials and Production, Manufacturing Processes.ORCID iD: 0009-0006-3588-694X
Erasteel Kloster AB, Sweden.
Erasteel Kloster AB, Sweden.
RISE Research Institutes of Sweden, Materials and Production, Manufacturing Processes.
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2021 (English)In: Euro PM2021 Proceedings, 2021Conference paper, Published paper (Refereed)
Abstract [en]

Hot-work tool steel 1.3397 with 0.6 wt% C, 3.9 wt% Cr, 2.0 wt% W and 1.9 % Mo was manufactured by using laser powder bed fusion (LPBF). Early study reported micro-cracks in the as-printed specimens [1], which is a common challenge to additive manufacturing of tool steels containing relatively high carbon. In this work, large cube and bar specimens were produced with the baseplate heated to 400 and 500 ℃ during LPBF to intercept the austenite/martensite transformation and prevent the brittle untempered martensite from forming during LPBF. The as-printed alloy was solution hardened and tempered. It was found that a dendritic/cellular structure with a mixture of untempered martensite and retained austenite was formed. A large number of cracks (~100 μm) were found in the top area of the as-printed 1.3397, due to the shrinkage of the material upon cooling after the printing process. Further approaches to reducing crack are suggested.

Place, publisher, year, edition, pages
2021.
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:ri:diva-58142OAI: oai:DiVA.org:ri-58142DiVA, id: diva2:1626381
Conference
Euro PM2021 Congress. 18-22 October 2021. ONLINE
Available from: 2022-01-11 Created: 2022-01-11 Last updated: 2024-05-21Bibliographically approved

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