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Evaluation of post-treatments of novel hot-work tool steel manufactured by laser powder bed fusion for aluminum die casting applications
Karlstad University, Sweden.
RISE Research Institutes of Sweden, Materials and Production.ORCID iD: 0000-0001-9288-3872
Karlstad University, Sweden.
RISE Research Institutes of Sweden, Materials and Production, Manufacturing Processes.
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2021 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 800, article id 140305Article in journal (Refereed) Published
Abstract [en]

Additive manufacturing is a good alternative to conventional methods for the production of near net shape geometries with high geometric complexity shorter lead times, being a good option for the manufacturing of dies for die casting process. In this research, a novel hot-work tool steel for aluminum die casting applications manufactured by laser powder bed fusion was investigated. As-built and stress-relieved (AS-B + SR) state was established and used as the reference condition, and subsequent post-treatments were added and compared to the reference condition. Test parts were evaluated using tensile, impact, hardness and thermal fatigue testing. Compared to the reference condition, heat treatment (HT), significantly increased the hardness, yield and ultimate tensile strengths of the material, due to the obtained tempered martensite microstructure. Hot isostatic pressing (HIP) prior to HT significantly increased the impact toughness and ductility, and slightly increased the yield and ultimate tensile strength values compared to the HT condition. The addition of nitriding treatment after HT, without intermedium HIP step, resulted in the highest surface hardness and lowest impact toughness. Thermal fatigue was mostly affected by the hardness and the softening of the material during the thermal fatigue testing. Results showed that a high surface hardness resulted in a higher thermal fatigue crack nucleation, meanwhile conditions with a high softening during thermal fatigue performance resulted in a higher crack propagation.

Place, publisher, year, edition, pages
Elsevier Ltd , 2021. Vol. 800, article id 140305
Keywords [en]
Die casting, Heat treatment, Hot-work tool steels, Laser powder bed fusion, Nitriding, Thermal fatigue, 3D printers, Aluminum coated steel, Aluminum nitride, Crack propagation, Dies, Fatigue testing, Fracture toughness, Hardness, Hot isostatic pressing, Hot working, Tensile strength, Tensile testing, Tool steel, Tools, Aluminum die casting, Conventional methods, Die casting process, Geometric complexity, Hot-work tool steel, Tempered martensite, Thermal fatigue cracks, Ultimate tensile strength, Cracks
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Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-49461DOI: 10.1016/j.msea.2020.140305Scopus ID: 2-s2.0-85091555667OAI: oai:DiVA.org:ri-49461DiVA, id: diva2:1492893
Note

Export Date: 16 October 2020; Article; Funding details: Tillväxtverket; Funding text 1: Authors thank the Swedish Agency for Economic and Regional Growth , Grant No20201144 , ATLAB - additive manufacturing laboratory at Karlstad University, and Region Värmland for financial support. RISE IVF AB (formerly Swerea IVF) is also acknowledged for the research funding as well as the Additive Manufacturing Research Laboratory (AMRL) at RISE IVF who provided support regarding printing of the specimens.

Available from: 2020-11-03 Created: 2020-11-03 Last updated: 2023-06-08Bibliographically approved

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Hosseini, Seyed

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