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Characteristics of a modified H13 hot-work tool steel fabricated by means of laser beam powder bed fusion
Chalmers University of Technology, Sweden.
Chalmers University of Technology, Sweden; Central South University, China.
Uddeholms AB, Sweden.
RISE Research Institutes of Sweden, Materials and Production, Manufacturing Processes. Chalmers University of Technology, Sweden.ORCID iD: 0000-0001-9288-3872
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2022 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 831, article id 142322Article in journal (Refereed) Published
Abstract [en]

In the present study, a modified H13 hot-work tool steel (M-H13) was fabricated by laser beam powder bed fusion (LB-PBF). The effect of two types of post processing, direct tempering from as-built condition (DT) and conventional quenching followed by tempering (QT), on the microstructure and mechanical properties was evaluated. The typical microstructure in QT condition was tempered martensite with carbides along lath boundaries. In DT condition, melt pool boundaries and cellular structure from as-built condition were still observed. While comparable tensile properties and hardness were obtained, DT samples exhibited significantly lower impact toughness compared to QT samples. This was attributed to the difference in work hardening ability and strain rate sensitivity originating from different microstructures obtained under these two heat treatment conditions. The study was also focused on the softening behavior and the correlation with the microstructure of the two post treatments at the elevated temperatures. It was found that the DT samples showed lower thermal softening compared to QT samples. The evolution of carbides was discussed based on the microanalysis results and the JMatPro simulation. © 2021 The Authors

Place, publisher, year, edition, pages
Elsevier Ltd , 2022. Vol. 831, article id 142322
Keywords [en]
Additive manufacturing, Heat treatment, Mechanical properties, Softening resistance, Tool steel, 3D printers, Carbides, Fabrication, Heat resistance, Hot working, Laser beams, Microstructure, Strain hardening, Strain rate, Tempering, Tools, Condition, Conventional quenching, Hot-work tool steel, Lath boundary, Melt pool, Microstructures and mechanical properties, Post-processing, Powder bed, Tempered martensite
National Category
Manufacturing, Surface and Joining Technology
Identifiers
URN: urn:nbn:se:ri:diva-57920DOI: 10.1016/j.msea.2021.142322Scopus ID: 2-s2.0-85119341570OAI: oai:DiVA.org:ri-57920DiVA, id: diva2:1626618
Note

 Funding details: VINNOVA, 2016–03305; Funding details: Chalmers Tekniska Högskola; Funding details: China Scholarship Council, CSC; Funding text 1: This study is supported by Vinnova (Sweden's Innovation Agency) No. 2016–03305 , China Scholarship Council ( CSC ) and Production Area of Advance, Chalmers University of Technology, Sweden .

Available from: 2022-01-11 Created: 2022-01-11 Last updated: 2023-06-08Bibliographically approved

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