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Influence of post treatment on microstructure, porosity and mechanical properties of additive manufactured H13 tool steel
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013).ORCID iD: 0000-0001-6851-6319
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013).
Swerea IVF AB.
Bodycote Hot Isostatic Pressing.
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2019 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 742, p. 584-589Article in journal (Refereed) Published
Abstract [en]

Additive manufacturing (AM) is an attractive manufacturing technology in tooling applications. It provides unique opportunities to manufacture tools with complex shapes, containing inner channels for conformal cooling. In this investigation, H13, a widely used tool steel, was manufactured using a laser powder bed fusion method. Microstructure, tensile mechanical properties, hardness, and porosity of the AM H13 after stress relieve (SR), standard hardening and tempering (SR + HT), and hot isostatic pressing (SR + HIP + HT) were investigated. It was found that the microstructure of directly solidified colonies of prior austenite, which is typical for AM, disappeared after austenitizing at the hardening heat treatment. In specimens SR + HT and SR + HIP + HT, a microstructure similar to the conventional but finer was observed. Electron microscopy showed that SR and SR + HT specimens contained lack of fusion, and spherical gas porosity, which resulted in remarkable scatter in the observed elongation to break values. Application of HIP resulted in the highest strength values, higher than those observed for conventional H13 heat treated in the same way. The conclusion is that HIP promotes reduction of porosity and lack of fusion defects and can be efficiently used to improve the mechanical properties of AM H13 tool steel.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 742, p. 584-589
Keywords [en]
Additive manufacturing, Hot work tool steel H13, Laser powder bed fusion, Mechanical properties, Post treatment, 3D printers, Hardening, Hot isostatic pressing, Hot working, Microstructure, Porosity, Tool steel, Tools, Elongation to break, H-13 tool steels, Hot-work tool steel, Laser powders, Manufacturing technologies, Strength values, Tensile mechanical properties
National Category
Metallurgy and Metallic Materials
Research subject
Materials Science
Identifiers
URN: urn:nbn:se:kau:diva-70411DOI: 10.1016/j.msea.2018.08.046ISI: 000457814400060Scopus ID: 2-s2.0-85056673446OAI: oai:DiVA.org:kau-70411DiVA, id: diva2:1268207
Available from: 2018-12-05 Created: 2018-12-05 Last updated: 2019-02-21Bibliographically approved

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Åsberg, MikaelFredriksson, GunnelKrakhmalev, Pavel

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