Influence of post treatment on microstructure, porosity and mechanical properties of additive manufactured H13 tool steel

Åsberg, MikaelKarlstads universitet,Institutionen för ingenjörsvetenskap och fysik (from 2013) (författare)

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.

TEKNIK OCH TEKNOLOGIER Materialteknik Metallurgi och metalliska material hsv//swe
ENGINEERING AND TECHNOLOGY Materials Engineering Metallurgy and Metallic Materials hsv//eng
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
Materials Science

Fredriksson, Gunnel,1969-Karlstads universitet,Institutionen för ingenjörsvetenskap och fysik (from 2013)(Swepub:kau)gunnelf (författare)
Hatami, SeperhRISE,IVF,Swerea IVF AB (författare)
Fredriksson, W.Bodycote Hot Isostatic Pressing AB, Sweden (författare)
Krakhmalev, Pavel,1973-Karlstads universitet,Institutionen för ingenjörsvetenskap och fysik (from 2013)(Swepub:kau)pavekrak (författare)
Karlstads universitetInstitutionen för ingenjörsvetenskap och fysik (from 2013) (creator_code:org_t)

Ingår i:Materials Science & Engineering: Elsevier BV742, s. 584-5890921-50931873-4936

Av författaren/redakt...: Åsberg, Mikael; Fredriksson, Gun ...; Hatami, Seperh; Fredriksson, W.; Krakhmalev, Pave ...

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TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Materialteknik; och Metallurgi och m ...

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