Influence of heat treatment under hot isostatic pressing (HIP) on microstructure of intermetallic-reinforced tool steel manufactured by laser powder bed fusion

Krakhmalev, Pavel,1973-Karlstads universitet,Institutionen för ingenjörsvetenskap och fysik (from 2013) (author)

Microstructure and properties of as-built laser powder bed fusion (LPBF) steels differ from the conventional ones, and they may contain some porosity and lack of fusion. Therefore, post-treatments, including hot isostatic pressing (HIP), are used to density the material, and tailor the properties of the final product. Usually, HIP is performed as an operation separate from heat treatment. In the present investigation a new approach was used, in which the whole cycle of the heat treatment was carried out in HIP under pressure, and the influence of HIP on microstructure of an advanced stainless maraging tool steel manufactured by LPBF was investigated. For a comparison, a conventional steel grade of the same chemical composition, after a heat treatment at the same temperature-time conditions, was also characterized. The microstructure of the steel was investigated by means of advanced microscopy and atom probe tomography. The influence of the manufacturing route, heat treatment and HIP on microstructure, austenitic phase fraction and size distribution of precipitates was investigated, and the role of high pressure in stabilization of austenite in the microstructure was discussed. It was concluded that since HIP influences phase transformations, a fundamental understanding of the influence of HIP on microstructure is nececcary, and development of new post processing regimes guaranteeing the best performance of the material is required.

Fredriksson, Gunnel,1969-Karlstads universitet,Institutionen för ingenjörsvetenskap och fysik (from 2013),Karlstad Univ, SE-65188 Karlstad, Sweden.(Swepub:kau)gunnelf (author)
Thuvander, Mattias,1968Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)matthu (author)
Åsberg, MikaelKarlstads universitet,Institutionen för ingenjörsvetenskap och fysik (from 2013)(Swepub:kau)mikaasbe (author)
Martin Vilardell, AnnaKarlstads universitet,Institutionen för ingenjörsvetenskap och fysik (from 2013)(Swepub:kau)annavila (author)
Oikonomou, C.Uddeholms AB, Sweden (author)
Maistro, G.Uddeholms AB, Sweden (author)
Medvedeva, A.Uddeholms AB, Sweden (author)
Kazantseva, N.Russian Academy of Sciences,Institute of Metal Physics UB RAS, Russia (author)
Karlstads universitetInstitutionen för ingenjörsvetenskap och fysik (from 2013) (creator_code:org_t)

In:Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing: Elsevier BV7720921-50931873-4936

By the author/editor: Krakhmalev, Pave ...; Fredriksson, Gun ...; Thuvander, Matti ...; Åsberg, Mikael; Martin Vilardell ...; Oikonomou, C.; show more...; Maistro, G.; Medvedeva, A.; Kazantseva, N.; show less...

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Materials Engine ...; and Manufacturing Su ...

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Materials Engine ...; and Other Materials ...

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Materials Engine ...; and Metallurgy and M ...

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.