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Experimental and theoretical investigations of hot isostatically pressed-produced stainless steel/high alloy tool steel compound materials
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
Swerea KIMAB.
Swerea KIMAB.
Uddeholms AB.
2010 (engelsk)Inngår i: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 42, nr 5, s. 1165-1172Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Consolidation of tool steel powders and simultaneous joining to a stainless 316L steel areperformed by hot isostatic pressing (HIP). Two tool steel grades are considered: a high vanadiumalloyed carbon tool steel, and a high vanadium and chromium alloyed nitrogen tool steel.The boundary layer arising during diffusion bonding is in focus and, in particular, the diffusionof carbon and nitrogen over the joint.Measurements of the elemental concentration profiles andcorrosion tests by the double loop–electrochemical potentiokinetic reactivation (DL-EPR)method are performed. Comparative calculations with the DICTRA software are performedand are found to be in agreement with the experimental results. It is found that the carbon toolsteel grade has a more critical influence on the corrosion resistance of the stainless 316L steel incomparison to the nitrogen tool steel grade.

sted, utgiver, år, opplag, sider
The Minerals, Metals, and Materials Society, 2010. Vol. 42, nr 5, s. 1165-1172
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-103323DOI: 10.1007/s11661-010-0480-3ISI: 000288814700004Scopus ID: 2-s2.0-79954442823OAI: oai:DiVA.org:kth-103323DiVA, id: diva2:559711
Merknad

QC 20121010

Tilgjengelig fra: 2012-10-10 Laget: 2012-10-10 Sist oppdatert: 2024-03-18bibliografisk kontrollert
Inngår i avhandling
1. Multicomponent diffusional reactions in tool steels: Experiment and Theory
Åpne denne publikasjonen i ny fane eller vindu >>Multicomponent diffusional reactions in tool steels: Experiment and Theory
2012 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Many phenomena determining the microstructure of a tool steel and consequently the properties of the material, are governed by multicomponent diffusion. The diffusion driven reactions that take place during, for example, tempering of a hot-work tool steel or when the microstructure develops during hot isostatic pressing of cold-work tool steel, are dependent on the types and amounts of alloying elements. In order for computational methods to be usable, these alloying effects need to be understood and incorporated in the models.

In this work the influence of some typical tool steel alloying elements on the coarsening behavior of precipitates is investigated. Experimental coarsening studies are performed and the impact of the diffusion mobility descriptions and the thermodynamic descriptions are investigated by means of DICTRA coarsening calculations. The kinetic descriptions for diffusion in the body centered-cubic phase in the case of the chromium-iron-vanadium system and the chromium-iron-molybdenum system are improved by assessments of diffusion mobility parameters, and are shown to have a large impact on the calculated coarsening rate for vanadium-rich and molybdenum-rich precipitates.

The effect of cobalt is examined by a coarsening experiment for vanandiumrich carbides and by a diffusion couple experiment for the investigation of the vanadium interdiffusion. The presence of cobalt is experimentally shown to have retarding effect on the coarsening rate of the carbides, but not on the vanadium diffusion.

The coarsening rate of nitrogen-rich precipitates is compared to the coarsening rate of carbon-rich precipitates, and a lower coarsening rate for nitrides compared to carbides can be confirmed. Correlation between coarsening calculations and experiments is obtained suggesting that the thermodynamic description of the two systems is the underlaying reason for the different coarsening rates.

Further, calculations utilizing the DICTRA software are combined with experimental investigations in order to study the possibility to apply computational methods for compound material development and explore application areas for high nitrogen alloyed tool steels produced by powder metallurgy.

sted, utgiver, år, opplag, sider
Stockholm: KTH Royal Institute of Technology, 2012. s. vii, 67
Emneord
hot-work tool steel, precipitation hardening, DICTRA, coarsening, mobilities, CALPHAD, cobalt, PM tool stees, nitrogen, compound materials
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-103328 (URN)978-91-7501-504-0 (ISBN)
Disputas
2012-10-26, B3, Materialvetenskap, Brinellvägen 23, KTH, Stockholm, 10:15 (engelsk)
Opponent
Veileder
Merknad

QC 20121011

Tilgjengelig fra: 2012-10-11 Laget: 2012-10-10 Sist oppdatert: 2022-12-06bibliografisk kontrollert

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