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Studies of oxide reduction during sintering of Cr alloyed PM steel by coupled experimental and diffusion simulations
RISE, Swerea, KIMAB.ORCID iD: 0000-0001-9407-9140
RISE, Swerea, KIMAB.
Höganäs AB, Sweden.
Höganäs AB, Sweden.
2016 (English)In: World PM 2016 Congress and Exhibition, European Powder Metallurgy Association (EPMA) , 2016Conference paper, Published paper (Refereed)
Abstract [en]

Oxide reduction in Cr alloyed PM steel has been simulated experimentally by measuring the oxygen loss from powders when exposed to a heating cycle, by photo acoustic spectroscopy (PAS) and by thermogravimetric analysis (TGA). Pressed samples were heated in dry hydrogen gas using a defined, slow, heating rate up to 1300oC. The oxides in the powder are reduced by the hydrogen gas. From the PAS curves distinct reduction temperatures are observed, that can be correlated to the type of oxide by comparing with thermodynamic calculations of the oxide stabilities. The experimental results were analyzed by diffusion simulations that involve a description of the diffusion controlled oxide reduction. It is shown how the calculated rate of oxygen diffusion in the samples, compared with the experimental results, has been applied as a tool for increased understanding of the reduction during sintering.

Place, publisher, year, edition, pages
European Powder Metallurgy Association (EPMA) , 2016.
Keywords [en]
Acoustic spectroscopy, Chromium alloys, Diffusion, Photoacoustic spectroscopy, Sintering, Thermogravimetric analysis, Diffusion controlled, Dry hydrogen, Heating cycles, Hydrogen gas, Oxide reduction, Oxygen diffusion, Reduction temperatures, Thermodynamic calculations, Powder metallurgy
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-42154Scopus ID: 2-s2.0-85035363260ISBN: 9781899072484 (print)OAI: oai:DiVA.org:ri-42154DiVA, id: diva2:1384372
Conference
World Powder Metallurgy 2016 Congress and Exhibition, World PM 2016, 9 October 2016 through 13 October 2016
Available from: 2020-01-09 Created: 2020-01-09 Last updated: 2020-01-09Bibliographically approved

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