Christiansen, Thomas L.

Hansen , Mikkel F.

Somers, Marcel A. J.

Villa, Matteo

he austenite-to-martensite transformation at temperatures below room temperature was investigated in situ by magnetometry in Fe-N, Fe-Cr-C and Fe-Cr-Ni based alloys. After quenching to room temperature, samples were immersed in boiling nitrogen and martensite formation was followed during subsequent heating to room temperature. Different tests were performed with heating rates ranging from 0.5 K/min to 10 K/min. For comparison a sample was up-quenched in water to verify whether martensite formation can be suppressed at high heating rates. Thermally activated formation of martensite during heating was convincingly demonstrated for all investigated materials by showing heating rate dependent transformation kinetics. Moreover, magnetometry showed that the heating rate influences the fraction of martensite formed during the thermal treatment. The activation energy for thermally activated martensite formation as quantified by a Kissinger-like method lies in the range 11‒18 kJ/mol and increases with the total fraction of interstitials in the alloy

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Investigation of Martensite Formation in Fe Based Alloys During Heating From BoilingNitrogen Temperature - DTU Orbit (08/11/2017) Investigation of Martensite Formation in Fe Based Alloys During Heating From Boiling Nitrogen Temperaturehe austenite-to-martensite transformation at temperatures below room temperature was investigated in situ bymagnetometry in Fe-N, Fe-Cr-C and Fe-Cr-Ni based alloys. After quenching to room temperature, samples wereimmersed in boiling nitrogen and martensite formation was followed during subsequent heating to room temperature.Different tests were performed with heating rates ranging from 0.5 K/min to 10 K/min. For comparison a sample was up-quenched in water to verify whether martensite formation can be suppressed at high heating rates. Thermally activatedformation of martensite during heating was convincingly demonstrated for all investigated materials by showing heatingrate dependent transformation kinetics. Moreover, magnetometry showed that the heating rate influences the fraction ofmartensite formed during the thermal treatment. The activation energy for thermally activated martensite formation asquantified by a Kissinger-like method lies in the range 11‒18 kJ/mol and increases with the total fraction of interstitials inthe alloy. General informationState: PublishedOrganisations: Department of Mechanical Engineering, Materials and Surface Engineering, Technical University ofDenmarkAuthors: Villa, M. (Intern), Christiansen, T. L. (Intern), Hansen , M. F. (Ekstern), Somers, M. A. J. (Intern)Pages: 39-46Publication date: 2015Main Research Area: Technical/natural sciences Publication informationJournal: La Metallurgia ItalianaVolume: 11Issue number: 12ISSN (Print): 0026-0843Ratings: BFI (2017): BFI-level 1 Web of Science (2017): Indexed Yes BFI (2016): BFI-level 1 Scopus rating (2016): SJR 0.184 SNIP 0.28 CiteScore 0.29 BFI (2015): BFI-level 1 Scopus rating (2015): SJR 0.177 SNIP 0.237 CiteScore 0.23 Web of Science (2015): Indexed yes BFI (2014): BFI-level 1 Scopus rating (2014): SJR 0.194 SNIP 0.441 CiteScore 0.3 BFI (2013): BFI-level 1 Scopus rating (2013): SJR 0.176 SNIP 0.139 CiteScore 0.19 BFI (2012): BFI-level 1 Scopus rating (2012): SJR 0.171 SNIP 0.41 CiteScore 0.17 BFI (2011): BFI-level 1 Scopus rating (2011): SJR 0.12 SNIP 0.314 CiteScore 0.11 BFI (2010): BFI-level 1 Scopus rating (2010): SJR 0.136 SNIP 0.045 BFI (2009): BFI-level 1 Scopus rating (2009): SJR 0.121 SNIP 0.176 BFI (2008): BFI-level 1 Scopus rating (2008): SJR 0.128 SNIP 0.15 Scopus rating (2007): SJR 0.104 SNIP 0.203 Scopus rating (2006): SJR 0.114 SNIP 0.022 Scopus rating (2005): SJR 0.126 SNIP 0.067 Web of Science (2005): Indexed yes Scopus rating (2004): SJR 0.121 SNIP 0.009 Scopus rating (2003): SJR 0.14 SNIP 0.016 Scopus rating (2002): SJR 0.16 SNIP 0.063 Scopus rating (2001): SJR 0.143 SNIP 0.245 Scopus rating (2000): SJR 0.138 SNIP 0.351 Scopus rating (1999): SJR 0.155 SNIP 0.148 Original language: EnglishMartensite, Steel, Cryogenic treatment, Kinetics of transformations, MagnetometryElectronic versions: INVESTIGATION_OF_MARTENSITE_FORMATION_IN_FE_BASED_ALLOYS_DURING_HEATING_FROM_BOILING_NITROGEN_TEMPERATURE.pdf  Bibliographical noteThis journal provides immediate open access to its content on the principle that making research freely available to thepublic supports a greater global exchange of knowledge.Source: PublicationPreSubmissionSource-ID: 117049525Publication: Research - peer-review › Journal article – Annual report year: 2015 

Investigation of Martensite Formation in Fe Based Alloys During Heating From Boiling Nitrogen Temperature

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Investigation of Martensite Formation in Fe Based Alloys During Heating From Boiling Nitrogen Temperature

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