Thermally activated formation of martensite in Fe-C alloys and Fe-17%Cr-C stainless steels during heating from boiling nitrogen temperature

Matteo Villa, Mikkel Fougt Hansen, Marcel A. J. Somers

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

The thermally activated austenite-to-martensite transformation was investigated by magnetometry in three Fe-C alloys and in two 17%Cr stainless steels. After quenching to room temperature, samples were immersed in boiling nitrogen and martensite formation was followed during subsequent (re)heating to room temperature. Different tests were performed applying heating rates from 0.5 K/min to 10 K/min. An additional test consisted in fast (re)heating the samples by immersion in water. Thermally activated martensite formation was demonstrated for all investigated materials by a heating rate-dependent transformation curve. Moreover, magnetometry showed that the heating rate had an influence on the fraction of martensite formed during sub-zero Celsius treatment. The activation energy for thermally activated martensite formation was quantified in the range 11‒21 kJ/mol by a Kissinger-like method.
Original languageEnglish
Title of host publicationProceedings of the 5th Asian Conference on Heat Treatment and Surface Engineering
Number of pages5
PublisherChinese Heat Treatment Society
Publication date2016
Publication statusPublished - 2016
Event5th Asian Conference on Heat Treatment and Surface Engineering - Hangzhou, China
Duration: 12 Nov 201614 Nov 2016

Conference

Conference5th Asian Conference on Heat Treatment and Surface Engineering
CountryChina
CityHangzhou
Period12/11/201614/11/2016

Keywords

  • Martensite
  • Sub-zero Celsius treatments
  • Steel
  • Kinetics of transformation

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