The initial microstructure, its local composition and phase morphology determines the final microstructure in ultra fast heat treatment processes (UFHT). In the present study, we designed and performed, via dilatometry, UFHT processes involving heating rates higher than 250°C/s, peak austenitization and helium quenching. This UFHT leads to a carbon gradient within the austenite, as confirmed by thermodynamic and diffusion calculations. With microscopic techniques we shed light on the microstructure evolution of steels with different compositions and initial microstructures. The most commonly achieved microstructure from UFHT in medium-carbon-steels is a mixture of fine bainite and martensite. Partially dissolved cementite, carbides and other microstructural features could be identified as similar to the original, even after UFHT.

Original languageEnglish
Title of host publicationPTM 2015 - Proceedings of the International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015
EditorsL.-Q. Chen, M. Militzer, G. Botton et al
PublisherInternational Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015
Pages569-570
ISBN (Electronic)9780692437360
Publication statusPublished - 2015
EventInternational Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015, PTM 2015 - Whistler, Canada
Duration: 28 Jun 20153 Jul 2015

Conference

ConferenceInternational Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015, PTM 2015
Abbreviated titlePTM 2015
CountryCanada
CityWhistler
Period28/06/153/07/15

    Research areas

  • Diffusion, Martensite, Ultra fast heat treatment

ID: 9913681