Thermally activated martensite formation in ferrous alloys. (1st January 2018)

• Record Type: Journal Article
• Authors: Villa, Matteo; Somers, Marcel A.J.
• Is Part Of: Scripta materialia. Number 142(2018)
• Page Start: 46
• Page End: 49
• Publication Date: 2018-01-01
• Subjects: Martensitic phase transformations -- Steel -- Kinetics; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2017.08.024
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Magnetometry was applied to investigate the formation of α / α ´ martensite in 13 ferrous alloys during immersion in boiling nitrogen and during re-heating to room temperature at controlled heating rates in the range 0.0083–0.83 K s − 1 . Data shows that in 3 of the alloys, those that form {5 5 7}γ martensite, no martensite develops during cooling. For all investigated alloys, irrespective of the type of martensite forming, thermally activated martensite develops during heating . The activation energy for thermally activated martensite formation is in the range 8–27 kJ mol − 1 and increases with the fraction of interstitial solutes in the alloy. Graphical abstract: