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Metals 2019, 9(2), 266;

Effects of Heating Rate on Formation of Globular and Acicular Austenite during Reversion from Martensite

School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing (USTB), Beijing 100083, China
Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
Steel Research Laboratory, JFE Steel Corporation, 1 Kawasaki-cho, Chuo-ku, Chiba 260-0835, Japan
Author to whom correspondence should be addressed.
Received: 29 January 2019 / Revised: 19 February 2019 / Accepted: 20 February 2019 / Published: 24 February 2019
(This article belongs to the Special Issue TRIP Steels)
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The effects of heating rate on the formation of acicular and globular austenite during reversion from martensite in Fe–2Mn–1.5Si–0.3C alloy have been investigated. It was found that a low heating rate enhanced the formation of acicular austenite, while a high heating rate favored the formation of globular austenite. The growth of acicular γ was accompanied by the partitioning of Mn and Si, while the growth of globular γ was partitionless. DICTRA simulation revealed that there was a transition in growth mode from partitioning to partitionless for the globular austenite with an increase in temperature at high heating rate. High heating rates promoted a reversion that occurred at high temperatures, which made the partitionless growth of globular austenite occur more easily. On the other hand, the severer Mn enrichment into austenite at low heating rate caused Mn depletion in the martensite matrix, which decelerated the reversion kinetics in the later stage and suppressed the formation of globular austenite. View Full-Text
Keywords: austenite reversion; heating rate; morphology; kinetics; interface mobility austenite reversion; heating rate; morphology; kinetics; interface mobility

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Zhang, X.; Miyamoto, G.; Toji, Y.; Furuhara, T. Effects of Heating Rate on Formation of Globular and Acicular Austenite during Reversion from Martensite. Metals 2019, 9, 266.

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