Next Article in Journal
Microstructure and Mechanical Properties of TiC-Reinforced 316L Stainless Steel Composites Fabricated Using Selective Laser Melting
Previous Article in Journal
Mineralogical Characteristics and Isothermal Oxidation Kinetics of Ironsand Pellets
Previous Article in Special Issue
Transmission of Plasticity Through Grain Boundaries in a Metastable Austenitic Stainless Steel
Article Menu
Issue 2 (February) cover image

Export Article

Open AccessArticle
Metals 2019, 9(2), 266; https://doi.org/10.3390/met9020266

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

1
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing (USTB), Beijing 100083, China
2
Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
3
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)
Full-Text   |   PDF [4516 KB, uploaded 24 February 2019]   |  

Abstract

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
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

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.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Metals EISSN 2075-4701 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top