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Title: Correlation between mechanical properties and retained austenite characteristics in a low-carbon medium manganese alloyed steel plate

The effects of retained austenite characteristics on tensile properties and low-temperature impact toughness have been investigated by means of transmission electron microscopy and X-ray diffraction. It was found that only part of austenite phase formed during heat treating was left at room temperature. Moreover, the film-like retained austenite is displayed between bcc-martensite laths after heat treating at 600 °C, while the block-form retained austenite with thin hcp-martensite laths is observed after heat treating at 650 °C. It has been demonstrated that the film-like retained austenite possesses relatively high thermal and mechanical stability, and it can greatly improve low-temperature impact toughness, but its contribution to strain hardening capacity is limited. However, the block-form retained austenite can greatly enhance ultimate tensile strength and strain hardening capacity, but its contribution to low-temperature impact toughness is poor. - Highlights: • Correlation between retained austenite and impact toughness was elucidated. • The impact toughness is related to mechanical stability of retained austenite. • The effect of retained austenite on tensile and impact properties is inconsistent.
Authors:
 [1] ;  [2] ; ; ;  [1]
  1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819 (China)
  2. School of Materials and Metallurgy, Northeastern University, Shenyang 110819 (China)
Publication Date:
OSTI Identifier:
22476128
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 106; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AFTER-HEAT; AUSTENITE; BCC LATTICES; CORRELATIONS; HCP LATTICES; MANGANESE STEELS; MARTENSITE; STABILITY; STRAIN HARDENING; TEMPERATURE RANGE 0273-0400 K; TEMPERATURE RANGE 0400-1000 K; TENSILE PROPERTIES; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION