skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Effects of Intercritical Annealing Temperature on Mechanical Properties of Fe-7.9Mn-0.14Si-0.05Al-0.07C Steel

Abstract

A medium Mn steel has been designed to achieve an excellent combination of strength and ductility based on the TRIP (Transformation Induced Plasticity) concept for automotive applications. Following six passes of hot rolling at 850 °C, the Fe-7.9Mn-0.14Si-0.05Al-0.07C (wt.%) steel was warm-rolled at 630 °C for seven passes and subsequently air cooled to room temperature. The sample was subsequently intercritically annealed at various temperatures for 30 min to promote the reverse transformation of martensite into austenite. The obtained results show that the highest volume fraction of austenite is 39% for the sample annealed at 600 °C. This specimen exhibits a yield stress of 910 MPa and a high ultimate tensile stress of 1600 MPa, with an elongation-to-failure of 0.29 at a strain rate of 1 × 10⁻³/s. The enhanced work-hardening ability of the investigated steel is closely related to martensitic transformation and the interaction of dislocations. Especially, the alternate arrangement of acicular ferrite (soft phase) and ultrafine austenite lamellae (50–200 nm, strong and ductile phase) is the key factor contributing to the excellent combination of strength and ductility. On the other hand, the as-warm-rolled sample also exhibits the excellent combination of strength and ductility, with elongation-to-failure much higher than thosemore » annealed at temperatures above 630 °C.« less

Authors:
 [1];  [1];  [1];  [1];  [2];  [1]
  1. Northeastern Univ., Shenyang (China)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1188950
Report Number(s):
PNNL-SA-108028
Journal ID: ISSN 1996-1944; MATEG9; 600306000
Grant/Contract Number:  
AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Materials
Additional Journal Information:
Journal Volume: 7; Journal Issue: 12; Journal ID: ISSN 1996-1944
Publisher:
MDPI
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; medium Mn steel; TRIP effect; austenite; strength; ductility

Citation Formats

Zhao, Xianming, Shen, Yongfeng, Qiu, Lina, Liu, Yandong, Sun, Xin, and Zuo, Liang. Effects of Intercritical Annealing Temperature on Mechanical Properties of Fe-7.9Mn-0.14Si-0.05Al-0.07C Steel. United States: N. p., 2014. Web. https://doi.org/10.3390/ma7127891.
Zhao, Xianming, Shen, Yongfeng, Qiu, Lina, Liu, Yandong, Sun, Xin, & Zuo, Liang. Effects of Intercritical Annealing Temperature on Mechanical Properties of Fe-7.9Mn-0.14Si-0.05Al-0.07C Steel. United States. https://doi.org/10.3390/ma7127891
Zhao, Xianming, Shen, Yongfeng, Qiu, Lina, Liu, Yandong, Sun, Xin, and Zuo, Liang. Tue . "Effects of Intercritical Annealing Temperature on Mechanical Properties of Fe-7.9Mn-0.14Si-0.05Al-0.07C Steel". United States. https://doi.org/10.3390/ma7127891. https://www.osti.gov/servlets/purl/1188950.
@article{osti_1188950,
title = {Effects of Intercritical Annealing Temperature on Mechanical Properties of Fe-7.9Mn-0.14Si-0.05Al-0.07C Steel},
author = {Zhao, Xianming and Shen, Yongfeng and Qiu, Lina and Liu, Yandong and Sun, Xin and Zuo, Liang},
abstractNote = {A medium Mn steel has been designed to achieve an excellent combination of strength and ductility based on the TRIP (Transformation Induced Plasticity) concept for automotive applications. Following six passes of hot rolling at 850 °C, the Fe-7.9Mn-0.14Si-0.05Al-0.07C (wt.%) steel was warm-rolled at 630 °C for seven passes and subsequently air cooled to room temperature. The sample was subsequently intercritically annealed at various temperatures for 30 min to promote the reverse transformation of martensite into austenite. The obtained results show that the highest volume fraction of austenite is 39% for the sample annealed at 600 °C. This specimen exhibits a yield stress of 910 MPa and a high ultimate tensile stress of 1600 MPa, with an elongation-to-failure of 0.29 at a strain rate of 1 × 10⁻³/s. The enhanced work-hardening ability of the investigated steel is closely related to martensitic transformation and the interaction of dislocations. Especially, the alternate arrangement of acicular ferrite (soft phase) and ultrafine austenite lamellae (50–200 nm, strong and ductile phase) is the key factor contributing to the excellent combination of strength and ductility. On the other hand, the as-warm-rolled sample also exhibits the excellent combination of strength and ductility, with elongation-to-failure much higher than those annealed at temperatures above 630 °C.},
doi = {10.3390/ma7127891},
journal = {Materials},
number = 12,
volume = 7,
place = {United States},
year = {2014},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 10 works
Citation information provided by
Web of Science

Save / Share:

Works referenced in this record:

The Developments of Cold-rolled TRIP-assisted Multiphase Steels. Al-alloyed TRIP-assisted Multiphase Steels.
journal, January 2001


Transformation-induced plasticity for high strength formable steels
journal, June 2004


Partitioning of carbon from supersaturated plates of ferrite, with application to steel processing and fundamentals of the bainite transformation
journal, June 2004

  • Speer, John G.; Edmonds, David V.; Rizzo, Fernando C.
  • Current Opinion in Solid State and Materials Science, Vol. 8, Issue 3-4
  • DOI: 10.1016/j.cossms.2004.09.003

Microstructure-based model for the static mechanical behaviour of multiphase steels
journal, April 2006


On the Selection of the Optimal Intercritical Annealing Temperature for Medium Mn TRIP Steel
journal, July 2013

  • Lee, Seawoong; De Cooman, Bruno C.
  • Metallurgical and Materials Transactions A, Vol. 44, Issue 11
  • DOI: 10.1007/s11661-013-1860-2

Austenite stabilization through manganese enrichment
journal, January 2011


Localized Deformation in Multiphase, Ultra-Fine-Grained 6 Pct Mn Transformation-Induced Plasticity Steel
journal, February 2011

  • Lee, Seawoong; Lee, Seok-Jae; Santhosh Kumar, S.
  • Metallurgical and Materials Transactions A, Vol. 42, Issue 12
  • DOI: 10.1007/s11661-011-0636-9

The fracture toughness of TRIP-assisted multiphase steels
journal, September 2008


Multiscale mechanics of TRIP-assisted multiphase steels: I. Characterization and mechanical testing
journal, June 2007


High tensile ductility in a nanostructured metal
journal, October 2002

  • Wang, Yinmin; Chen, Mingwei; Zhou, Fenghua
  • Nature, Vol. 419, Issue 6910
  • DOI: 10.1038/nature01133

Tensile properties of copper with nano-scale twins
journal, May 2005


Ultrahigh Strength and High Electrical Conductivity in Copper
journal, April 2004


Revealing the Maximum Strength in Nanotwinned Copper
journal, January 2009


A micro-alloyed ferritic steel strengthened by nanoscale precipitates
journal, October 2011


Effect of microstructure on retained austenite stability and work hardening of TRIP steels
journal, May 2011

  • Chiang, J.; Lawrence, B.; Boyd, J. D.
  • Materials Science and Engineering: A, Vol. 528, Issue 13-14
  • DOI: 10.1016/j.msea.2011.02.032

Microstructure, tensile and toughness properties after quenching and partitioning treatments of a medium-carbon steel
journal, January 2013

  • Paravicini Bagliani, E.; Santofimia, M. J.; Zhao, L.
  • Materials Science and Engineering: A, Vol. 559
  • DOI: 10.1016/j.msea.2012.08.130

Study of TRIP-Aided Bainitic Ferritic Steels Produced by Hot Press Forming
journal, January 2014

  • Chen, Shangping; Rana, Radhakanta; Lahaije, Chris
  • Metallurgical and Materials Transactions A, Vol. 45, Issue 4
  • DOI: 10.1007/s11661-013-2163-3

Effect of Retained Austenite on the Fracture Toughness of Quenching and Partitioning (Q&P)-Treated Sheet Steels
journal, November 2013


The effect of morphology on the stability of retained austenite in a quenched and partitioned steel
journal, March 2013


Improved ductility of a transformation-induced-plasticity steel by nanoscale austenite lamellae
journal, October 2013


Lattice parameters of iron-carbon and iron-nitrogen martensites and austenites
journal, March 1990


Carbon partitioning into austenite after martensite transformation
journal, May 2003


On the Low Temperature Strain Aging of Bainite in the TRIP Steel
journal, July 2013

  • Timokhina, Ilana; Beladi, Hossein; Xiong, Xiang-Yuan
  • Metallurgical and Materials Transactions A, Vol. 44, Issue 11
  • DOI: 10.1007/s11661-013-1864-y

Origin of intergranular fracture in martensitic 8Mn steel at cryogenic temperatures
journal, September 2013


Stress-assisted isothermal martensitic transformation: Application to TRIP steels
journal, November 1982

  • Olson, G. B.; Cohen, Morris
  • Metallurgical Transactions A, Vol. 13, Issue 11
  • DOI: 10.1007/BF02645934

On the sources of work hardening in multiphase steels assisted by transformation-induced plasticity
journal, July 2001


Deformation-induced austenite grain rotation and transformation in TRIP-assisted steel
journal, February 2012


Microstructures and yield strength of nitrogen alloyed super duplex steels
journal, April 1997


Tensile behaviors of IF steel with different cold-rolling reductions
journal, November 2008


Transformation behavior of TRIP steels
journal, May 1978

  • Olson, G. B.; Azrin, M.
  • Metallurgical Transactions A, Vol. 9, Issue 5
  • DOI: 10.1007/BF02659928

Effects of cold rolling on microstructure and mechanical properties of Fe–30Mn–3Si–4Al–0.093C TWIP steel
journal, January 2013


    Works referencing / citing this record:

    The Role of Transformation-Induced Plasticity in the Development of Advanced High Strength Steels
    journal, March 2018

    • Liu, Li; He, Binbin; Huang, Mingxin
    • Advanced Engineering Materials, Vol. 20, Issue 6
    • DOI: 10.1002/adem.201701083

    The TRIP Effect and Its Application in Cold Formable Sheet Steels: The TRIP Effect and Its Application in Cold Formable
    journal, August 2017

    • Bleck, Wolfgang; Guo, Xiaofei; Ma, Yan
    • steel research international, Vol. 88, Issue 10
    • DOI: 10.1002/srin.201700218

    Influence of pre-strain on microstructural characteristics and tensile deformation behaviour of a cold-rolled Al-containing medium Mn steel
    journal, January 2020


    Analysis of medium manganese steel through cold-rolling and intercritical annealing or warm-rolling
    journal, April 2018

    • Magalhães, Aline Silva; dos Santos, Carlos Eduardo; Ferreira, Aline Oliveira Vasconcelos
    • Materials Science and Technology, Vol. 35, Issue 17
    • DOI: 10.1080/02670836.2018.1463613

    A medium-Mn steel processed by novel twin-roll strip casting route
    journal, May 2019


    Microstructure and Mechanical Properties of Hot- Rolled and Cold-Rolled Medium-Mn TRIP Steels
    journal, November 2018

    • Liu, Chunquan; Peng, Qichun; Xue, Zhengliang
    • Materials, Vol. 11, Issue 11
    • DOI: 10.3390/ma11112242

    Microstructure-Tensile Properties Relationship and Austenite Stability of a Nb-Mo Micro-Alloyed Medium-Mn TRIP Steel
    journal, August 2018

    • Liu, Chunquan; Peng, Qichun; Xue, Zhengliang
    • Metals, Vol. 8, Issue 8
    • DOI: 10.3390/met8080615