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 »
- Authors:
-
- Northeastern Univ., Shenyang (China)
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Publication Date:
- Research Org.:
- Pacific Northwest National Laboratory (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. doi: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}
}
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A micro-alloyed ferritic steel strengthened by nanoscale precipitates
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Microstructure, tensile and toughness properties after quenching and partitioning treatments of a medium-carbon steel
journal, January 2013
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Effects of cold rolling on microstructure and mechanical properties of Fe–30Mn–3Si–4Al–0.093C TWIP steel
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Improved ductility of a transformation-induced-plasticity steel by nanoscale austenite lamellae
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Works referencing / citing this record:
The Role of Transformation-Induced Plasticity in the Development of Advanced High Strength Steels
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