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

Zhao, Xianming; Shen, Yongfeng; Qiu, Lina; Liu, Yandong; Sun, Xin; Zuo, Liang

doi:10.3390/ma7127891

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

Journal Article · Tue Dec 09 00:00:00 EST 2014 · Materials

DOI:https://doi.org/10.3390/ma7127891· OSTI ID:1188950

Zhao, Xianming ^[1]; Shen, Yongfeng ^[1]; Qiu, Lina ^[1]; Liu, Yandong ^[1]; Sun, Xin ^[2]; Zuo, Liang ^[1]

Northeastern Univ., Shenyang (China)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

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.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1188950

Report Number(s):: PNNL-SA-108028; MATEG9; 600306000

Journal Information:: Materials, Vol. 7, Issue 12; ISSN 1996-1944

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 48 works

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The TRIP Effect and Its Application in Cold Formable Sheet Steels: The TRIP Effect and Its Application in Cold Formable Bleck, Wolfgang; Guo, Xiaofei; Ma, Yan steel research international, Vol. 88, Issue 10 https://doi.org/10.1002/srin.201700218	journal	August 2017
Influence of pre-strain on microstructural characteristics and tensile deformation behaviour of a cold-rolled Al-containing medium Mn steel Wang, Jiao-Jiao; Hui, Wei-jun; Xie, Zhi-qi Journal of Materials Science, Vol. 55, Issue 12 https://doi.org/10.1007/s10853-019-04337-3	journal	January 2020
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