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

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

Journal Article · Mon Dec 08 23:00:00 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.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1188950

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

Journal Information:: Materials, Journal Name: Materials Journal Issue: 12 Vol. 7; ISSN 1996-1944; ISSN MATEG9

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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