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Technical Briefs

Dynamic Restoration Processes in High-Mn TWIP Steels

[+] Author and Article Information
M. Sabet1

School of Metallurgical and Materials Engineering, University of Tehran, Tehran, Iranmsabet@ut.ac.ir

A. Zarei-Hanzaki

School of Metallurgical and Materials Engineering, University of Tehran, Tehran, Iran

Sh. Khoddam

Department of Mechanical and Aerospace Engineering, Monash University, Clayton, VIC 3800, Australia

1

Corresponding author.

J. Eng. Mater. Technol 131(4), 044502 (Sep 09, 2009) (5 pages) doi:10.1115/1.3120394 History: Received October 04, 2008; Revised March 22, 2009; Published September 09, 2009

The twinning-induced plasticity (TWIP) phenomenon is established as the most effective mechanism to enhance the formability of the advanced high-Mn (15–30 wt %) austenitic steels (known as TWIP steels). As the formability is very sensitive to the steel microstructure, the study of their hot deformation characteristics is highly desired. The aim of the present work is to investigate the effects of strain rate on the high temperature flow behavior, dynamic recrystallization (DRX) and the microstructural evolution of a grade of TWIP steels (with 29 wt % Mn) through single hit compression testing. The hot compression tests were carried out at two different temperatures (850°C and 1150°C) applying a range of strain rates (0.0010.1s1). The results indicated a greater deformation resistance at higher strain rates. The detected broad stress peaks at higher strain rates were related to the occurrence of DRX. The microstructural studies revealed that, in addition to DRX, a geometrical dynamic recrystallization occurred at 850°C. This results in a microstructure with finer equiaxed grains.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

The microstructure of specimen annealed at 1100°C for 45 min

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Figure 2

The true stress-strain curves of the experimental steel at (a) 850°C and (b) 1150°C

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Figure 3

The microstructures of the deformed specimens at (a) 0.001 s−1, (b) 0.01 s−1, and (c) 0.1 s−1 (T=850°C, ε=0.7)

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Figure 4

The microstructures of the deformed specimens at (a) 0.001 s−1, (b) 0.01 s−1, and (c) 0.1 s−1 (T=1150°C, ε=0.7)

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Figure 5

Microstructural evolution of the hot deformed specimen at (a) ε=0.02, (b) ε=0.3, and (c) ε=0.7 (T=850°C, ε̇=0.01 s−1)

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Figure 6

Microstructural evolution of the hot deformed specimen at (a) ε=0.02, (b) ε=0.3, and (c) ε=0.7 (T=1150°C, ε̇=0.01 s−1)

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Figure 7

The microstructures of the deformed specimens at (a) 850°C/0.1 s−1 and (b) 850°C/0.001 s−1(ε=0.7)

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Figure 8

The microstructures of the deformed specimen at 1150°C/0.1 s−1(ε=0.7)

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Figure 9

The variation in work hardening rate (θ) with flow stress at (a) 850°C and (b) 1150°C

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