Effect of continuous annealing temperature on microstructure and properties of ferritic rolled interstitial-free steel

Chen-yang Qiu; Lang Li; Lei-lei Hao; Jian-gong Wang; Xun Zhou; Yong-lin Kang

doi:10.1007/s12613-018-1600-0

Volume 25 Issue 5

May 2018

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2018 > 25(5): 536-546

Chen-yang Qiu, Lang Li, Lei-lei Hao, Jian-gong Wang, Xun Zhou, and Yong-lin Kang, Effect of continuous annealing temperature on microstructure and properties of ferritic rolled interstitial-free steel, Int. J. Miner. Metall. Mater., 25(2018), No. 5, pp. 536-546. https://doi.org/10.1007/s12613-018-1600-0

Cite this article as:

Chen-yang Qiu, Lang Li, Lei-lei Hao, Jian-gong Wang, Xun Zhou, and Yong-lin Kang, Effect of continuous annealing temperature on microstructure and properties of ferritic rolled interstitial-free steel, Int. J. Miner. Metall. Mater., 25(2018), No. 5, pp. 536-546. https://doi.org/10.1007/s12613-018-1600-0

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Research Article

Effect of continuous annealing temperature on microstructure and properties of ferritic rolled interstitial-free steel

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Corresponding author:
Yong-lin Kang E-mail: kangylin@ustb.edu.cn
Received: 10 August 2017; Revised: 25 December 2017; Accepted: 26 December 2017

Abstract

Abstract

In this report, the microstructure, mechanical properties, and textures of warm rolled interstitial-free steel annealed at four different temperatures (730, 760, 790, and 820℃) were studied. The overall structural features of specimens were investigated by optical microscopy, and the textures were measured by X-ray diffraction (XRD). Nano-sized precipitates were then observed by a transmission electron microscope (TEM) on carbon extraction replicas. According to the results, with increased annealing temperatures, the ferrite grains grew; in addition, the sizes of Ti₄C₂S₂ and TiC precipitates also increased. Additionally, the sizes of TiN and TiS precipitates slightly changed. When the annealing temperature increased from 730 to 820℃, the yield strength (YS) and the ultimate tensile strength (UTS) showed a decreasing trend. Meanwhile, elongation and the strain harden exponent (n value) increased to 49.6% and 0.34, respectively. By comparing textures annealed at different temperatures, the intensity of {111} texture annealed at 820℃ was the largest, while the difference between the intensity of {111}<110> and {111}<112> was the smallest when the annealing temperature was 820℃. Therefore, the plastic strain ratio (r value) annealed at 820℃ was the highest.
- interstitial-free steel;
- warm rolling;
- texture;
- mechanical properties;
- microstructure

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