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Volume 25 Issue 5
May  2018
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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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研究论文

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

  • 通讯作者:

    Yong-lin Kang    E-mail: kangylin@ustb.edu.cn

  • 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.
  • Research Article

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

    + Author Affiliations
    • 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.
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