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Effect of austenitising temperature on mechanical properties of nanostructured bainitic steel

Materials (2017) 10(8)
DOI: 10.3390/ma10080874
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Abstract

Nanostructured bainite was obtained in high-carbon Si-Al-rich steel by low-temperature (220-260 °C) isothermal transformation after austenitisation at different temperatures (900 °C, 1000 °C, and 1150 °C). Improved strength-ductility-toughness balance was achieved in the nanostructured bainitic steel austenitised at low temperatures (900 °C and 1000 °C). Increasing the austenitising temperature not only coarsened prior austenite grains and bainite packets, but also increased the size and fraction of blocky retained austenite. High austenitising temperature (1150 °C) remarkably decreased ductility and impact toughness, but had a small effect on strength and hardness.

Figures

  • Figure 1. Optical microscopy (OM) images of prior austenite grains in samples austenitised at (a) 900 °C; (b) 1000 °C; (c) 1150 °C; and (d) dependence of prior austenite grain size on austenitising temperature.
  • Figure 2. OM images of microstructures in samples isothermally transformed at (a,c,e) 220 °C and (b,d,f) 260 °C after austenitised at (a,b) 900 °C; (c,d) 1000 °C; and (e,f) 1150 °C.
  • Figure 4. XRD patterns of samples isothermally transformed at 220 °C, 240 °C, and 260 °C after austenitised at (a–c) 900 °C; and (d–f) 1150 °C.
  • Figure 4. XRD patterns of samples isothermally transformed at 220 °C, 240 °C, and 260 °C after austenitised at (a–c) 900 °C; and (d–f) 1150 °C.
  • Figure 5. Engineering stress-strain curves of samples isothermally transformed at (a) 220 °C; (b) 240 °C; and (c) 260 °C after austenitisation at different temperatures.
  • Table 1. Results of mechanical properties of samples isothermally transformed. TEL: total elongation; UTS: ultimate tensile strength; YS: yield strength.
  • Table 1. Results of mechanical properties of samples isothermally transformed. TEL: total elongation; UTS: ultimate tensile strength; YS: yield strength.
  • Figure 7. SEM fractographs of impact samples isothermally transformed at 260 °C after austenitised at (a,c) 900 °C and (b,d) 1150 °C. (a,b) are low magnification images; (c,d) are high magnification images.

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CITATION STYLE

APA

Zhao, J., Li, J., Ji, H., & Wang, T. (2017). Effect of austenitising temperature on mechanical properties of nanostructured bainitic steel. Materials, 10(8). https://doi.org/10.3390/ma10080874

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