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Characteristic flow behaviour prediction and microstructure analysis of a commercial Si¿Cr micro-alloyed spring steel under isothermal compression

Journal Article


Abstract


  • This article explores the characteristic flow behaviour and microstructure analysis of Si–Cr spring steel under various compression conditions by a Gleeble 3500 facility. To better simulate the abrupt and complex compression during the hot forming process, three compression strain rates (0.01 s−1, 0.1 s−1, and 1 s−1) and four compressive temperatures (850, 900, 950 and 1000 °C) were selected. The outcomes exhibit the intragranular dislocation cells and pile-up along the subgrains were formed during the dynamic recovery (DRV) progress. The dynamic recrystallisation (DRX) of the experimental steel arose with a higher value of the compression temperature. On this basis, a strain-compensated constitutive model considering the compression activation energy and a linear correlation between the Z parameter and DRX grain size are both established according to the strain-stress curves. The constitutive model is further verified by the multiple sets of hot deformation data and exhibits a good agreement between experimental and predicted points with an excellent correlation coefficient of 0.986 and a low relative error of 5.41%, indicating the reliability of the constitutive model throughout the entirety of the hot deformation process.

UOW Authors


  •   Lu, Yao (external author)
  •   Lin, Fei (external author)
  •   Wang, Jun (external author)
  •   Han, Jian (external author)
  •   Jiang, Zhengyi
  •   Xie, Haibo

Publication Date


  • 2021

Published In


Citation


  • Lu, Y., Xie, H., Wang, J., Li, Z., Lin, F., Han, J., . . . Jiang, Z. (2021). Characteristic flow behaviour prediction and microstructure analysis of a commercial Si¿Cr micro-alloyed spring steel under isothermal compression. Vacuum, 186. doi:10.1016/j.vacuum.2021.110066

Scopus Eid


  • 2-s2.0-85099358822

Volume


  • 186

Abstract


  • This article explores the characteristic flow behaviour and microstructure analysis of Si–Cr spring steel under various compression conditions by a Gleeble 3500 facility. To better simulate the abrupt and complex compression during the hot forming process, three compression strain rates (0.01 s−1, 0.1 s−1, and 1 s−1) and four compressive temperatures (850, 900, 950 and 1000 °C) were selected. The outcomes exhibit the intragranular dislocation cells and pile-up along the subgrains were formed during the dynamic recovery (DRV) progress. The dynamic recrystallisation (DRX) of the experimental steel arose with a higher value of the compression temperature. On this basis, a strain-compensated constitutive model considering the compression activation energy and a linear correlation between the Z parameter and DRX grain size are both established according to the strain-stress curves. The constitutive model is further verified by the multiple sets of hot deformation data and exhibits a good agreement between experimental and predicted points with an excellent correlation coefficient of 0.986 and a low relative error of 5.41%, indicating the reliability of the constitutive model throughout the entirety of the hot deformation process.

UOW Authors


  •   Lu, Yao (external author)
  •   Lin, Fei (external author)
  •   Wang, Jun (external author)
  •   Han, Jian (external author)
  •   Jiang, Zhengyi
  •   Xie, Haibo

Publication Date


  • 2021

Published In


Citation


  • Lu, Y., Xie, H., Wang, J., Li, Z., Lin, F., Han, J., . . . Jiang, Z. (2021). Characteristic flow behaviour prediction and microstructure analysis of a commercial Si¿Cr micro-alloyed spring steel under isothermal compression. Vacuum, 186. doi:10.1016/j.vacuum.2021.110066

Scopus Eid


  • 2-s2.0-85099358822

Volume


  • 186