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Precipitation and impact toughness of Nb-V stabilised 18Cr-2Mo ferritic stainless steel during isothermal aging

Journal Article


Abstract


  • The effect of isothermal aging on precipitation behaviour and Charpy impact toughness of Nb–V stabilised 18Cr–2Mo ferritic stainless steel was investigated by means of Thermo-Calc prediction, scanning electron microscopy, transmission electron microscopy, X-ray diffraction and Charpy impact toughness testing. The results show that, niobium, vanadium carbides and nitrides, Fe2Nb (Laves phase) and Cr23C6 formed after 2 h aging at 800 °C, and the equilibrium solvus temperature of Fe2Nb phase increases to above 750 °C, higher than the calculated temperature (730 °C) using Thermo-Calc. After isothermal aging at 750–950 °C, 2 h aging resulted in a decrease in toughness due to the formation of precipitation, especially (Nb,V)(C,N) and Fe2Nb. When isothermally aged at 800 °C for up to 24 h, the coarsening rate of Fe2Nb particle is much higher than that of (Nb,V)(C,N), and the impact toughness of the steel is dependent on quantity and sizes of (Nb,V)(C,N) and Fe2Nb particles.

UOW Authors


  •   Han, Jian (external author)
  •   Li, Hui Jun.
  •   Barbaro, Frank (external author)
  •   Jiang, Laizhu (external author)
  •   Zhu, Zhixiong (external author)
  •   Xu, Haigang (external author)
  •   Ma, Li (external author)

Publication Date


  • 2014

Citation


  • Han, J., Li, H., Barbaro, F., Jiang, L., Zhu, Z., Xu, H. & Ma, L. (2014). Precipitation and impact toughness of Nb-V stabilised 18Cr-2Mo ferritic stainless steel during isothermal aging. Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing, 612 63-70.

Scopus Eid


  • 2-s2.0-84903548193

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2908

Has Global Citation Frequency


Number Of Pages


  • 7

Start Page


  • 63

End Page


  • 70

Volume


  • 612

Place Of Publication


  • Netherlands

Abstract


  • The effect of isothermal aging on precipitation behaviour and Charpy impact toughness of Nb–V stabilised 18Cr–2Mo ferritic stainless steel was investigated by means of Thermo-Calc prediction, scanning electron microscopy, transmission electron microscopy, X-ray diffraction and Charpy impact toughness testing. The results show that, niobium, vanadium carbides and nitrides, Fe2Nb (Laves phase) and Cr23C6 formed after 2 h aging at 800 °C, and the equilibrium solvus temperature of Fe2Nb phase increases to above 750 °C, higher than the calculated temperature (730 °C) using Thermo-Calc. After isothermal aging at 750–950 °C, 2 h aging resulted in a decrease in toughness due to the formation of precipitation, especially (Nb,V)(C,N) and Fe2Nb. When isothermally aged at 800 °C for up to 24 h, the coarsening rate of Fe2Nb particle is much higher than that of (Nb,V)(C,N), and the impact toughness of the steel is dependent on quantity and sizes of (Nb,V)(C,N) and Fe2Nb particles.

UOW Authors


  •   Han, Jian (external author)
  •   Li, Hui Jun.
  •   Barbaro, Frank (external author)
  •   Jiang, Laizhu (external author)
  •   Zhu, Zhixiong (external author)
  •   Xu, Haigang (external author)
  •   Ma, Li (external author)

Publication Date


  • 2014

Citation


  • Han, J., Li, H., Barbaro, F., Jiang, L., Zhu, Z., Xu, H. & Ma, L. (2014). Precipitation and impact toughness of Nb-V stabilised 18Cr-2Mo ferritic stainless steel during isothermal aging. Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing, 612 63-70.

Scopus Eid


  • 2-s2.0-84903548193

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2908

Has Global Citation Frequency


Number Of Pages


  • 7

Start Page


  • 63

End Page


  • 70

Volume


  • 612

Place Of Publication


  • Netherlands