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Effect of mo, nb and v on hot deformation behaviour, microstructure and hardness of microalloyed steels

Journal Article


Abstract


  • Three novel low carbon microalloyed steels with various additions of Mo, Nb and V were investigated after thermomechanical processing simulations designed to obtain ferrite-bainite microstructure. With the increase in microalloying element additions from the High V-to NbV-to MoNbV-microalloyed steel, the high temperature flow stresses increased. The MoNbV and NbV steels have shown a slightly higher non-recrystallization temperature (1000°C) than the High V steel (975°C) due to the solute drag from Nb and Mo atoms and austenite precipitation of Nb-rich particles. The ambient temperature microstructures of all steels consisted predominantly of polygonal ferrite with a small amount of granular bainite. Precipitation of Nb-and Mo-containing carbonitrides (>20 nm size) was observed in the MoNbV and NbV steels, whereas only coarser (~40 nm) iron carbides were present in the High V steel. Finer grain size and larger granular bainite fraction resulted in a higher hardness of MoNbV steel (293 HV) compared to the NbV (265 HV) and High V (285 HV) steels.

Authors


  •   Singh, Navjeet (external author)
  •   Kostryzhev, Andrew (external author)
  •   Killmore, Chris R. (external author)
  •   Pereloma, Elena V.

Publication Date


  • 2018

Citation


  • Singh, N., Kostryzhev, A. G., Killmore, C. R. & Pereloma, E. V. (2018). Effect of mo, nb and v on hot deformation behaviour, microstructure and hardness of microalloyed steels. Materials Science Forum, 941 3-8.

Scopus Eid


  • 2-s2.0-85064077292

Number Of Pages


  • 5

Start Page


  • 3

End Page


  • 8

Volume


  • 941

Place Of Publication


  • Switzerland

Abstract


  • Three novel low carbon microalloyed steels with various additions of Mo, Nb and V were investigated after thermomechanical processing simulations designed to obtain ferrite-bainite microstructure. With the increase in microalloying element additions from the High V-to NbV-to MoNbV-microalloyed steel, the high temperature flow stresses increased. The MoNbV and NbV steels have shown a slightly higher non-recrystallization temperature (1000°C) than the High V steel (975°C) due to the solute drag from Nb and Mo atoms and austenite precipitation of Nb-rich particles. The ambient temperature microstructures of all steels consisted predominantly of polygonal ferrite with a small amount of granular bainite. Precipitation of Nb-and Mo-containing carbonitrides (>20 nm size) was observed in the MoNbV and NbV steels, whereas only coarser (~40 nm) iron carbides were present in the High V steel. Finer grain size and larger granular bainite fraction resulted in a higher hardness of MoNbV steel (293 HV) compared to the NbV (265 HV) and High V (285 HV) steels.

Authors


  •   Singh, Navjeet (external author)
  •   Kostryzhev, Andrew (external author)
  •   Killmore, Chris R. (external author)
  •   Pereloma, Elena V.

Publication Date


  • 2018

Citation


  • Singh, N., Kostryzhev, A. G., Killmore, C. R. & Pereloma, E. V. (2018). Effect of mo, nb and v on hot deformation behaviour, microstructure and hardness of microalloyed steels. Materials Science Forum, 941 3-8.

Scopus Eid


  • 2-s2.0-85064077292

Number Of Pages


  • 5

Start Page


  • 3

End Page


  • 8

Volume


  • 941

Place Of Publication


  • Switzerland