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Effect of niobium clustering and precipitation on strength of an NbTi-microalloyed ferritic steel

Journal Article


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Abstract


  • The microstructure-property relationship for a NbTi-microalloyed ferritic steel was studied as a function of thermo-mechanical schedule using a Gleeble 3500 simulator, optical and scanning electron microscopy, and atom probe tomography. Contributions to the yield stress from grain size, solid solution, work hardening, particle and cluster strengthening were calculated using the established equations and the measured microstructural parameters. With a decrease in the austenite deformation temperature the yield stress decreased, following a decrease in the number density of > 20 nm Nb-rich particles and 5 nm Nb-C clusters, although the grain refinement contribution increased. To achieve the maximum cluster/precipitation strengthening in ferrite, the austenite deformation should be carried out in the recrystallisation temperature region where there is a limited tendency for strain-induced precipitation. Based on the analysis of cluster strengthening increment, it could be suggested that the mechanism of dislocation-cluster interaction is closer to shearing than looping.

Authors


  •   Kostryzhev, Andrew (external author)
  •   Al shahrani, Abdullah (external author)
  •   Zhu, Chen (external author)
  •   Cairney, Julie M. (external author)
  •   Ringer, Simon Peter. (external author)
  •   Killmore, Chris R. (external author)
  •   Pereloma, Elena V.

Publication Date


  • 2014

Citation


  • Kostryzhev, A., Al-Shahrani, A., Zhu, C., Cairney, J., Ringer, S. P., Killmore, C. & Pereloma, E. V. (2014). Effect of niobium clustering and precipitation on strength of an NbTi-microalloyed ferritic steel. Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing, 607 226-235.

Scopus Eid


  • 2-s2.0-84898780943

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3256&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2247

Number Of Pages


  • 9

Start Page


  • 226

End Page


  • 235

Volume


  • 607

Abstract


  • The microstructure-property relationship for a NbTi-microalloyed ferritic steel was studied as a function of thermo-mechanical schedule using a Gleeble 3500 simulator, optical and scanning electron microscopy, and atom probe tomography. Contributions to the yield stress from grain size, solid solution, work hardening, particle and cluster strengthening were calculated using the established equations and the measured microstructural parameters. With a decrease in the austenite deformation temperature the yield stress decreased, following a decrease in the number density of > 20 nm Nb-rich particles and 5 nm Nb-C clusters, although the grain refinement contribution increased. To achieve the maximum cluster/precipitation strengthening in ferrite, the austenite deformation should be carried out in the recrystallisation temperature region where there is a limited tendency for strain-induced precipitation. Based on the analysis of cluster strengthening increment, it could be suggested that the mechanism of dislocation-cluster interaction is closer to shearing than looping.

Authors


  •   Kostryzhev, Andrew (external author)
  •   Al shahrani, Abdullah (external author)
  •   Zhu, Chen (external author)
  •   Cairney, Julie M. (external author)
  •   Ringer, Simon Peter. (external author)
  •   Killmore, Chris R. (external author)
  •   Pereloma, Elena V.

Publication Date


  • 2014

Citation


  • Kostryzhev, A., Al-Shahrani, A., Zhu, C., Cairney, J., Ringer, S. P., Killmore, C. & Pereloma, E. V. (2014). Effect of niobium clustering and precipitation on strength of an NbTi-microalloyed ferritic steel. Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing, 607 226-235.

Scopus Eid


  • 2-s2.0-84898780943

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3256&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2247

Number Of Pages


  • 9

Start Page


  • 226

End Page


  • 235

Volume


  • 607