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Nitriding of a Nb-microalloyed thin strip cast steel at 525��C

Journal Article


Abstract


  • This study investigates the effect of N diffusion on a Nb-microalloyed steel made by twin roll casting at 525�� C in a KNO3 salt bath. Nitriding up to 4 h increases the yield strength of the steel by ���50% with only a small drop in ductility, while 6 hours of nitriding causes brittle fracture. The improved mechanical performance after 4 hours of nitriding is thought to be a combined effect of solid solution strengthening of N diffusion and dispersion strengthening from extremely fine Nb-rich precipitates. Coarse features along grain boundaries consistently observed in steel nitrided for 6 hours are considered to be responsible for brittle fracture in samples nitrided for longer. �� (2010) Trans Tech Publications.

UOW Authors


  •   Barbaro, Frank (external author)

Publication Date


  • 2010

Citation


  • Xie, K. Y., Zhu, C., Cairney, J. M., Ringer, S. P., Killmore, C. R., Barbaro, F. J., & Williams, J. G. (2010). Nitriding of a Nb-microalloyed thin strip cast steel at 525��C. Materials Science Forum, 654-656, 106-109. doi:10.4028/www.scientific.net/MSF.654-656.106

Scopus Eid


  • 2-s2.0-77955495818

Web Of Science Accession Number


Start Page


  • 106

End Page


  • 109

Volume


  • 654-656

Issue


Place Of Publication


Abstract


  • This study investigates the effect of N diffusion on a Nb-microalloyed steel made by twin roll casting at 525�� C in a KNO3 salt bath. Nitriding up to 4 h increases the yield strength of the steel by ���50% with only a small drop in ductility, while 6 hours of nitriding causes brittle fracture. The improved mechanical performance after 4 hours of nitriding is thought to be a combined effect of solid solution strengthening of N diffusion and dispersion strengthening from extremely fine Nb-rich precipitates. Coarse features along grain boundaries consistently observed in steel nitrided for 6 hours are considered to be responsible for brittle fracture in samples nitrided for longer. �� (2010) Trans Tech Publications.

UOW Authors


  •   Barbaro, Frank (external author)

Publication Date


  • 2010

Citation


  • Xie, K. Y., Zhu, C., Cairney, J. M., Ringer, S. P., Killmore, C. R., Barbaro, F. J., & Williams, J. G. (2010). Nitriding of a Nb-microalloyed thin strip cast steel at 525��C. Materials Science Forum, 654-656, 106-109. doi:10.4028/www.scientific.net/MSF.654-656.106

Scopus Eid


  • 2-s2.0-77955495818

Web Of Science Accession Number


Start Page


  • 106

End Page


  • 109

Volume


  • 654-656

Issue


Place Of Publication