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Influence of austenite grain size on martensite start temperature of Nb-V-Ti microalloyed ultra-high strength steel

Journal Article


Abstract


  • In order to investigate the effect of austenite grain size on martensite start temperature of Nb-V-Ti micro-alloyed ultra-high strength steel, the phase transformation features of Nb-V-Ti micro-alloyed steel was investigated. It has been found that martensite start temperature increased with the increase of austenite grain size as a consequence of the increase of austenitizing temperature. Based on microstructure observation, two types of MX carbonitrides with different compositions and morphologies have been identified. With the increase of the austenite grain size, both the volume fraction of precipitates and the dislocation density decreased, which may be induced by the strengthening of the austenite matrix directly and increasing the resistance of austenite to plastic deformation. Hence, the increase of martensite start temperature could be attributed to a decrease in volume fraction of precipitates and dislocation density.

Publication Date


  • 2016

Citation


  • Dong, J., Liu, C. X., Liu, Y. C., Li, C., Guo, Q. Y., & Li, H. J. (2016). Influence of austenite grain size on martensite start temperature of Nb-V-Ti microalloyed ultra-high strength steel. Materials Science Forum, 848, 624-632. doi:10.4028/www.scientific.net/MSF.848.624

Scopus Eid


  • 2-s2.0-84962119017

Web Of Science Accession Number


Start Page


  • 624

End Page


  • 632

Volume


  • 848

Abstract


  • In order to investigate the effect of austenite grain size on martensite start temperature of Nb-V-Ti micro-alloyed ultra-high strength steel, the phase transformation features of Nb-V-Ti micro-alloyed steel was investigated. It has been found that martensite start temperature increased with the increase of austenite grain size as a consequence of the increase of austenitizing temperature. Based on microstructure observation, two types of MX carbonitrides with different compositions and morphologies have been identified. With the increase of the austenite grain size, both the volume fraction of precipitates and the dislocation density decreased, which may be induced by the strengthening of the austenite matrix directly and increasing the resistance of austenite to plastic deformation. Hence, the increase of martensite start temperature could be attributed to a decrease in volume fraction of precipitates and dislocation density.

Publication Date


  • 2016

Citation


  • Dong, J., Liu, C. X., Liu, Y. C., Li, C., Guo, Q. Y., & Li, H. J. (2016). Influence of austenite grain size on martensite start temperature of Nb-V-Ti microalloyed ultra-high strength steel. Materials Science Forum, 848, 624-632. doi:10.4028/www.scientific.net/MSF.848.624

Scopus Eid


  • 2-s2.0-84962119017

Web Of Science Accession Number


Start Page


  • 624

End Page


  • 632

Volume


  • 848