Effect of Annealing Conditions on the Dissolution Process of Complex Carbonitrides in a V-Nb-Ti Microalloyed Steel


Article Preview

The present work has been undertaken to assess the evolution of dissolution process of large dendritic precipitates in a V-Nb-Ti microalloyed steel. The study was performed by reheating the samples at 1250°C, simulating the industrial reheating practices at laboratory scale and in situ, following industrial profile; afterwards the samples were quenched in 10%NaCl aqueous solution. The characterization of the material was carried out by scanning electron microscopy accompanied with dispersive energy spectrometry, and chemical analysis by inductively coupled plasma optical emission spectrometry. The results showed a partial dissolution of dendritic precipitates. This process ocurred by a progressive dissolving the Nb-rich shells formed over cuboidal particles and primary arm of well-faceted dendritic precipitates, and by fragmentation and spheroidization of secondary branches. These processes gave rise to spherical Nb rich precipitates and cuboidal particles at the reheating conditions used in this study. Both type of particles contain vanadium.



Main Theme:

Edited by:

R. Shabadi, Mihail Ionescu, M. Jeandin, C. Richard and Tara Chandra




G. Basanta et al., "Effect of Annealing Conditions on the Dissolution Process of Complex Carbonitrides in a V-Nb-Ti Microalloyed Steel", Materials Science Forum, Vol. 941, pp. 21-26, 2018

Online since:

December 2018




* - Corresponding Author

[1] H. R. Wang, W. Wang, Precipitation of complex carbonitrides in a Nb–Ti microalloyed plate steel, J Mater Sci. 44 (2009) 591–600.

DOI: https://doi.org/10.1007/s10853-008-3069-0

[2] P. Gong, E.J. Palmiere , W.M. Rainforth, Dissolution and precipitation behaviour in steels microalloyed with niobium during thermomechanical processing, Acta Materialia. 97 (2015) 392–403.

DOI: https://doi.org/10.1016/j.actamat.2015.06.057

[3] J.G. Jung, J.-S. Park, Y.-S. Ha, Y.-K. Lee, J.-H. Bae, K. Kim, Dissolution Behavior of Complex Carbonitrides in a Microalloyed Steel, J. of the Korean Society for Heat Treatment. 21 No 6 (2008) 287-292.

[4] S.G. Hong H.J. Jun, K.B. Kang B. C. G. Park , Evolution of precipitates in the Nb–Ti–V microalloyed HSLA steels during reheating, Scripta Materialia . 48 (2003) 1201–1206.

DOI: https://doi.org/10.1016/s1359-6462(02)00567-5

[5] M. Nöhrer, S. Zamberger, H. Leitner, Strain-Induced Precipitation Behavior of a Nb–Ti–V Steel in the Austenite Phase Field, Steel Research Int. 84 (2013) 827-836.

DOI: https://doi.org/10.1002/srin.201200257

[6] H. LEE, K.-S. PARK, J. H. LEE, Y.-U. Heo, D.-W. Suh and H. K. D. H. Bhadeshia, Dissolution Behaviour of NbC during Slab Reheating. ISIJ International, 54 No. 7 (2014) 1677–1681.

DOI: https://doi.org/10.2355/isijinternational.54.1677

[7] S.Q. Yuan, G.I. Liang, Dissolving behavior of second phase particles in Nb-Ti microalloyed steels, Materials Letter. 63, (2009) 2324-2326.

DOI: https://doi.org/10.1016/j.matlet.2009.07.064

[8] C. P. Schiavo, B. M. Gonzalez, A. A. dos Santos, K.M. Marra, Pesantes. Influencia dos parametros de solubilizacao temperature e tempo de encharque na TNR de um aco microligado AO Nb, V e Ti, Tecnol.Metal.Mater.Miner., Sao Paulo, V8, n.1, (2011) 14-18.

DOI: https://doi.org/10.4322/tmm.2011.003

[9] I. I. Gorbachev, V. V. Popov, and A. Yu. Pasynkov, Thermodynamic Calculations of Carbonitride Formation in Low -Alloy Low-Carbon Steels Containing V, Nb, and Ti, The Physics of Metals and Metallography. 115 No. 1 (2014) 69-76.

DOI: https://doi.org/10.1134/s0031918x14010074

[10] G. Basanta, A. L. Riva, Diaz E., Carlos Parra, Costa e Silva: Submitted to Indian Journal of Engineering and Materials Science.

[11] G. Basanta, A. L. Rivas, A. Costa S. and E. Díaz, Dendritic precipitates in as-cast Nb-Ti-V microalloyed steel. Acta Microacopica. (2017) 46-47.

[12] T. N. Baker, Microalloyed steels, Ironmaking & Steelmaking. 43 (2016) 264-307.

[13] C.L Davis and M. Strangwood, Preliminary study of the inhomogeneous precipitate distributions in Nb-microalloyed plate steels. Journal of Materials Science. 37 (2002) 1083-1090.

[14] A. Ruiz-Aparicio, Evolution of Microstructure in Nb-Bearing Microalloyed Steels Produced by the Compact Strip Production Process. M. S. University of Pittsburgh. (2004). Thesis.

[15] Craven, K., He, L. A., Garvie§, J & T. N., Baker, Complex Heterogeneous Precipitation In Titanium–Niobium Microalloyed Al-Killed Hsla Steels-I. (Ti,Nb)(C,N) Particles, Acta Mater. 48, (2000), 3857–3868.

DOI: https://doi.org/10.1016/s1359-6454(00)00194-4