SciELO - Scientific Electronic Library Online

vol.115 número10Glow discharge optical emission spectroscopy: A general overview with regard to nuclear materialsThe influence of thermomechanical processing on the surface quality of an AISI 436 ferritic stainless steel índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados



Links relacionados

  • Em processo de indexaçãoCitado por Google
  • Em processo de indexaçãoSimilares em Google


Journal of the Southern African Institute of Mining and Metallurgy

versão On-line ISSN 2411-9717
versão impressa ISSN 0038-223X


ANNAN, K.A.; SIYASIYA, C.W.  e  STUMPF, W.E.. The influence of niobium content on austenite grain growth in microalloyed steels. J. S. Afr. Inst. Min. Metall. [online]. 2015, vol.115, n.10, pp.973-980. ISSN 2411-9717.

The relationship between niobium content and austenite grain growth has been investigated through hot rolling simulation on a Bähr dilatometer. The effect of delay time between passes during rough rolling in Nb-microalloyed steels with nitrogen contents typical for electric arc furnace (EAF) melting was studied. The results indicate that the grain growth constants n, Q, and A increase with an increase in Nb content. The activation energy for austenite grain growth Q was found to be in the range of 239 to 572 kJ/mol, the exponential constant n ranged from 2.8 to 6.2, and the material and processing condition constant A from 4.24 χ 1012 to 4.96 χ 1028, for steels with niobium contents ranging from 0.002% Nb to 0.1% Nb. A general constitutive equation for the prediction of austenite grain growth in these Nb-microalloyed steels under rough rolling conditions has been developed. Good agreement between the experimental and the predicted values was achieved with this constitutive equation.

Palavras-chave : constitutive equation; austenite grain growth; microalloying; deformation.

        · texto em Inglês     · Inglês ( pdf )