Paper Title:

Recrystallisation at Intercritical Annealing in Low Carbon Steels

Periodical Materials Science Forum (Volumes 558 - 559)
Main Theme Recrystallization and Grain Growth III
Edited by S.-J.L. Kang, M.Y. Huh, N.M. Hwang, H. Homma, K. Ushioda and Y. Ikuhara
Pages 247-252
DOI 10.4028/www.scientific.net/MSF.558-559.247
Citation Naoki Maruyama et al., 2007, Materials Science Forum, 558-559, 247
Online since October, 2007
Authors Naoki Maruyama, T. Ogawa, M. Takahashi
Keywords Dual-Phase Steel, Incomplete Recrystallisation, Intercritical Annealing, Low Carbon Steel, Recovery, Subgrain Growth
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Abstract

Subgrain growth in deformed ferrite and incomplete recrystallisation during intercritical annealing in low carbon (LC) steels was investigated by EBSD and FEGTEM/EDS. It was confirmed that fine dual phase (α+γ) microstructures could be obtained even without the addition of microalloying elements such as Nb and Ti, if the steels were heated above Ac1 temperature before the completion of primary recrystallisation and then intercritically annealed. The fine microstructure was found to be mainly due to the inhibition of primary recrystallisation, and also due to the inhibition of subgrain growth in deformed matrix by finely dispersed γ phase formed during heating. Mn segregation at α/γ interfaces seems to indicate that the kinetics of boundary migration in the existence of γ is controlled by the volume diffusion of substitutional alloying elements across the α/γ interfaces.