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Research Article

Effect of chromium on microstructure and the hot ductility of Nb microalloyed steel

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  • Received: 16 February 2020Revised: 9 May 2020Accepted: 11 May 2020Available online: 13 May 2020
  • The effects of chromium on γ-austenite to α-ferrite phase transformation in Nb Microalloyed steel was observed using ultra high-temperature confocal laser scanning microscopy. It is indicated that the starting temperature of the γ→α phase transformation decreases with increasing the Cr content. The hot ductility of Nb microalloyed steel is improved by adding 0.12wt% Cr. Chromium atoms inhibit the diffusion of carbon atoms, which leads to the reduction of grain boundary ferrite thickness. The proportion of high angle grain boundaries is increased by adding chromium. In particular, the proportion is up to 48.7% when the Cr content is 0.12wt%.The high angle grain boundaries hinder the crack propagation and improve the ductility of Nb microalloyed steel.
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Effect of chromium on microstructure and the hot ductility of Nb microalloyed steel

  • Corresponding author:

    Yan-hui Sun    E-mail: ustb420@126.com

  • Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China

Abstract: The effects of chromium on γ-austenite to α-ferrite phase transformation in Nb Microalloyed steel was observed using ultra high-temperature confocal laser scanning microscopy. It is indicated that the starting temperature of the γ→α phase transformation decreases with increasing the Cr content. The hot ductility of Nb microalloyed steel is improved by adding 0.12wt% Cr. Chromium atoms inhibit the diffusion of carbon atoms, which leads to the reduction of grain boundary ferrite thickness. The proportion of high angle grain boundaries is increased by adding chromium. In particular, the proportion is up to 48.7% when the Cr content is 0.12wt%.The high angle grain boundaries hinder the crack propagation and improve the ductility of Nb microalloyed steel.

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