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Ferrite formation from deformed austenite in a Ti modified HSLA steel

Journal Article


Abstract


  • The effect of austenite deformation in the recrystallization, partial recrystallization and nonrecrystallization temperature range on the subsequent ferrite transformation was investigated in a commercial HSLA steel with 0.076 % Ti and a reference C-Mn steel of same base chemistry. The steel samples were given reductions in the range 20-60 % at 850, 950 and 1050°C by single pass rolling followed by isothermal transformation to ferrite at 690°C for up to 1800 s. It was found that the austenite to ferrite transformation rate was increased both with increase in the amount of austenite deformation and lowering the finish rolling temperature. The addition of titanium resulted in decrease in the rate of ferrite formation as well as led to the formation of polygonal ferrite grains. Non-recrystallized elongated austenite grains appear to give fine ferrite structure whilst mixed ferrite grains resulted from partially recrystallized austenite. It was observed that not only the austenite grain boundaries, but also the twin boundaries and/or the deformation bands within elongated austenite grains were found to act as potent nucleation sites for ferrite. © 1987 Canadian Institute of Mining and Metallurgy Pergamon Journals Ltd.

Publication Date


  • 1987

Citation


  • Misra, S., Dunne, D. P., & Chandra, T. (1987). Ferrite formation from deformed austenite in a Ti modified HSLA steel. Canadian Metallurgical Quarterly, 26(2), 155-160. doi:10.1179/cmq.1987.26.2.155

Scopus Eid


  • 2-s2.0-0023325290

Web Of Science Accession Number


Start Page


  • 155

End Page


  • 160

Volume


  • 26

Issue


  • 2

Abstract


  • The effect of austenite deformation in the recrystallization, partial recrystallization and nonrecrystallization temperature range on the subsequent ferrite transformation was investigated in a commercial HSLA steel with 0.076 % Ti and a reference C-Mn steel of same base chemistry. The steel samples were given reductions in the range 20-60 % at 850, 950 and 1050°C by single pass rolling followed by isothermal transformation to ferrite at 690°C for up to 1800 s. It was found that the austenite to ferrite transformation rate was increased both with increase in the amount of austenite deformation and lowering the finish rolling temperature. The addition of titanium resulted in decrease in the rate of ferrite formation as well as led to the formation of polygonal ferrite grains. Non-recrystallized elongated austenite grains appear to give fine ferrite structure whilst mixed ferrite grains resulted from partially recrystallized austenite. It was observed that not only the austenite grain boundaries, but also the twin boundaries and/or the deformation bands within elongated austenite grains were found to act as potent nucleation sites for ferrite. © 1987 Canadian Institute of Mining and Metallurgy Pergamon Journals Ltd.

Publication Date


  • 1987

Citation


  • Misra, S., Dunne, D. P., & Chandra, T. (1987). Ferrite formation from deformed austenite in a Ti modified HSLA steel. Canadian Metallurgical Quarterly, 26(2), 155-160. doi:10.1179/cmq.1987.26.2.155

Scopus Eid


  • 2-s2.0-0023325290

Web Of Science Accession Number


Start Page


  • 155

End Page


  • 160

Volume


  • 26

Issue


  • 2