Influence of heating rate on anisothermal recrystallization in low and ultra-low carbon steels

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 303; no. 1; pp. 90 - 99
• Main Authors: Muljono, D, Ferry, M, Dunne, D.P
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.05.2001; Elsevier
• Subjects: Anisothermal recrystallization; Applied sciences; Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization; Cold working, work hardening; annealing, quenching, tempering, recovery, and recrystallization; textures; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Grain size; Heating rate; Materials science; Metals. Metallurgy; Physics; Texture; Treatment of materials and its effects on microstructure and properties; Grain size; Anisothermal recrystallization; Heating rate; Texture; Rapid thermal annealing; Annealing; Carbon content; Very low carbon steel; Holding time; Recrystallization; Carbon steels; Kinetics; Experimental study; Heat treatments
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/S0921-5093(00)01882-7

High-rate annealing experiments were carried out to study the effect of heating rate on the recrystallization kinetics, grain size and texture of steels with a range of carbon levels (0.003–0.05% C). The steels were cold-rolled to 70% reduction and subsequently annealed at heating rates from 50 to 1000°C s −1 to peak temperatures ( T p) in the range 600 to 900°C. To minimise masking effects associated with rapid isothermal recrystallization at high temperature, all samples were water-quenched within 0.05 s of reaching T p. For the steels investigated, the rate of anisothermal recrystallization and the final grain size decrease with increasing heating rate. These results do not support previous work in which it was concluded that ultra-rapid softening (which was associated with an observed decrease in recrystallization temperature at high heating rate and increase in grain size) occurs at heating rates in excess of 500°C s −1. The present results, together with simulation using an anisothermal annealing model, indicate that ‘ultra-rapid softening’ is likely to be an artefact of these earlier experiments.