Effect of Heating Rate on Recrystallization of Twin Roll Cast Aluminum

• Published in: Metallurgical and materials transactions. A, Physical metallurgy and materials science Vol. 39; no. 1; pp. 165 - 170
• Main Authors: Sun, Naiyu, Patterson, Burton R., Suni, Jaakko P., Doherty, Roger D., Weiland, Hasso, Kadolkar, Puja, Blue, Craig A., Thompson, Gregory B.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.01.2008; Springer; Springer Nature B.V
• Subjects: Aluminum; Applied sciences; Characterization and Evaluation of Materials; Chemistry and Materials Science; Cold rolling; Energy efficiency; Exact sciences and technology; Grain growth; Heating; Homogenization; Hot rolling; Materials Science; Metallic Materials; Metallurgy; Metals. Metallurgy; Nanotechnology; Solid solutions; Structural Materials; Surfaces and Interfaces; Thin Films; Transmission electron microscopy; Subgrain Boundary; Direct Chill; Lower Heating Rate; Recrystallization; Hold Temperature; Continuous casting; Foundry; Microstructure; Heating rate
• ISSN: 1073-5623; 1543-1940
• DOI: 10.1007/s11661-007-9367-3

The effect of heating rate on precipitation and recrystallization behavior in twin roll cast (TRC) AA3105 has been investigated by three different means: conventional air furnace, controlled infrared, and lead bath heating. Experimental results showed that as-recrystallized grain size decreased and became more equiaxed as the annealing heating rate increased. These results were explained via time-temperature-transformation (TTT) curves for both dispersoid precipitation and recrystallization. With the faster heating rate, recrystallization could occur before precipitation of Mn present in the unhomogenized TRC samples. At a heating rate of 50 °C/s, the material underwent grain growth after recrystallization at 500 °C. No sign of grain growth was observed in materials annealed with lower heating rates, 3 °C/s, 0.5 °C/s, and 0.01 °C/s, due to greater dispersoid precipitation.