Microstructure evolution during batch annealing |
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Authors: | Satyam S Sahay B V Harish Kumar Sangeetha J Krishnan |
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Affiliation: | (1) Tata Research Development & Design Centre 54B, 411 013 Hadapsar Industrial Estate Pune, India |
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Abstract: | Design of industrial annealing cycles requires recrystallization and grain growth studies, which are typically carried out
under isothermal laboratory condition. The kinetics coefficients of these phase transformations are obtained from such studies,
which are subsequently used in designing the industrial nonisothermal cycles using the additivity principles. However, the
strong heating rate effects on the grain growth kinetics necessitate such kinetics studies using industrial thermal profiles.
In the present work, the hot and cold spot cycles of an industrial batch annealing cycle for AIK grade steel have been simulated
in a programmable laboratory furnace. Subsequently, the effect of annealing temperature, soaking time, and heating rate on
the microstructural features, such as grain size distribution, grain shape anisotropy, and grain orientation, have been investigated
through extensive quantitative microscopy. The implications of these results on the design of industrial batch annealing cycles
have been discussed. |
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Keywords: | AIK steel annealing grain growth kinetics theory and modeling |
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