About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
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Advances in Ferrous Metallurgy
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Presentation Title |
Effect of Alloying Content on Fractional Softening Behavior and Microstructural Evolution During Double-twist Torsion Testing of Microalloyed Steels |
Author(s) |
Trevor J. Ballard, Emmanuel De Moor |
On-Site Speaker (Planned) |
Trevor J. Ballard |
Abstract Scope |
The non-recrystallization temperature (T<sub>nr</sub>) represents an important parameter in the development of controlled rolling schedules. T<sub>nr</sub> is commonly defined as the temperature below which complete static recrystallization ceases to occur. While T<sub>nr</sub> is defined as a single temperature, partial recrystallization occurs over a wide temperature range. The current study applies a double-twist torsion test to a set of microalloyed steels with varying titanium, niobium, and vanadium contents. The partial recrystallization temperature regime was predicted for each alloy using fractional softening calculations. Increasing niobium reduced the fractional softening, while varying titanium and vanadium had minimal effect. Interrupted double-twist torsion tests were conducted to study the microstructural evolution at temperatures above, within, and below the partial recrystallization regime. The prior austenite microstructure was evaluated to assess the correspondence between the recrystallized fraction and fractional softening. The precipitation state was evaluated to show the effect of microalloying content on recrystallization and softening behavior. |