Abstract
Stress relaxation method was carried out on a Ti micro-alloyed interstitial-free (IF) steel at the temperature ranging from 800 to 1000 °C. The results show that the softening kinetics curves of deformed austenite can be divided into three stages. At the first stage, the stress has a sharp drop due to the onset of recrystallization. At the second stage, a plateau appears on the relaxation curves indicating the start and finish of strain-induced precipitation. At the third stage, the stress curves begin to descend again because of coarsening of precipitates. Precipitation-time-temperature (PTT) diagram exhibited a “C” shape, and the nose point of the PTT diagram is located at 900 °C and the start precipitation time of 10 s. The theoretical calculation shows that the strain-induced precipitates were confirmed as almost pure TiC particles. The TiC precipitates were heterogeneously distributed in either a chain-like or cell-like manner observed by transmission electron microscopy (TEM), which indicates the precipitates nucleated on dislocations or dislocation substructures. In addition, a thermodynamic analytical model was presented to describe the precipitation in Ti micro-alloyed IF steel, which shows a good agreement between the experimental observation and the predictions of the model.
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Hui, Yj., Yu, Y., Wang, L. et al. Strain-induced precipitation in Ti micro-alloyed interstitial-free steel. J. Iron Steel Res. Int. 23, 385–392 (2016). https://doi.org/10.1016/S1006-706X(16)30061-9
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DOI: https://doi.org/10.1016/S1006-706X(16)30061-9