Analysis of the Static Recrystallization Behavior of Nb-Ti Microalloyed Steels Including Low Strain Levels

L. Sanz; Beatriz Pereda; B. López

doi:10.4028/www.scientific.net/MSF.879.1170

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HomeMaterials Science ForumMaterials Science Forum Vol. 879Analysis of the Static Recrystallization Behavior...

Analysis of the Static Recrystallization Behavior of Nb-Ti Microalloyed Steels Including Low Strain Levels

Abstract:

Semi-empirical models for predicting the austenite static recrystallization behavior are widely used in designing thermomechanical treatments to improve final mechanical properties. However, a problem with these models is that their utility can be limited to the range of deformation conditions and chemical compositions they were developed for. This work focuses on the study of the applicability of current recrystallization models to the range of low strain conditions and/or high Nb microalloying additions (≈0.1%). To do so, the recrystallization behavior of two low carbon Nb-Ti microalloyed steels (0.04 and 0.11% Nb and ≈0.01% Ti) has been investigated by torsion tests. Experimental results for recrystallization time and recrystallized grain size have been compared to previously developed equations. It has been observed that at low strains (ε = 0.1) the predictions fail. A dependence of the n Avrami exponent both on temperature and applied strain was also found.

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Periodical:

Materials Science Forum (Volume 879)

Pages:

1170-1175

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.879.1170

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Online since:

November 2016

Authors:

L. Sanz, Beatriz Pereda, B. López*

Keywords:

Hot Working, Low Strain, Microalloyed Steel, Niobium, Static Recrystallization

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References

[10] for the low Nb steel at these strain conditions are relatively good. To study the effect of strain on the recrystallized microstructure, in Fig. 7(b) logDSRX vs loge has been plotted. The slope of the linear regression of the data provides the strain exponent for recrystallized grain size calculation (DSRX∝ε-m). The experimental value determined from the data, m = 0. 47, is lower than those reported in the equations considered in Fig. 7(a). However, m values in the range of those obtained in the present work have also been reported for C-Mn and microalloyed steels [7, 8]. Difficulties in the measurement of austenite grain size due to martensitic transformation may in part explain the spread in the literature data.

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