Abstract
The analyses of texture evolution of cold rolled interstitial free (IF) steel sheets during annealing and recrystallization are presented, in which the dispersion curves of surface acoustic waves (SAW) excited by laser-induced transient thermal grating method are measured. The results show that the angular anisotropy of the SAW velocity changes due to the texture changes at different stages of recrystallization. The theoretically simulated angular dispersion of SAW velocity within individual crystal revealed that the change of SAW velocity is closely related to recrystallization texture evolution. A model for the angular dependence of the SAW velocity in textured polycrystalline IF steel with different oriented crystals is presented and the simulations are yielded, which show that the results agree with those of experiments.
Highlights
The annealing and recrystallization of materials produce new microstructures under heating conditions, and have important influences on the properties of materials [1,2,3,4], such as deformation behavior [1,2] and magnetic susceptibility [5]
6, 2978 which was in them/s nucleation stage, the was velocity varies between m/s and, the highest velocity in the between 2978 m/s and 3031 m/s, the highest surface acoustic waves (SAW) velocity was in the rolling varies between m/s and m/s, the highest velocity was in the rolling direction the lowest
The maximum, minimum and average velocities of SAW showed a downward trend, which was the same as the volume fraction change trend of {100} texture and opposite to that of {111} texture. This may indicate that the decrease of the SAW velocity in interstitial free (IF) steel during recrystallization was due to the increasing volume fraction of {111} texture and the decreasing fraction of {100} texture
Summary
The annealing and recrystallization of materials produce new microstructures under heating conditions, and have important influences on the properties of materials [1,2,3,4], such as deformation behavior [1,2] and magnetic susceptibility [5]. Few researchers have analyzed the influence of each texture component on the SAW dispersion during recrystallization; in addition, there is a lack of online texture detection theoretical model based on laser ultrasound. One of the pulsed laser ultrasonic techniques, i.e., the transient thermal grating technique [17,18,19], has been known as Impulsive Stimulated Scattering (ISS), which is used to study texture evolution during recrystallization processing of cold rolled interstitial free (IF) steel sheets. Based on the numerical simulation of angular dispersion of SAW velocity in different orientated single crystals, the angular dispersions of SAW velocity in textured polycrystalline metals and the influence of different texture components on the angular dependence of the SAW velocity were analyzed. The results show that both the experiments and simulations are in agreement
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