Accelerated recrystallization behavior of commercially pure titanium subjected to an alternating-current electropulse

Abstract

Electropulsing has various engineering benefits compared with the traditional heating method. This study investigated the effect of electropulsing treatment on the recrystallization behavior of commercially pure titanium (CP–Ti) according to the electropulsing duration and direction. The application of a 2-s electropulse barely caused recrystallization, whereas a 4-s electropulse caused microstructural evolutions that significantly varied with the electropulsing direction and the observed sections (i.e., center, quarter, and edge). Static recrystallization was completed in the center section through the application of a 4-s electropulse at a current density of 29 A·mm−2, which suggests the accelerated recrystallization capability of electropulsing. Under the same conditions, electropulsing along the rolling direction of the CP-Ti sheet exhibited a higher recrystallization rate than that along the transverse direction. This is attributed to the different arrangement of the grain boundaries between the two samples.

Keywords

• Titanium
• Anisotropy
• Recrystallization
• Electropulsing