Cold Forming Properties After Cold Rolling and Recrystallization Annealing of Commercially Pure Titanium Sheet

Abstract

Cold rolling and recrystallization annealing processing of commercially pure titanium (CP-Ti) sheet was conducted. Cold forming properties using a microstructural analysis, Vickers microhardness and erichsen value measurements were investigated. The results have shown that alpha grain sizes of processing 1 and 2 are 20.58μm and 30.90μm, respectively. Erichsen test results of the specimens of processing 1 have the lowest values. This is because deformation of a reduction of 75% increases crystal defects and leads to the high dislocation density. Cold forming properties of the specimens of processing 2 also became poor due to 50% cold reduction. The effect of the first recrystallization annealing was remained. Equiaxed alpha grains are formed from the elongated grains and cold forming properties of CP-Ti were improved.