Study on the microstructure and formability of commercially pure titanium in two-temperature deep drawing

From recent research, it has been found that deep drawing at two temperatur es can make SUS304 exhibit deep drawability, the present investigation test ing materials with other structures by the process. Commercially pure titan ium (CP Ti)(alpha-Ti) exhibits almost twice the deep drawability when the t emperature is increased from room temperature to 400 degrees C. The process can make the deep drawability of alpha-Ti much more effective. The breakin g point of titanium sheet is in the direction perpendicular to the rolling direction because of the effect from two different directions due to the an isotropy of the material. A suitable blank-holding force (BHF) can help to reach a limited drawing depth, the required force decreasing when the opera ting temperature increases. From X-ray and TEM identification the process c an drive more slip systems to relax strain energy to obtain good deep drawa bility by virtue of better ductility. (C) 1999 Elsevier Science S.A. All ri ghts reserved.