Abstract
Tensile strength, grain size and fiber texture of titanium wires which were annealed at 350°—800°for 0.5-1000 min, were examined by means of tensile test, micro-scopy and X-ray diffraction. The titanium wires examined, the one was pure more than 99.4 %Ti and was drawn to 20, 50 and 70 % reduction of area (KS 50) and the other was pure more than 99.5 % Ti and was drawn to 25, 50 and 80 % reduction of area (KS 70) . The results obtained were as follows :
(1) In isothermal recrystallization curves, strength was decreased by two stages, the first gradually and the second rapidly.
(2) Relations between recrystallization temperature and heating time were shown in Fig. 3.
(3) Values of activation energy were calculated from in t-1/T linear relations and were shown in Table 3.
(4) Relation between grain diameter D and heating time t was expressed by an equation of the form D=k tn and values of n were shown in Table 4.
(5) In drawn wires of both KS 50 and KS 70 titanium, the‹10 1 0›direction was parallel to the wire axis and after full annealing, the texture had the‹11 2 0›direction parallel to the wire axis.
