Abstract
Creep rupture properties have been invertigated on the vacuum annealed forged bar of commercially pure titanium KS-70. They were prepared by a consumable electrode double melting method within the temperature range from 200 to 800°F (93 to 427°C). (have been investigated.) The results are summerized as follows: (1) In the temperature range from 400 to 600°F (204 to 316°C) the temperature graph of creep rupture strength is indicated by an extremely gentle slope, compared with that of short time tensile strength. (2) The causes of this indication are possibly considered to be the strain hardening, the precipitation hardening influenced by foreign matters of extremely small amount in test material and so on, but they must under go a further study so as to be made decidedly clear. (3) However, it is confirmed by the investigation on hardness and by the analysis that hardening phenomena by oxidation did not occur on the occasion.
