Abstract
Mechanical fatigue crack growth characteristics of a Ti-49.7at.%Ni-1.38at.%Co alloy were investigated as a function of heat-treatment and test temperature. The fatigue crack growth characteristics of the alloy were examined as to center-cracked-tension type specimens by using a computer controlled servo-hydraulic type machine For the 623 K aged alloy ( M s = 297 K ), the crack growth resistance decreases with decreasing test temperature, and that at 320±1 K shows the best performance than those at lower test temperatures The best performance for the 623 K aged alloy was comparable to the performance of 723 K aged alloy ( M s = 272 K ) tested at 295±1 K. Fatigue fracture surfaces of the aged alloys were examined by using a scanning electron microscope with a field emission electron gun, and striation patterns were observed on them. The micro crack growth rate estimated from the striation patterns was in good agreement with the crack growth rate obtained from the examination of center-cracked-tension type specimens.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call