Abstract
Two-dimensional AE location has been carried out at delayed cracking tests of annealed Ti-6Al-4V alloys in air to determine crack growth along the thickness of CT specimens and unveil the delayed cracking behavior. AE events are measured during the tests with four-channel system. AE events are generated nearly at the surface of the specimens and then at the center of the specimens in the delayed cracking tests. In fracture toughness tests, AE events are generated mainly at the center of the specimens in the first stage. It is concluded that the delayed cracking occurs at the surface of the specimens mainly due to moisture adsorption in air.
