Resumo:
It was studied the influence of Duplex Aging Heat Treatment in the susceptibility to stress
corrosion cracking of the Ti-6Al-4V alloy submerse in methanol (CH3OH). For comparison
reasons, it was carried out a similar procedure in annealed and single aged samples. In order
to evaluate the stress corrosion susceptibility, it was performed the Constant Load Stress
Corrosion Cracking Test, followed by a microstructural evaluation with optical and scanning
electron microscopy (SEM) aid. Additionally, for the evaluation of the influence of solutionaging
heat treatments in alloy strength, hardness tests were carried out in samples submitted to
all different heat treatment conditions (annealed, single aged and duplex aged). The hardness
tests showed a substantial increase in strength after heat treatment, the stress corrosion test
indicated positive change in corrosion resistance after the second stage of aging (duplex
aging).
