Citation:
P. Hancock, J.R. Nicholls, K. Mahmood, The influence of imposed strain rate on fracture of surface oxides, Corrosion Science, Volume 35, Issues 5-8, Advances in Corrosion and Protection, 1993, Pages 979-981, 983-987
Abstract:
The mechanical properties of chromium rich scales formed on 304 stainless steel
have been investigated as a function of deformation rate and operating
temperature. At 900C at slow strain rates < 10-6 per second no cracking
was observed at strains up to 10%. At rapid strain rates in excess of 10-4 per
second oxide cracking was found to be independent of strain rate and controlled
by the fracture toughness of the oxide. In the intermediate region, with strain
rates between 10-4 per second and 10-6 in the temperature range 700 to 950C,
the behaviour is determined by the creep deformation and fracture mode of the
oxide. The mechanism of surface oxide failure is examined and an equation to
predict cracking density over the full range of both monotonic tensile and creep
fracture modes is sugg