Abstract
The effect of loading mode on the susceptibility of Zircaloy-2 to stress corrosion cracking has been examined in CH3 3OH containing 0.4 vol.% of concentrated HCl. Experiments were performed under constant strain conditions using an Instron Tensile Testing Machine and a Torsion Testing device. Susceptibility was found to be much greater under tensile loading (mode I) than torsion loading (mode III), being both transgranular and intergranular in the former but only intergranular in the latter. The addition of a cathodic poison, SeO 2, increased the amount of transgranular cracking and increased susceptibility under mode I conditions while such additions had no effect under mode III conditions. The differences are interpreted as arising from absorbed hydrogen promoting transgranular cleavage while intergranular cracking is caused by dissolution.
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