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STRESS CORROSION CRACKING IN HIGH STRENGTH FERROUS ALLOYS
GENERAL DYNAMICS CORP FORT WORTH TX
This paper describes tests performed to investigate the stress corrosion cracking of AISI Type 4340 steel in the 260,000 to 292,000 psi strength range. Various protective coatings were evaluated comparatively on the basis of a sustained axial tensile load equivalent to 70 of the ultimate strength. Round, tensile-type specimens tested the coatings as applied to a machined or shot-peened surface by alternate immersion in 5 salt water. The results indicated that the peened surface had more resistance to cracking than the machined surface.
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