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EFFECT OF FLUID ENVIRONMENT ON TORSIONAL FATIGUE FAILURE.
Final rept. 2 Mar 64-31 Aug 65,
NUCLIDE CORP MEDFORD MA ALLOYD-GENERAL VACUUM DIV
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The fatigue process was studied in martensitic 52100 steel, martensitic 440C stainless steel and age-hardened beryllium-copper in corrosive water and non-corrosive fluid environments under conditions of cyclic torsional loading. The process of crack nucleation dominated the fatigue process at high strain amplitudes while crack growth was rate determining at low strain amplitudes. Corrosive environment at high strain amplitudes resulted in earlier crack nucleation and failure by formation of corrosion pits at inclusion particles, while in non-corrosive environments fatigue crack nucleation was suppressed with consequent better fatigue resistance. Differences in the S-N curves in non-corrosive environments were rationalized in terms of hydrodynamic and chemical effects. Author
APPROVED FOR PUBLIC RELEASE