The Effect of a Thin Diffused Solute Layer on the Nucleation of Fatigue Cracks.
Progress rept. 1 Oct 71-1 Oct 72,
DELAWARE UNIV NEWARK DEPT OF MECHANICAL AND AEROSPACE ENGINEERING
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Small alterations in the surface conditions of Ti-6Al-4V can have significant effects on the fatigue life. A critical amount of dissolved oxygen near the surface was more effective than diffused aluminum. A combination of solute hardening, twin formation and grain boundary effects seem, at this time, to be the major controlling factor in the surface retardation of the nucleation of fatigue cracks. High vacuum will increase fatigue life greatly. The lifetime in high vacuum appears to be due to the growth of the cracks and not the nucleation process.
- Metallurgy and Metallography