The Effect of Manganese Phosphate Coatings on Fatigue Crack Initiation
Final technical rept.
ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS
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The effect of a manganese phosphate coating on the fatigue crack initiation life of ASTM A723 high strength steel was determined. The phosphate coating process creates pitting stress concentrators on the surface that cause a dramatic reduction in crack initiation life. This deleterious effect on fatigue life increases as the applied stress level decreases. Keywords Crack Initiation, Fatigue, High strength steel, Manganese phosphate, Shot peening.