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THE EFFECT OF TEMPERING ON THE FATIGUE BEHAVIOR FOR MEDIUM CARBON STEEL | ||
| Iraqi journal of mechanical and material engineering | ||
| Article 1, Volume 11, Issue 4, 2011, Pages 750-774 | ||
| Authors | ||
| Abdul Allah Daiaa; Salman H. Umran | ||
| Abstract | ||
| Abstract This research is concerned with the study of the effect of tempering on the fatigue strength of medium carbon steel (CK 45), by using different heat treatments including quenching in water and oil followed by tempering at (250, 450 & 650) oC comparisons between the effects of two mediums on microstructure, mechanical properties and fatigue strength for each quenching media . The fatigue tests have been done under constant amplitude stresses with a stress ratio (R=-1). The experimental results reveal that water quenching followed by tempering at 250 oC (1 hr) gives maximum fatigue strength for steel, and this is due to the formation of tempered martensite. Long fatigue cracks have been measured and studied from using fractography of fatigue specimens (SEM). Two models have been to proposed to assess fatigue lives of quenched and tempered medium carbon steel at different tempering temperature . The first model was derived from the fatigue crack growth rate equation (da/dN) while the second model was extracted from the stress intensity factor equation (K) . | ||
| Keywords | ||
| fatigue; tempering; Medium carbon steel | ||
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