EFFECTS OF MICROVOIDS, OXIDE INCLUSIONS, AND SULFIDE INCLUSIONS OF THE FATIGUE STRENGTH OF WHEEL STEELS

摘要

1. Murikami and Endo have demonstrated that the endurance limits of steels are reduced by the maximum area of micro defects. 2. If the average area of voids, oxide inclusions, and sulfide inclusions are a measure of the maximum area, then the Murikami equation can be modified to give an estimate of the endurance limit. 3. These calculations show that a 7- to 10-percent reduction in endurance limit may occur between a wheel steel with an existing average discontinuity area and a wheel with the largest inclusion area. 4. There is a 20-percent lowering of the calculated endurance limit between the minimum and maximum void and sulfide average areas.