1994 Volume 60 Issue 575 Pages 1493-1497
Rotating bending fatigue tests were conducted on finished (material A) and electropolished (material EA) austempered ductile iron. The S-N curve of material A represented combined fracture, whose starting points of fracture is on the surface layer for a small number of cycles and is an internal defect for a very high number of cycles. On material EA, the structural sensitivity is lower than on material A, and is of a similar degree to 90% pearlite ductile iron. In the horizontal transitional part, the crack does not propagate to a significant extent. Due to the difference of matrix structure, the fatigue strength of the bainitic matrix is 25% higher than that of the 90% pearlite matrix structure.
TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C
TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B
TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A
Transactions of the Japan Society of Mechanical Engineers Series C
Transactions of the Japan Society of Mechanical Engineers Series B
