Abstract
For three types of induction-hardened shafts with different effective case depths, we measured the hardness distribution and observed the microstructure to quantitatively evaluate the effective case depths. The distribution of axial residual stress on the cross-section was measured by contour method. It was found from comparison between hardness and residual stress distributions that the maximum tensile residual stress occurs at a position equivalent to the hardness of the inner non-hardened material.
