Study on large crankshaft medium frequency induction hardening residual stress distribution and its influence on deformation

For the non-destructive testing of residual stress at different depths on the surface of crankshaft components after quenching, an ultrasonic critical refraction longitudinal wave method based on two different frequencies is proposed. The residual stress distribution after quenching and the radial runout were measured respectively. Combined with measuring radial runout, the deformation law under different residual stress distribution is analyzed. The results show that the residual compressive stress induced by quenching will lead to larger radial runout error in the middle of crankshaft components.