Influence of Geometric Parameters On Residual Stress in Hollow Cylindrical Parts Subjected to Induction Surface Hardening

Hollow cylindrical parts are considered in order to investigate the influence of geometry on residual stress in components hardened by induction. The simplicity of the considered geometry allows analytical derivation of relationship between residual stress and parameters such as hardening depth, distribution of plastic strain, internal and external diameters of a part and direction of hardening. Numerical computations based on proprietary FEM software and derived criteria are used to show relationships between parameters of induction surface hardening and residual stress. Cases susceptible to formation of harmful tensile stress are identified. Special attention is paid to cases of big hardening depths and internal hardening. The possibility to influence the residual stress distribution by induction heating and controlled quenching is demonstrated by simulations.