Determination of the optimal coverage for heavy-duty-axle gears in shot peening

Pitting and wear often appear on heavy-duty-axle gears due to their harsh working conditions, such as high torques, loads, poor lubrication. Shot peening is a popular surface strengthening method for gears. In order ensure complete coverage during shot peening, 100~200% usually prescribed most However, it difficult effectively improve the contact fatigue resistance of Generally, increasing can heighten compressive residual stress prolonging service lifetime gears, whereas levels may cause deterioration roughness, thus noise vibration To address this issue, paper deals with determination optimal by experimental tests. The influence integrity analyzed in terms stress, microhardness, morphology, microstructure. results show that maximum increases first then keeps stable increase coverage, value − 1172.10 MPa. microhardness peak obviously beginning slowly rises 747.5 HV1.0. roughness (Ra) decreases initially enhances minimum 0.99 μm under 1000%. crystallite size be refined from 36.88 28.79 nm peening. dislocation density 3.70 × 1016 m−2. Numerous damages (microscalings, spallings) occur treated gear tooth flank affecting distribution levels. Meanwhile, behavior steels investigated, test 1000% lead better resistance. Taking into consideration results,