含Ni量、渗氮层深度及喷丸强化对42CrMo齿轮弯曲疲劳性能影响研究OA北大核心CSTPCD

Single tooth bending fatigue tests were conducted on 42CrMo gears with different com-binations of Ni content,nitriding hardening depth,and shot peening.The effectiveness of different process combinations on improving the bending fatigue limit of gears was investigated,providing process guidance for gear fatigue resistance manufacturing.Additionally,the contribution of surface hardness,nitriding hardening depth,surface residual stress,and Ni content to the bending fatigue limit of gears with different process combinations was analyzed using the random forest algorithm.A multiple regression model considering surface hardness,nitriding hardening depth,surface residual stress,and Ni content was established to predict the bending fatigue limit of gears.Comparing the predicted values with experimental values,the maximum error is controlled within 7.80％,providing a theoretical basis for the rapid and low-cost assessment of gear bending fatigue limit in engineering applications.