锻压技术

残余应力对SAE9310钢航空齿轮弯曲疲劳寿命的影响

英文标题：Influence of residual stress on bending fatigue life for SAE9310 steel aviation gears

分类号：TG162

出版年,卷(期):页码：2024,49(8):255-262

摘要：

为提升航空齿轮弯曲疲劳性能，通过渗碳热处理等强化措施引入残余压应力是关键工艺技术。为揭示齿轮渗碳热处理性能梯度对弯曲疲劳的影响，运用测试技术和寿命统计方法，针对SAE9310钢航空齿轮在单齿脉冲弯曲疲劳试验中的疲劳寿命进行分析，研究渗碳热处理后齿轮的硬度梯度、表面残余应力对其弯曲疲劳寿命的影响。结果表明，残余应力增益量较大的齿轮的弯曲疲劳寿命明显增加，且近表层硬度梯度增长速率较大，易导致硬度峰值前端硬点分布，造成裂纹路径非平滑扩展。齿面残余应力的预测疲劳寿命与试验结果一致，验证了齿面残余压应力是影响弯曲疲劳寿命的主要因素，为航空齿轮的设计和制造提供了重要的理论依据和实践指导。

To enhance the bending fatigue performance of aviation gear, introducing the residual compressive stress through strengthening measures such as carburizing heat treatment is the key process technology. Therefore, in order to reveal the influence of the gradient of gear carburizing heat treatment performance on bending fatigue, the fatigue life of SAE9310 steel aviation gears in single-tooth impulse bending fatigue test was analyzed by using the test techniques and the method of life statistics, and the influences of hardness gradient and surface residual stress on the bending fatigue life of gears after carburizing heat treatment were investigated. The results show that the bending fatigue life of gears with larger residual stress increment is significantly increased, and the near-surface hardness gradient growth rate is higher, which can easily lead to the distribution of hard points at the front end of hardness peak, resulting in non-smooth propagation of crack point. The predicted fatigue life considering the residual stress on the tooth surface is consistent with the test results, verifying that the residual compressive stress on the tooth surface is the main factor affecting the bending fatigue life, and providing important theoretical basis and practical guidance for the design and manufacture of aviation gears.

基金项目：

河南省科技攻关项目 (222102220110)

作者简介：关荣鑫(1984-), 男, 硕士,高级工程师 E-mail：guanrongxin@163.com 通信作者：职彦锋（1985-），男，学士,高级工程师 E-mail：zhisir@qq.com

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