The compressive residual stress on the gear tooth’s surface, a vital parameter to control mechanical properties, such as strength, has a beneficial effect on the component’s fatigue life. A novel procedure, double induction quenching (DIQ), effective for improving the fatigue strength of gear products, has been used for producing gears with steep gradients of compressive residual stress generated in the tooth surface. We performed a Bragg edge imaging experiment at a pulsed neutron source to determine the spatial distribution of the {1 1 0} lattice spacing (d₁₁₀) and the broadening of the {1 1 0} Bragg edge (w₁₁₀) on the DIQ gear product after tooth-bending fatigue tests to which different loading cycles were applied. No significant difference occurred in the d₁₁₀ and the w₁₁₀ at Hofer’s critical section (tensile side) of the teeth with different loading conditions within the accuracy of data analysis. However, we detected a decrease in the w₁₁₀ and changes in the residual lattice strain distribution in the axial direction (through the thickness) along the tooth root directions at the opposite side of Hofer’s critical section for both teeth after 3 × 10⁵ and 8 × 10⁵ cycles, relieving the compressive residual stresses during the fatigue process. The residual stress close to the gear tooth surface determined by X-ray diffraction using sequential polishing showed a slight relaxation and redistribution from the tensile side in the hoop direction, complementary to the neutron Bragg edge imaging information in the axial direction.

轮齿表面的残余压应力是控制强度等机械性能的重要参数，对部件的疲劳寿命具有有益影响。一种新颖的双感应淬火 (DIQ) 工艺可有效提高齿轮产品的疲劳强度，已用于生产在齿面产生陡峭压缩残余应力梯度的齿轮。 我们在脉冲中子源进行了布拉格边缘成像实验，以确定 {1 1  0} 晶格间距 ( d ₁₁₀ )的空间分布和 {1  1  0} 布拉格边缘( w ₁₁₀) 在 DIQ 齿轮产品上进行了不同加载循环的齿弯曲疲劳试验。在数据分析的精度范围内，不同加载条件下牙齿Hofer临界截面（拉伸侧）的d ₁₁₀和w ₁₁₀没有发生显着差异。^{然而，我们检测到 3×10 5}和 8后两个齿的w ₁₁₀减小和轴向（通过厚度）沿齿根方向的残余晶格应变分布在 Hofer 临界截面的另一侧发生变化× 10 ⁵循环，消除疲劳过程中的压缩残余应力。使用顺序抛光通过 X 射线衍射确定的接近齿轮齿面的残余应力显示出从拉伸侧沿环向方向的轻微松弛和重新分布，与轴向方向的中子布拉格边缘成像信息互补。