二次回火后硬度变化不大，三次回火后，硬度反而降低。
Two times temper has little effect on the hardness, three times temper will decrease the hardness.
在应变疲劳曲线上，弹性线和塑性线的交点随弹簧钢回火后硬度的升高而向低循环寿命移动；
The point of intersection of elastic line and plastic line moves toward the low cycle life with the hardness of the spring steel raised after tempering from the strain fatigue curve.
通过合并磨削热模型和回火效应可以预测工件磨削后的表面硬度变化。
Combining the tempering behavior with the grinding thermal model, the change in surface hardness due to grinding heat could be predicted.
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