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用内部疲劳极限概念，定量分析了碳氮共渗及渗后喷丸对低碳钢疲劳极限的影响，提出了预测疲劳极限和优化工艺准则。
The concept of internal fatigue limit was used to quantitatively analyze the influence of carbonitriding and post-infiltration shot peening on the fatigue limit of mild steel. The prediction fatigue limit and optimization process criterion were proposed.