摘 要
本文主要探討AISI D2工具鋼經放電加工 (EDM) 與氮化鈦被覆(TiN Coating) 處理後之疲勞壽命，建立損傷模式以預測放電加工製程對疲勞壽命之影響。實驗結果顯示放電加工試件的壽命比機械拋光試件低，此乃歸因於放電加工時，試件表面產生微裂紋與表面粗度惡化等加工損傷。研究亦證實模式的預測值與實驗結果一致。此外也進行研究放電加工試件以物理蒸鍍法 (Physical Vapor Deposition) 施以氮化鈦被覆處理對疲勞壽命之影響，量測分析其表面硬度、表面粗度、殘留應力與疲勞強度。實驗結果顯示放電加工試件施以氮化鈦被覆處理後其硬度顯著增加、表面精度改善、表面的殘留拉應力降低，甚或產生殘留壓應力於表面，因而促使疲勞限(Fatigue Limit) 增大。本研究建議可採用氮化鈦被覆處理的方法，改善放電加工試件之疲勞壽命。

ABSTRACT
An investigation into fatigue strength of electrical discharge machined and TiN-coated AISI D2 tool steel is conducted. The damage model is constructed to reveal the influence of electrical discharge machining conditions on the fatigue life. The experimental results show that the fatigue life of the EDMed specimens is reduced compared to the mechanically polished samples. It is attributed to the rough surface and micro damage in the resolidified surface layer produced by EDM. The predicted results agree fairly well with the experimental results. The effects of titanium nitride (TiN) coating by physical vapor deposition (PVD) after EDM on the fatigue life is further investigated. The experimental results indicate that EDMed specimens coated by TiN exhibit considerably increased hardness, improved surface finish, and decreased superficial tensile residual stress, or added compressive residual stress on the surface, leading to extended fatigue limit. The TiN coating is recommended as an effective method for improving the fatigue life of tool steel being electrical discharge machined.

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