臺灣博碩士論文加值系統

雷射熔覆處理可做為良好的表面改質方法，且可得到比原先基體材料更為優秀的性質，故雷射熔覆適用於需要維修、翻新及增強機械性質之零組件，而近年來已廣泛應用於工業模具、航空業、鐵軌等相關產業。
本研究使用同軸送粉方式，並調控相同製程參數於預熱後的高速鋼(SKH-9)基體材料表面上使用連續式光纖雷射進行五種不同碳化鎢粉末配方進行雷射熔覆處理，以混合實驗設計方法規畫實驗，分析熔覆層橫截面顯微下孔洞分佈率、微小維克式硬度量測，並將實驗結果數據輸入實驗設計分析軟體，進行實驗結果數據分析與檢定，最後求解最佳混粉比例參數組合。

Laser cladding treatment can be an excellent method of surface modification to achieve better properties of the original substrate material. Therefore, laser cladding is suitable for parts and components that require repair, refurbishment, and enhanced mechanical properties. In recent years, it has been widely used in industrial tooling, aerospace industry, railroad tracks, and other related industrial fields.
In this study, laser cladding of five different tungsten carbide powder formulations was performed on the surface of preheated high-speed steel (SKH-9) by using a continuous fiber laser with the same process parameters and coaxial powder feeding. A mixture experimental design was used to analyze the microporosity distribution rate in the cross-section of the cladding layer, and micro-Vickers hardness measurements were performed. The results were entered into the experimental design and analysis software for analysis and verification of the experimental data to finally find the best combination of parameters for the mixing ratio.

摘要........... i
Abstract...........ii
誌謝...........iii
目錄...........iv
表目錄...........vii
圖目錄...........viii
符號說明...........xii
第一章 緒論...........1
1.1 前言...........1
1.2 研究動機...........1
第二章 文獻回顧...........2
2.1 雷射表面處理...........2
2.1.1 雷射熔覆技術...........2
2.1.2 熔覆參數的影響...........4
2.2 熔覆層缺陷產生...........5
2.2.1 基板預熱...........5
2.3 熔覆材料...........6
2.3.1 碳化鎢...........6
2.3.2 複合粉末...........6
2.4 六個標準差...........6
2.4.1 變異數分析(ANOVA)...........6
2.4.2 殘差分析與診斷圖...........7
2.4.3 影響度分析...........7
第三章 實驗流程與方法...........8
3.1 實驗流程...........8
3.2 實驗設計...........9
3.3 雷射熔覆材料...........10
3.3.1 基體材料...........10
3.3.2 熔覆粉末...........10
3.4 雷射熔覆製程...........11
3.4.1 雷射熔覆設備...........11
3.4.2 雷射熔覆參數...........13
3.5 金相顯微結構觀察...........13
3.6 熔覆層硬度量測...........14
第四章 結果與討論...........15
4.1 金相顯微結構...........15
4.1.1 孔洞率分析...........23
4.2 微小維克氏硬度量測...........24
4.3 ANOVA分析...........25
4.4 殘差分析...........27
4.4.1 殘差常態機率圖檢查...........27
4.4.2 殘差與預測值檢查...........28
4.4.3 殘差與實驗次數檢查...........28
4.4.4 預測值與實際值檢查...........29
4.4.5 BOX-COX轉換檢查...........30
4.4.6 殘差與因子檢查...........31
4.5 影響度分析...........33
4.5.1 LEVERAGE與實驗順序檢查...........33
4.5.2 DFFITS與實驗順序檢查...........34
4.5.3 DFBETAS與實驗順序檢查...........35
4.5.4 COOK’S DISTANCE與實驗順序檢查...........36
4.6 實驗數據分析結果...........37
4.6.1 最佳比例參數設定...........37
4.6.2 最佳比例參數組合...........38
4.7 最佳化參數驗證...........39
4.7.1 最佳化參數驗證實驗規劃...........39
4.7.2 最佳參數粉末孔洞率分析...........41
4.7.3 最佳參數粉末微小維克式硬度量測...........42
第五章 結論...........43
5.1 結論...........43
5.2 未來展望...........43
參考文獻...........44
Extended Abstract...........46

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