臺灣博碩士論文加值系統

本研究探討球墨鑄鐵FCD550進行氮化反應前經過不同的預處理，包含珠擊與磷酸鹽處理，對氮化製程效果的影響。首先選擇適當的氮化溫度，選定後將鑄鐵在氮化前以不同尺寸的鋼珠對表面進行珠擊，再進行氮化製程；磷酸鹽預處理的部分則是以磷酸鋅預處理15分鐘、磷酸錳預處理15分鐘和磷酸錳預處理30分鐘，共3種磷酸鹽處理條件，再進行氮化製程。檢測方法則分別是使用微克氏硬度機(Vickers hardness tester)檢測表面硬度和截面硬度分布曲線、X-ray繞射測量儀(XRD)檢測其結晶相種類、金相顯微鏡(OM)進行微觀組織的分析和孔隙率的探討、表面粗度計(Surfcom)檢測珠擊過後的表面粗糙度、應力量測儀(Stress Mea- surement System)檢測珠擊過後產生的壓應力。
針對球墨鑄鐵FCD550，藉由選用三種不同的溫度參數進行氮化製程測試，結果發現在530℃的氮化條件下，可得到最大表面硬度與最低孔隙率。預處理的部分，發現藉由不同珠擊參數進行表面清潔後，使用530℃進行氮化試樣會因為壓應力不同造成不同程度的面粗度，其中0.8mm的鋼珠進行珠擊後的面粗度能些微提升氮化效益。而使用磷酸鹽預處理後再使用530℃進行氮化試樣，會因為不同種類的磷酸鹽處理，而在氮化製程下，產生不同程度的化學反應，而明顯地提升氮化效益，且多孔層較薄。

The purpose for the study was to assess the effects of different Nitriding Pretreatments on the nodular cast iron FCD550, including use the shot peening treatment or phosphate treatment. First of all, testing personnel choose the suitable nitrocarburing temperatures and using different sizes of the steel ball to shot peening (0.15mm, 0.25mm, and 0.8mm steel balls ) the surface of nodular cast iron FCD550 before the cast iron put into Nitriding Pretreatments. Then separately using zinc phosphate for 15 minutes, manganese phosphate for 15 minutes, manganese phosphate for 30 minutes of nodular cast iron FCD550 before the cast iron put into Nitriding Pretreatments.
For shot peening to create six different surface pretreatment conditions, and choose the 530℃ nitrocarburing. Then Vickers Type Tester, X-ray diffraction measuring instrument (XRD), Microscope, surface roughness, shape measuring instrument (Surfcom) and the Stress Measurement System were used for characterization to help figure out the mechanisms
For the graphite cast iron (FCD550), the nitriding process was tested by selecting three different temperature parameters. It was found that the maximum surface hardness and the lowest porosity were obtained under nitriding temperature of 530 °C. In the pretreatment, it was found that sample has different effects on the porous layer after shot peening, and the 0.8 mm steel ball can slightly improve the nitriding efficiency. And in it was found that different phosphate treatment before nitriding have different resulted. The results showed that the phosphate treated sample improves nitriding efficiency and makes the porous layer thinner

總目錄
摘要 i
Abstract ii
總目錄 iii
圖目錄 vi
表目錄 ix
第一章 前言 1
1-1前言 1
1-2實驗動機 2
第二章 文獻回顧 3
2-1氮化熱處理之介紹與種類彙整 3
2-1-1 氣體氮化 5
2-1-2 氣體軟氮化 5
2-1-3 液體軟氮化 8
2-1-4 離子氮化 8
2-1-5 低壓氮化 9
2-1-6 氮化與軟氮化熱處理之原理差異 9
2-1-7 軟氮化之金相組織 15
2-2球墨鑄鐵簡介 18
2-2-1球墨鑄鐵之性質 18
2-2-2球墨鑄鐵之用途 19
2-3氮化前的加工與預處理介紹 19
2-3-1氮化前的工序 19
2-3-2可能產生的汙染 20
2-3-3常用之預處理探討 22
2-3-4珠擊處理 23
2-3-5磷酸鹽處理 24
2-4 應力檢測原理簡介 25
第三章 實驗步驟與方法 26
3-1實驗架構與流程 26
3-2樣品製備 27
3-3軟氮化設備與溫度變數試樣 27
3-4珠擊變數施作與氮化試樣 29
3-5磷酸鹽處理變數施作與氮化試樣 30
3-6分析方法 30
3-6-1鋼和鐵氮化深度量測方法介紹 30
3-6-2顯微硬度量測 31
3-6-3光學顯微鏡觀察 32
3-6-4 XRD量測 32
3-6-5珠擊前後殘留應力量測 33
3-6-6珠擊前後表面粗糙度量測 33
第四章 結果與結論 34
4-1溫度變數之影響分析 34
4-1-1表面硬度量測分析 34
4-1-2硬化深度量測與討論 36
4-1-3金相觀察與討論 40
4-1-4 XRD量測分析 45
4-2珠擊變數之影響分析 46
4-2-1氮化前殘留應力分析與面粗度檢測 46
4-2-2表面硬度量測分析 47
4-2-3硬化深度量測與討論 48
4-2-4金相觀察與討論 52
4-3磷酸鹽處理變數之影響分析 56
4-3-1表面硬度量測分析 56
4-3-2硬化深度量測與討論 58
4-3-3金相觀察與討論 62
4-3-4 XRD量測與討論 66
第五章. 結論 69
參考文獻 70

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