臺灣博碩士論文加值系統

本研究旨在探討珠擊法中介質粒徑與處理時間對套筒疲勞壽命的影響。珠擊法是一種通過連續衝擊金屬表面以增強其疲勞性能的表面處理技術。本文選用不同粒徑的變韌鐵珠(0.3 mm、0.6 mm、0.8 mm)，並設定兩種處理時間(5 min、10 min)，對套筒進行珠擊處理，旨在分析不同參數下的疲勞壽命改善效果。
研究首先利用CREO模擬軟體對套筒在實際使用過程中的應力集中區域進行分析，確定高應力區域以便於後續實驗觀察。接著，對經過珠擊處理的套筒進行一系列測試，包括殘留應力測量、表面粗糙度測量、硬度測試、金相觀察及疲勞壽命測試。
晶粒組織觀察結果中，較大粒徑的珠擊處理在外壁產生了明顯的晶粒變形與細化，特別是在0.8 mm粒徑下，處理時間越長，影響深度越大。此外，粗糙度測試結果顯示，隨著粒徑增大，表面粗糙度明顯上升，但延長處理時間可以在一定程度上減少粗糙度。硬度測試結果表明，經過珠擊處理的樣品表層硬度顯著提升，且粒徑越大，硬度提升幅度越大。
殘留應力測量結果顯示，使用較小粒徑的珠擊處理能在套筒內壁引入更高的壓縮殘留應力，以0.3 mm粒徑處理後可得到最高-739 Mpa壓縮應力。疲勞壽命測試結果證實，不同粒徑和處理時間的珠擊處理均能顯著延長套筒的疲勞壽命，其中0.3 mm粒徑和10分鐘處理時間的組合效果最佳，其原因為高壓縮殘留應力有助於抵消外部載荷引起的拉應力，從而減少應力集中現象，提高材料的疲勞壽命。

This study investigates the impact of peening shot size and peening time on the sleeve socket fatigue life after shot peening treatment. Different sizes of Banitic steel shots (0.3 mm, 0.6 mm, 0.8 mm) and two treatment durations (5 minutes, 10 minutes) were selected for experiment and analysis.
CREO simulation software was used to identify the high stress area of the socket before experiments, and the result was used for the subsequent observation. Examinations of peened socket included the residual stress, surface roughness, hardness, microstructure, and fatigue life testing.
Microstructure results showed significant grain deformation and refinement on the outer surface after peening. The larger shot sizes and longer treatment times, the deeper the deformed depth. Surface roughness increased with shot size but decreased with the longer peening time. Surface hardness increases significantly, and it related to the shot size positively.
Residual stress results indicated that smaller shot sizes induced higher compressive residual stresses below the surface. The highest stress -739 MPa was measured on the sample with 0.3 mm shots. Fatigue life tests confirmed that all shot peening conditions significantly extended sleeve fatigue life. The combination of 0.3 mm shot size and 10 minutes peening time provided the best results, due to the highest compressive stress which counteracted the external loading tensile stress, reducing stress concentration and enhancing the fatigue life.

摘要 i
Abstract ii
目錄 iii
表目錄 v
圖目錄 vi
第一章 前言 1
第二章 文獻回顧 4
2-1 珠擊法 4
2-1-1 珠擊法原理 4
2-1-2 珠擊法種類 5
2-1-3 珠擊強度量測-阿爾曼試片 7
2-1-4 粒徑尺寸對疲勞壽命的影響 9
2-1-5 珠擊時間對疲勞壽命的影響 11
2-2 套筒製程對疲勞壽命的關聯 13
2-3 CREO Simulation失效分析 16
2-4 殘留應力對疲勞壽命影響 21
第三章 實驗材料與方法 25
3-1 實驗流程 25
3-2 試片製備 26
3-2-1 套筒材料選擇 26
3-2-1 珠擊法設定 28
3-3 實驗試片特性分析 31
3-3-1 Creo simulation 31
3-3-1 珠擊強度分析 32
3-3-2 表面粗糙度量測 33
3-3-3 光學影像顯微組織觀察 34
3-3-4 維克氏硬度測試 35
3-3-5 殘留應力量測 35
3-4 套筒壽命測試 37
第四章 結果與討論 40
4-1 Creo模擬結果 40
4-2 珠擊強度-阿爾曼氏片分析 42
4-3 套筒內外壁晶粒組織變化 44
4-4 套筒內外壁珠擊後粗糙度分析 48
4-5 珠擊後套筒硬度分布 50
4-6 珠擊後套筒殘留應力分析 51
4-7 套筒疲勞壽命測試結果討論 53
第五章 結論 56
第六章 未來研究方向 57
參考文獻 58

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