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姓名	蕭仲良(Chung-Liang Hsiao)  查詢紙本館藏	畢業系所	機械工程學系
論文名稱	積層製造17-4 PH不鏽鋼之製程參數探討與高週疲勞性質研究 (Study on the process parameters and high cycle fatigue properties of 17-4 PH stainless steel fabricated by additive manufacturing)
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摘要(中)	本研究以中等的雷射功率範圍 (120 W - 180 W) 對 17-4 PH 不鏽鋼進行選擇性雷射熔融積層製造。針對不同製程條件下之工件，比較其密度、硬度、表面粗糙度、金相與孔洞率。然後選取一組材料強度較高與孔洞率較少的參數組合，量測該工件之拉伸、固定負荷振幅疲勞及變動負荷振幅疲勞性質，並探討其疲勞壽命預測模式。 研究結果顯示，在密度、硬度、表面粗糙度、孔洞率方面，當列印能量密度越高時，材料會呈現較高的密度值，與較高的硬度值。同時還有較低的表面粗糙度，與較少的孔洞率。列印參數組合為雷射功率 140 W、掃描速率 800 mm/s、掃描間距 80 μm、層厚 30 μm 之試件具有較高材料強度與較少孔洞率。本研究的選擇性雷射熔融積層製造工件的疲勞 S-N 曲線雖然小於鍛造試件，但是大於採用其他雷射功率 (250 W、220 W、48 W) 列印的工件。在固定負荷振幅疲勞方面，平均應力之修正以採用 Soderberg 方程式為最佳。在變動負荷振幅疲勞方面，不論是傳動軸歷程或支架歷程，Soderberg 修正式及 Goodman 修正式皆適用於預測 17-4 PH 不鏽鋼積層製造工件之疲勞壽命。
摘要(英)	In this study, selective laser melting (SLM) manufacturing was performed on 17-4 PH stainless steel in a moderate laser power range (120 W - 180 W). The density, hardness, surface roughness, metallography and porosity of the workpiece under different processing conditions were compared. Then a combination of the process parameters is selected, which has higher strength and less porosity. The properties of tensile, constant load amplitude fatigue and variable load amplitude fatigue were measured, and the fatigue life prediction model was discussed. The results show that the higher the printing energy density is, the higher the density and hardness will be. At the same time, it also has lower surface roughness and less porosity. The test sheet with laser power 140 W, scanning speed 800 mm/s, hatching spacing 80 μm, and layer thickness 30 μm has higher strength and less hole ratio. The S-N curve of the specimens in this study is lower than that of the wrought specimen, but it is higher than the curves printed by SLM with other laser powers (250 W, 220 W, 48 W). The Soderberg equation is the best method to correct the mean stress effect under constant amplitude fatigue loading. Soderberg′s mean stress modification or Goodman′s mean stress modification methods are applicable to predict fatigue life of 17-4 PH workpiece produced by SLM, whether transmission or bracket load histories developed by the Society of Automotive Engineers.
關鍵字(中)	★ 17-4 PH 不鏽鋼 ★ 選擇性雷射熔融製造 ★ 積層製造 ★ 疲勞性質 ★ 平均應力 ★ 變動負荷振幅疲勞 ★ 疲勞壽命預測模式	關鍵字(英)	★ 17-4 PH stainless steel ★ selective laser melting manufacturing ★ additive manufacturing ★ fatigue properties ★ mean stress ★ variable load amplitude fatigue ★ fatigue life prediction model
論文目次	摘要 I ABSTRACT II 誌謝 III 目錄 IV 圖目錄 VII 表目錄 XI 符號說明 XII 第一章 緒論 1 1.1 研究動機與目的 1 1.2 文獻回顧 6 1.2.1 積層製造析出硬化型不鏽鋼之微結構 6 1.2.2 積層製造析出硬化型不鏽鋼之機械性質 6 1.2.3 傳統製造 17-4 PH 工件之疲勞性質 7 1.2.4 積層製造 17-4 PH 工件之高週疲勞 7 第二章 理論說明 9 2.1 應力-壽命曲線 10 2.2 高週疲勞分析法 (應力-壽命法) 11 2.3 平均應力的影響 13 2.4 循環計數法 15 2.5 疲勞損傷累積 17 2.6 變動負荷振幅歷程 18 2.7 訊號壓縮 19 2.8 循序疲勞分析法 21 第三章 研究方法 23 3.1 研究流程 23 3.2 實驗試件製備 24 3.2.1 17-4 PH 不鏽鋼粉末 24 3.2.2 選擇性雷射熔融積層製造 25 3.2.3 熱處理 29 3.3 密度量測 31 3.4 硬度量測 32 3.5 表面粗糙度量測 33 3.6 拉伸實驗 34 3.7 固定負荷振幅疲勞實驗 35 3.8 變動負荷振幅疲勞實驗 36 3.9 金相、孔洞率與破斷面觀察 37 第四章 結果與討論 40 4.1 積層製造製程參數探討 40 4.1.1 密度、硬度及表面粗糙度 40 4.1.2 列印能量密度與密度、硬度及表面粗糙度之關係 42 4.1.3 較佳製程參數選擇 45 4.2 金相及孔洞觀察 48 4.2.1 金相位置標示方法 48 4.2.2 不同雷射功率的試件 49 4.2.3 不同掃描速率的試件 54 4.2.4 不同掃描間距的試件 57 4.2.5 不同列印能量密度的試件 60 4.2.6 不同密度的試件 63 4.2.7 不同硬度的試件 65 4.2.8 不同表面粗糙度的試件 67 4.2.9 有無熱處理的試件 69 4.3 拉伸性質 70 4.4 固定振幅高週疲勞性質 73 4.4.1 應力-壽命線 73 4.4.2 平均應力-應力振幅圖 (Haigh Diagram) 79 4.5 變動振幅高週疲勞性質及壽命預測 81 4.5.1 傳動軸 (TRN) 負荷歷程 82 4.5.2 支架 (BRK) 負荷歷程 84 4.6 破斷面觀察 86 4.6.1 拉伸試件 86 4.6.2 固定振幅疲勞試件 (R = -1) 89 4.6.3 變動振幅 TRN 歷程疲勞試件 91 4.6.4 變動振幅 BRK 歷程疲勞試件 93 第五章 結論 95 第六章 未來研究方向 97 參考文獻 98
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指導教授	黃俊仁(Jiun-Ren Hwang)	審核日期	2022-8-1
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