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系統識別號 U0026-2607201912552300
論文名稱(中文) 熱處理對17-4PH不銹鋼氫誘發破裂行為之影響研究
論文名稱(英文) Effect of Heat Treatment on Hydrogen Induced Cracking Behavior of 17-4 PH Stainless Steel
校院名稱 成功大學
系所名稱(中) 材料科學及工程學系
系所名稱(英) Department of Materials Science and Engineering
學年度 107
學期 2
出版年 108
研究生(中文) 林俊宇
研究生(英文) Jyun-Yu Lin
學號 N56064389
學位類別 碩士
語文別 中文
論文頁數 120頁
口試委員 指導教授-蔡文達
口試委員-郭瑞昭
口試委員-陳嘉勻
口試委員-曾傳銘
中文關鍵字 17-4 PH 不銹鋼  氫誘發破裂  氫脆  熱脫附光譜分析  氫捕捉 
英文關鍵字 17-4 PH Stainless steel  Hydrogen Induced Cracking (HIC)  Hydrogen Embrittlement (HE)  Thermal Desorption Spectroscopy (TDS)  Hydrogen Trapping 
學科別分類
中文摘要 本研究探討熱處理對 17-4 PH 不銹鋼氫誘發破裂行為之影響。藉由熱處理其微觀組織與機械強度,於添加1g/L 硫氰化銨的0.5 M 硫酸水溶液中進行陰極定電位充氫試驗,觀察氫誘發破裂行為與其氫固溶量差異。此外,利用熱脫附光譜(TDS)試驗與彈簧拉伸試驗解析氫於材料內之捕捉型態及氫脆化影響。
17-4 PH 不銹鋼透過不同熱處理條件使含銅析出相析出達強度調整,以480 ℃/1h 時效處理擁有最高微硬度與抗拉強度;經580 ℃/1h 時效處理,則因析出物聚集且粗化,使其強度下降。經陰極充氫後原材與經480 ℃ 時效處理試片擁有較高之氫誘發破裂敏感度;至於經過固溶處理或者過時效處理(580 ℃)的17-4 PH 不銹鋼,其氫誘發破裂敏感性則較低。觀察氫誘發裂紋,其起始位置好發於容易捕捉及聚集氫原子的先前沃斯田體晶界、板條狀麻田散體晶界與介在物周圍。熱脫附光譜(thermaldesorption spectroscopy, TDS)分析結果顯示,原材與經480 ℃ 時效處理具有較低的氫原子束縛能,氫原子容易於材料晶格間擴散、聚集在缺陷及應力集中處,提升氫誘發破裂敏感性。而經580 ℃ 時效處理可改變析出物與基地組織兩相介面的結構,提升材料的氫捕捉能力,同時提升總體氫含量;但是氫原子於材料內部晶格間的固溶量則降低,因此氫誘發破裂敏感性降低。彈簧拉伸試驗結果表明,不論何種熱處理,一旦氫滲入17-4 PH 不銹鋼中,皆造成最大抗拉強度、斷面減縮率與伸長量下降。無論是氫誘發破裂或是氫脆之破斷面,皆顯示脆性的沿晶、穿晶、劈裂特徵形貌,換言之,當氫被吸收、固溶於17-4 PH 不銹鋼中,其破裂面形貌由延性轉為脆性特徵。
英文摘要 The microstructure and mechanical properties of 17-4 precipitation hardening (PH) stainless steel (SS) can be modified by heat treatment associated with the precipitation of copper-rich particles in the matrix. Tempering at 480 ℃ for 1h resulted in an increase in hardness and tensile strength but at the expense of high susceptibility to hydrogen induced cracking (HIC). Hydrogen is likely to be absorbed and trapped in interstitial lattice sites, dislocation cores, grain boundaries and incoherent interfaces (commonly associated with inclusions), etc., which can possibly act as initiation sites for HIC but with different propensity. The results of thermal desorption spectroscopy (TDS) analysis showed that hydrogen trapping energy is relatively low after 480 ℃/1h aging treatment, revealing the diffusible nature of absorbed hydrogen. However, the higher susceptibility to HIC could probably attributed to the higher hydrogen content in the dislocation cores or interstitial lattice sites. Aging treatment at 580 ℃/1h caused an increase of the formation of incoherent interfaces, which normally became the irreversible hydrogen trapping sites. As a result, the lattice hydrogen concentration was lowered and a decrease in HIC susceptibility was observed. Spring load tensile testing results indicated that 17-4 PH SS became embrittled by revealing the transition from ductile to brittle fracture if it was cathodically charged with hydrogen, regardless of thermal treatment.
論文目次 摘要 I
Extended Abstract II
致謝 XVI
總目錄 XVII
表目錄 XIX
圖目錄 XX

第一章 前言 1

第二章 文獻回顧 2
2.1 17-4 PH不銹鋼 2
2.2 金屬材料之氫誘發損傷 4
2.2.1 氫的來源 4
2.2.2 氫進入材料內部方式 5
2.2.3 氫捕捉陷阱 6
2.2.4 氫致損傷 7
2.2.5 氫誘發破裂與氫脆理論 8
2.3 熱脫附光譜分析(thermal desorption spectroscopy, TDS) 9
2.3.1 氫原子束縛能 9
2.3.2 溫度與氫捕捉位置之關係 11
2.3.3 氫捕捉位置(陷阱)對氫損傷的影響 11
2.4 高強度鋼之氫脆敏感性 12
2.5 材料破斷形貌分析 12

第三章 實驗方法與步驟 29
3.1 實驗材料及前處理 29
3.2 金相組織觀察 29
3.3 晶體結構鑑定與微硬度量測 29
3.4 動電位陰極極化曲線試驗 30
3.5 電化學充氫試驗 30
3.6 氫含量測定 31
3.7 熱脫附光譜分析試驗 31
3.8 拉伸試驗 32

第四章 結果與討論 37
4.1 熱處理對 17-4 PH不銹鋼之微觀組織與機械性質影響 37
4.1.1 顯微組織分析 37
4.1.2 晶體結構與微硬度分析 38
4.2 電化學充氫對不同熱處理17-4PH不銹鋼性質之影響 38
4.2.1 動電位極化曲線 38
4.2.2 氫固溶對微硬度之變化 39
4.2.3 熱處理對氫含量之影響 39
4.3 17-4 PH不銹鋼之氫的熱脫離 40
4.4 17-4 PH不銹鋼之氫誘發破裂 41
4.4.1 熱處理對氫誘發破裂行為之影響 41
4.4.2 氫致裂紋斷面觀察 42
4.4.3 氫誘發破裂起始位置 43
4.4.4 氫脆敏感性分析 44
4.4.5 氫原子吸收、捕捉與誘發破裂行為之關係 45
4.4.6 臨界氫濃度 46

第五章 結論 86

參考文獻 87

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