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Student Number 90323011
Author Po-Fu Kuo(郭柏甫)
Author's Email Address s0323011@cc.ncu.edu.tw
Statistics This thesis had been viewed 2423 times. Download 1354 times.
Department Mechanical Engineering
Year 2002
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title Notch Effect on High-Cycle Corrosion Fatigue for AISI 347 Stainless Steel
Date of Defense 2003-06-27
Page Count 86
Keyword
  • corrosion fatigue
  • localized acidification
  • multiple crack initiation sites
  • notch effect
  • Abstract The aim of this study is to investigate the influence of notch effect on the high-cycle corrosion fatigue properties of AISI 347 stainless steel in various environments, namely, air, water, NaCl, NaCl plus inhibitor, and H2SO4 solutions. The effect of load ratio on the high-cycle corrosion fatigue behavior was also studied for smooth specimens. Fractography analysis with scanning electron microscopy (SEM) was conducted to investigate the fatigue fracture modes.
    Results showed that the fatigue lives in various specimen geometries tested in air and four aqueous environments were decreased with increasing stress concentration factor, and the fatigue notch sensitivity among the corrosion environments was higher in water and 3.5% NaCl solution added with inhibitor. For smooth and semi-circular notch specimens, the rank of fatigue strength in the given environments took the following order: air > salt water plus inhibitor > water > salt water > sulfuric acid solution. For V-notch specimens, the S-N curves were separated into two groups; i.e., one group with air and 3.5% NaCl plus inhibitor and the other with water, 3.5% NaCl and H2SO4. This was attributed to a greater effect of localized acidification occurring at the root of V-notch as compared to smooth shape and semi-circular notch.
    For R = 0.1 and 0.5, the fatigue strength of smooth specimen showed the lowest value in H2SO4 solution while at R = -1 with zero mean stress, the fatigue strength was no significant difference among the given environments. A parameter incorporating with the maximum stress, stress amplitude and highly stressed volume (or area) was introduced and well correlated with the fatigue life of various specimen geometries in the given environments. Fractography analysis results indicated the multiple crack initiation sites were found in V-notch specimens whiles single crack initiation site was observed for smooth and semi-circular notch specimens at low applied stress levels.
    Table of Content 第一章 簡介1
    1-1 研究背景1
    1-2 腐蝕疲勞機構2
    1-3 沃斯田鐵系不袗腐蝕疲勞性質文獻回顧5
    1-4 腐蝕環境與缺口效應7
    1-5 研究目的11
    第二章 實驗方法與程序13
    2-1 材料及試片製作13
    2-2 固溶退火熱處理13
    2-3 實驗環境13
    2-4 軸向疲勞試驗14
    2-5 凹槽應力集中因子(Kt)之計算14
    2-6 凹槽處pH值量測15
    2-7 破斷面觀察16
    第三章 結果與討論17
    3-1 不同應力比對高週腐蝕疲勞的影響17
    3-2 缺口效應對高週腐蝕疲勞的影響19
    3-3 缺口效應整合模式24
    3-4 破斷面之SEM觀察25
    第四章 結論28
    參考文獻29
    Tables34
    Figures38
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  • Chih-Kuang Lin(林志光)
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    Date of Submission 2003-07-03

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