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Student Number 93333029
Author Chen-Feng Wang(王志峰)
Author's Email Address rickcfwang@hotmail.com
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Department Executive Master of Mechanical Engineering
Year 2005
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title Hydrogen Embrittlement
in
Material of Needle Roller Bearing Cage with Plating
Date of Defense 2006-07-05
Page Count 103
Keyword
  • Bearing
  • Hydrogen embrittlement
  • Plating
  • Abstract Hydrogen embrittlement is a serious problem of metal after plating process in engineering. The cage of needle roller bearing, it applies to high speed and high performance engine, usually has silver or copper plating to reduce the friction and heating. The “baking” process is working to rid metal of hydrogen. We can use the “hydrogen determination” and “OE-GDS” to study the baking effect of hydrogen consistency in SCM-415. We find short time baking process only cause the hydrogen re-distribution in this metal and the hydrogen trap will effect the result. 
    From result of tensile and SSRT notch tensile test, we find the HE will cause reducing ductility of material. Including Intergranular, dimple and quasi-cleavage will appear in the fractography of test, and depend on hydrogen concentration position. Most failure modes of HE are the intergrainular fracture.
    Table of Content 一、 前言................................................................................................. 1
    1.1簡介....................................................................................................1
    1.2 滾針保持架型滾針軸承簡介…………………………………...…2
    1.3 保持架電鍍流程簡介…………………………………………...…5
    1.4氫脆與應力腐蝕簡介………………………………………...…….9
    1.4.1氫脆簡介…………………………………………….…...……9
    1.4.2 氫脆理論………………………………..……………………10
    1.4.3 氫破壞種類及原因…………………………………..…...….11
    1.4.4 應力腐蝕簡介…………………………….…………..……..15
    1.4.5 應力腐蝕機構……………………………….………...……17
    1.4.6 氫臨界濃度與補集位置………………………….……...…21
    1.4.7 氫脆與應力腐蝕的比較…….……………………….….…24
    1.4.8氫脆的避免……….…………………………………...……24
    二、 實驗步驟與方法…………………………………………………30
    2.1 材料製作與處理………….………………………………………31
    2.2 電鍍與去氫脆化烘烤………………………………….…………33
    2.3、拉伸試驗與缺口拉伸試驗………………………………………35
    2.4 測氫儀與GDS分析………………………………...…………….36
    2.5 破斷面觀察……………………………………………………….39
    三、結果與討論……………………………………………….……….40
    3.1 測氫儀與GDS檢測氫含量…………………………..….……..….40
    3.2 拉伸試驗…..…..………………..……..…………………......…...44
    3.3 缺口拉伸試驗………………………..……………….…………..48
    3.4光學與SEM破斷面觀察………………………………...….…..….52
    3.4.1 SCM-415滲碳氮化熱處理(編號HT試片)…….……..…..….53
    3.4.2 SCM-415滲碳氮化熱處理後電鍍(銅+銀)(未去氫)(編號HPN試片)………………………………………………………………...60
    3.4.3 SCM-415滲碳氮化熱處理後電鍍(銅+銀)(去氫烘烤6 hrs)(編號HP6試片)……………………………………………………69
    3.4.4 SCM-415滲碳氮化熱處理後電鍍(銅+銀)(去氫烘烤24 hrs)(編號HP24試片)…………………………………………………78
    3.5 裂縫成長模式與氫含量的關係……………………………….…86
    四、結論……………………………………………………………….87
    五、參考文獻………………………………………………………..…88
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    Advisor
  • Shyong Lee(李雄)
  • Files
  • 93333029.pdf
  • disapprove authorization
    Date of Submission 2006-07-12

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