臺灣博碩士論文加值系統

　　本研究藉由兩種來源之SUPER304H不銹鋼管，經700 ℃，0小時 ~ 700小時共6種不同持溫時間敏化熱處理後，分別觀察試片顯微組織、破斷區域，試驗其敏化程度、硬度狀況、抗拉強度、伸長率以及抗潛變性能，透過Larson-Miller關係式，計算出敏化影響試片潛變壽命之程度。
　　實驗結果顯示，不論敏化程度為何，經潛變試驗後之試片幾乎皆呈現溝渠式結構，導致試片破斷樣式呈脆性破斷。未經敏化熱處理樣品敏化程度極低，有敏化熱處理之敏化程度相對較高。試片之硬度值幾乎與敏化程度無關連，但是伸長率則有下降趨勢。潛變壽命在試片承受低應力狀態下受敏化程度影響程度相當顯著，在高應力狀態下相對較低。

　　In this study, SUPER304H stainless steel tubes from two sources are sensitized at 700 ℃ in 6 various exposure durations from 0 to 700 hours.
Microstructure analysis, fracture surface investigation, hardness and mechanical properties tests are performed. Moreover, the effect of sensitization on the high temperature creep resistance of the steels is explored based on the Larson-Miller relationship.
　　The experimental results show that ditch structure observed from the samples after creep test, which leads to brittle fracture. Samples without heat treatment have light sensitization effect. However, severe for the samples with heat treatment. Hardness almost has nothing to do with sensitization, but elongation decrease. Sensitization has great influence on the creep life while under low stress condition. By contrast, in higher stress environment, sensitization has little on the creep life.

第一章　前言 5
第二章　文獻回顧 6
2.1　超臨界發電鍋爐材料演進歷程 6
2.2　先進超臨界不銹鋼材料特性 13
2.2.1　物理性質 13
2.2.2　組成成分 15
2.2.3　敏化 16
2.2.4　蒸汽側氧化 17
2.2.5　火側腐蝕 19
2.2.6　晶粒尺度 21
2.2.7　機械性質 21
2.2.8　金相組織與析出相 24
2.3　潛變壽命評估理論 30
2.3.1　潛變曲線 30
2.3.2　潛變壽命評估方法 33
2.4 超臨界發電鍋爐材料使用經驗 34
第三章　試驗流程與方法 37
3.1　試驗材料與流程 37
3.2　熱處理流程 41
3.3　顯微組織觀察 42
3.4　硬度試驗 44
3.5　敏化試驗 45
3.6　缺口型拉伸試驗 46
3.7　單軸式潛變試驗 48
3.8　掃描式電子顯微鏡觀察 49
第四章　結果與討論 50
4.1　顯微組織 50
4.2　硬度試驗 59
4.3　缺口型拉伸試驗 61
4.4　敏化試驗 65
4.5　單軸式潛變試驗 67
第五章　結論 79
參考文獻 81
附錄、實驗結果照片 87

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