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題 名 | 牛眼組織基地的石墨鑄鐵之微觀破壞行為=Microfracture Behaviors of Nodular Iron with Bull-Eyed Structure |
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作 者 | 劉明宗; 張順太; | 書刊名 | 材料科學 |
卷 期 | 28:2 1996.06[民85.06] |
頁 次 | 頁136-146 |
分類號 | 440.363 |
關鍵詞 | 牛眼組織; 微觀破壞; 鈍化作用; 晶界; 界面; Bull-eyed structure; Microfracture; Blunting; Grain boundary; Interface; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究係以FCD 400品級(JIS G5502)之球墨鑄鐵為基材,經熱處理得含 25-60體積百分率肥粒鐵之牛眼組織基地。以迷你抗拉試片在掃描電子顯微鏡中 進行拉伸,由臨場(in-situ)觀察及分析其微觀破壞之過程,並提出破壞機構之模式。 由實驗結果顯示,牛眼基地之球墨鑄鐵之微觀破壞可分為石墨與基地分離,微裂 縫衍生,微裂縫之成長與併合,主裂縫的形成及其傳播至破壞等五個階段。此一 機構不因肥粒鐵與波來鐵相對含量而有所不同。 荷重初期微裂縫衍生多偏好於肥粒鐵三晶粒之界點及球墨週緣,而在後期則蔓延 至波來鐵區域內。裂縫進行中,肥粒鐵晶界面及肥粒鐵與波來鐵界面,均對其產 生阻擋作用,尤其在裂縫抵達上述界面時,益形顯著。本文亦對不同肥粒鐵含量 的牛眼組織球墨鑄鐵受拉力負荷的玻壞型態,加以檢討。 |
英文摘要 | Nodular iron with bull-eyed sturcture was systematically prepared and the microfracturemechanism was studied in-situ under a scanning microscope by using an increamentally loadedmini-tensile coupon. A fracture mechanism was proposed that there were five distinct steps inmicrofracturing process: (1) decohesion between graphite nodules and maitrix; (2) microcrackinitiation; (3) microcrack growth and coalescence; (4) dominant crack formation; and then(5) the final stage appeared as the accelerating propagation to fracture of the dominant cracks. These phenomena could be found simultaneously at different locations, regardless of the ferrite/pearlite ratio in the structure. It was found that the favorable sites for crack initiation being located at the triple point offerrite grains and around the decohered graphite nodules. Microcracks inside the pearlite blockcan only be observed at the very final stage of loading. The ferrite grain boundary and ferrite/pearlite interface hindered the cracks to advance was also noted. This effect was particularlypronounced as cracks approaching these regions. Fractographs indicated a mixed fracture mode of tearing and quasi-cleavage, in accordance with the phase proportion of (he constituents. |
本系統中英文摘要資訊取自各篇刊載內容。