查詢結果分析
來源資料
頁籤選單縮合
| 題 名 | 肥粒鐵基球狀石墨鑄鐵之微觀組織與共振疲勞特性的關係探討=Influence of Microstructure on the Resonant Vibration Fatigue Characteristics of S.G.Cast Iron |
|---|---|
| 作 者 | 林士晴; 呂傅盛; 陳立輝; | 書刊名 | 鑄工 |
| 卷 期 | 23:4=95 1997.12[民86.12] |
| 頁 次 | 頁43-50 |
| 分類號 | 472.2 |
| 關鍵詞 | 共振疲勞; 球墨鑄鐵; 微觀組織; 凝固速率; Resonant vibation fatigue; Spheroidal graphite cast iron; Microstructure; Solidification rate; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 應用於交通器材零件的肥粒鐵基球墨鑄鐵,使用時難免有遭受共振疲勞破壞的狀況。本研 究目的在理解不同凝固速率之鑄鐵材料,因微觀組織細化對共振疲勞特性的影響。實驗結果顯示, 不論試料之凝固速率的快慢,球狀石墨顆粒數增加以及平均粒徑明顯變化,各試料之固有共振頻率 幾乎相同,特別是試料達到共振狀態時,板狀試片末端的偏移量相近。凝固速率較快的試料因球狀 石墨平均粒徑明顯變小,實驗結果顯示共振疲勞斷裂的次數大於凝固速率慢的試料。根據裂紋觀察 結果可知各試料之裂紋生成及成長模式雖然相似,但凝固速率較快的試料因為球墨的粒徑較小而且 較多,可確認裂縫之生成較早而且多處出現。此外由於晶界面積較大,有阻礙裂縫的串聯的效果。 觀察各試料之破壞型態,本報告可確認肥粒鐵基球墨鑄鐵的共振破壞具有特徵,而且不同於其他常 疲勞試驗之破斷特徵。 |
| 英文摘要 | Ferritic spheroidal graphite (S.G.) cast iron has been used in many automobile components. However, during application, resonant fatigue may occur and cause failure. This work examined the influence of microstructure on resonant vibration fatigue characteristics of S.G. cast irons produced in different solidification rates. The microstructures of the two S.G. cast irons used in this work were characterized by spheroidal graphite radius and mean ferritic grain size. The experimental results showed that the resonant vibation frequency of the two materials were almost the same and so did the maximum deflection in resonant vibration. The faster solidification rate specimen was more resistant to resonant vibration failure than the slower rate specimen. Because of the smaller spheroidal graphite radius in faster solidification rate specimen, it made the cracks initiate earlier than the larger spheroidal graphite radius specimen. But the larger grain boundary area of faster solidification rate specimen could retard the crack linking. According to the fracture morphology, this work confirmed that the characteristics of resonant vibration fatigue of ferritic spheroidal graphite cast iron was different from that of general fatigue testing. |
本系統中英文摘要資訊取自各篇刊載內容。