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題 名 | 氫環境中AISI 4130合金鋼受超載作用之破壞壽命=Effects of Overloads on Fracture Lifetime of AISI 4130 Alloy Steel in a Hydrogen Bearing Environment |
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作 者 | 宋佩瑄; 張力; 嚴上和; | 書刊名 | 力學 |
卷 期 | 17:2 2001.12[民90.12] |
頁 次 | 頁163-172 |
分類號 | 440.2 |
關鍵詞 | 殘留壓應力; 裂縫閉合; 差排防護; Residual compressive stresses; Crack closure; Dislocation shielding; |
語 文 | 中文(Chinese) |
中文摘要 | 在腐蝕環境中,因構件常受到超載作用,故對各種超載狀況下,構件裂縫之潛伏、成長及破壞壽命行為之研究頗為重要。本文旨在探討AISI 4130合金鋼於連續充氫環境下於不同超載時期受不同超載大小,對其破壞壽命之影響。其中超載時期為0.5,1.0及1.5小時,而超載大小係採超載比1.4、2.0等兩種。文中除研究殘留壓應力、裂縫閉合、差排防護和材料本身損壞等四種機制對氫致破壞之影響外,並由破斷面觀察不同超載狀況下,氫原子在材料內部作用情形及破壞型態之差異。實驗結果發現,在超載時期0.5小時,超載大小2.0倍時,其遲滯效果最佳,破壞壽命約為未施加超載試片之55.6倍。 |
英文摘要 | Service components experience overloads in a corrosive environment very often; therefore, the overload related propagation effects such as crack initiations, crack developments, and the accompanying fracture lives behavior have evolved into an important subject. This work investigated the fracture lifetime of AISI 4130 Alloy steel which encountered overloads when continuously exposed to a corrosive environment. The overloading occurred at the time of 0.5, 1.0, 1.5 hour after the exposure started, and the overload ratio was 1.4 or 2.0, respectively. Attempts were made to identify how the residual compressive stresses, crack closure, dislocation shielding, and physical damages interacted to affect the hydrogen damage. Fracture appearances served to recognize the overload-corrosion effects on hydrogen entry and the follow-up internal material damages. At the overloading time of 0.5hour and the overload ratio of 2.0, crack growth retardation behaved to its maximum in the steel specimen. The resulting fracture lifetime was approximately 55.6 times greater than that under the overload free condition. |
本系統中英文摘要資訊取自各篇刊載內容。