頁籤選單縮合
題名 | Using Electromagnetic Discharge Imaging Technique to Determine the Hydrogen Contents in Metals=應用電磁放電成像技術檢測金屬含氫量之研究 |
---|---|
作者姓名(中文) | 吳翼貽; 余啟瑞; | 書刊名 | 中國機械工程學刊 |
卷期 | 20:6 1999.12[民88.12] |
頁次 | 頁585-595 |
分類號 | 440.12 |
關鍵詞 | 電磁放電成像技術; 金屬含氫量; 非破壞性檢測; EDI; Discharge intensity; Surface property; Hydrogen content; Hydrogen-affected zone; Mean gray level value; |
語文 | 英文(English) |
中文摘要 | 本研究旨在探討電磁放電成像技術(EDI)應用於金屬含氫量之非破壞性檢測評估能力。其原理為當金屬性質發生變異時,將引起EDI氣體放電強度之改變,應用影像處理技術將實驗結果予以量化,將可用來評估及檢測金屬內部之含氫量變化。實驗結果顯示,EDI放電強度可做為金屬內部含氫量之量測指標。增加金屬含氫量將改變電極間隙氣體及金屬表面之特性,導致EDI放電強度增加。由於含氫量增加所引起之電阻增加,會導致EDI放電強度減低。鋁合金之EDI放電強度與含氫量間呈現線性正比關係;而碳鋼則由於組織結構影響,EDI放電強度與含氫量之對應曲線中呈現二種不同比例常數,惟碳鋼之氫影響區面積與氫含量間則祗呈單一線性比例關係。基於上述實驗結果,藉由影像分析技術之輔助,電磁放電成像技術可用來從事金屬內部含氫量之非破壞性檢測評估工作。更可據以發展出一種可攜式儀器,用來進行金屬含氫量之現場非破壞量測工作。 |
英文摘要 | The Electromagnetic Discharge Imaging (EDI) technique is incorporated with image analysis methods and used as a nondestructive method to determine the hydrogen contents in metals. Various amounts of hydrogen were introduced physically into specimens made of JIS S45C carbon steel and AAllOO aluminum, which have identical surface and geometrical conditions. The experimental results show that the EDI discharge intensity can be used as an index to measure the hydrogen contents in metals. Increasing the hydrogen content in a metal will change the characteristics of the air gap between electrodes and the surface properties of the metals, resulting in an increase of the EDI discharge intensity. The increase of electrical resistivity caused by the increase of the hydrogen content in the specimen decreases the EDI discharge intensity. A linear relationship between the EDI discharge intensity and the hydrogen content in aluminum specimens is observed. The interaction between the beneficial and the adverse effects to the EDI discharge intensity caused by hydrogen atoms is much more significant for steel specimens than for aluminum specimens. The plot of the EDI discharge intensity as a function of hydrogen content comprises two straight lines of different slops. Further analysis show that a linear relationship between the hydrogenaffected zone and the hydrogen content in steel specimen can be obtained. These results indicate that the EDI technique can be used to determine the hydrogen content in metals through the analysis of EDI discharge images. Therefore, a portable instrument can be developed to measure the hydrogen content in metals nondestructively. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。