研究生: |
林國慶 Kuo-ching Lin |
---|---|
論文名稱: |
臨場合成多元合金顯微結構與磨耗行為研究 A Study of Microstructure and Wear Performance on in-situ synthesis Multicomponent Alloy |
指導教授: |
林原慶
Yuan-Ching Lin |
口試委員: |
向四海
Su - Hai Hsiang 蘇侃 HON SO |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 機械工程系 Department of Mechanical Engineering |
論文出版年: | 2006 |
畢業學年度: | 94 |
語文別: | 中文 |
論文頁數: | 146 |
中文關鍵詞: | 氬銲 、多元合金 、磨耗 |
外文關鍵詞: | clad, coating, multicomponent |
相關次數: | 點閱:193 下載:3 |
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摘要
本文為添加多種不同的金屬元素,於中碳鋼表面進行氬銲被覆之研究。主要目的在探討金屬元素的數量與不同的組合方式對被覆層之硬度提升、相結構的變化及耐磨耗能力的影響,並找出影響耐磨耗能力之主要關鍵。
研究結果顯示,添加Ti元素的被覆層內,有臨場合成(in-situ)TiC的現象發生,雪花狀結構TiC的析出,屬於析出強化;若再多添加W元素,則會有(Tix ,Wy)Cz的固溶體的出現,為固溶強化機構。而在不含Ti的五元合金被覆層內,會產生等軸晶與柱狀晶結構,此時硬度為所有被覆層當中最高值;在不添加Al的七元合金被覆層內,硬度明顯低於其他被覆層,約為Hv380。
在磨耗試驗結果當中發現,多元合金被覆層雖有高硬度,但在乾磨耗條件下,因為高溫使得結構產生臨場相轉換(in-situ phase transformation)的現象,因此比AISI 1050 基材不耐磨,但在潤滑磨耗條件下,潤滑劑的熱傳導效應,將摩擦表面(rubbing surface)的溫度降低,使其不會達到相轉換溫度,所以在多元合金被覆層的高硬度特性下,有極佳的耐磨耗能力,磨耗量是遠低於AISI 1050 基材。
Abstract
The study of this paper deals with that adding many kinds of different metallic elements cladded on surface of medium carbon steel. The major objective of this thesis is to study the influence of the numbers of metallic elements and different modes of combination effect on cladded surface hardness, microstructure and wear resistance ability. Meanwhile, find the key point about its influencing wear mechanism in the coatings.
According to the results of this study, the types of structure belong to precipitation strengthening because there is a phenomenon of flower-like TiC precipitated in coatings of adding Ti element. If it increases more W element, it will induce (Tix ,Wy)Cz solid solution in coatings belong to solid solution strengthening. There are equiaxed and columnar structure in the 5-component coating without adding Ti element, then indicate maximum hardness in all coatings. The 7-component coating without adding Al element show minimum hardness Hv380.
Under dry wear test, multicomponent coatings have higher hardness, but it’s lower wear-resistance ability than AISI 1050 substrate since in-situ phase transformation happened on high temperature situation. However, under wet wear test can decrease temperature on rubbing surface result from heat transformation phenomenon, the harder multicomponent coatings can’t reach phase transformation temperature. Therefore, it has significantly the wear-restant ability, and the wear loss is lower than AISI 1050 substrate.
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