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標題: Effect of titanium contents on the microstructure and wear behavior of Fe-based hardfacing alloy
作者: 劉益嘉
Liu, Yi-Chia
關鍵字: Fe-based hard-facing alloy;鐵基硬面合金;Microstructure;Abrasive wear;顯微組織;乾砂磨耗
出版社: 材料科學與工程學系所
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This research discussed the effect of Ti content on the microstructure and wear behavior of Fe-based hard-facing alloys. A series of Fe-Cr-C-Si-Mn-xTi alloy fillers were deposited on SS400 low carbon steel by gas tungsten arc welding (GTAW). Optical microscope, electron microscope and X-ray diffraction were used to investigate the microstructural characteristics. Wear resistance was estimated with sand wheel wear test, and the worn surfaces were observed by scanning electron microscope.
The microstructure of Fe-based hard-facing alloy without of Ti content consisted of primary γ, eutectic [γ+(Fe,Cr)3C], eutectic [γ+(Fe,Cr)2C], and a few martensite. As the Ti content of the hard-facing alloy increased, the microstructure were composed of primary TiC carbide, γ phase, and eutectic [γ+(Fe,Cr,Ti)3C]. The amount and size of the TiC carbide in microstructure was a proportion to the Ti content in Fe-based hard-facing alloy. Nevertheless, the amount eutectic [γ+(Fe,Cr,Ti)3C] will decrease, as the Ti content increased.
According to the results of hardness test and sand wheel test, the lowest hardness (HRC54.93) and the highest wear loss (0.288g) were obtained as the hard-facing alloy has no Ti content. The highest hardness of HRC60.29 and the lowest weight loss of 0.041g were produced, as Ti addition was 4.87 wt%.
The characteristics of worn surface showed that the wear mechanisms in the microstructure of primary austenite and small size TiC carbide were ploughing, micro-void, and fracturing of carbides. Finally, in the microstructure of big size TiC carbide, the wear mechanism was discontinuous ploughing.

本研究探討添加不同鈦含量對鐵基硬面合金顯微組織與磨耗行為之影響,利用鎢極惰性氣體遮護電弧銲接法(Gas Tungsten Arc Welding, GTAW),將預先配製的Fe-Cr-C-Si-Mn-xTi合金填料(x=0.00~7.25 wt%),銲覆於SS400低碳鋼基材表面上。銲覆層之顯微結構藉由光學顯微鏡、電子顯微鏡及X-ray繞射分析進行探討,最後利用乾砂磨耗試驗分析其耐磨耗性質,並以掃瞄式電子顯微鏡(SEM)觀察磨耗面探討其磨耗行為。
本研究在合金填料中添加六組不同配比之鈦金屬,經GTAW銲覆後,無添加鈦金屬組別顯微組織主要由沃斯田鐵相、少量麻田散鐵相、沃斯田鐵與(Fe,Cr)3C及沃斯田鐵與(Fe,Cr)2C之共晶組織所構成。隨鈦金屬添加量增加,顯微組織則由初晶TiC碳化物、沃斯田鐵相、沃斯田鐵與(Fe,Cr,Ti)3C共晶組織所組成。隨鈦含量增加銲覆層中之TiC碳化物數量與尺寸會增加,而沃斯田鐵與(Fe,Cr)3C共晶組織則會減少,並發現銲覆層之硬度與抗磨耗性隨TiC碳化物數量增多而呈上升趨勢。硬度測試與乾砂磨耗試驗之結果顯示,無添加鈦金屬之銲覆層抗磨耗性最差其硬度值為HRC54.93,磨耗量為0.288g,隨鈦含量之增加,銲覆層之抗磨耗性質有上升的趨勢,當銲覆層鈦含量增加至4.87 wt%時,可得最高硬度值HRC60.29,其磨耗量下降至0.041g,抗磨耗性最佳。
其他識別: U0005-1808201111063800
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