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|標題:||Effect of titanium contents on the microstructure and wear behavior of Fe-based hardfacing alloy
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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。
|Appears in Collections:||材料科學與工程學系|
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