沃斯回火球墨鑄鐵之沖蝕磨耗行為研究

Study on Erosion Behavior of Ductile Iron After Austempering Heat Treatment

施作融(Tso-Jung Shih 施作融)

指導教授 ： 唐自標

國立臺北科技大學/工程學院/材料及資源工程系研究所/碩士(2011年)

摘要

本研究係以球墨鑄鐵進行沃斯回火熱處理，獲得不同基地組織的試片，再利用沖蝕磨耗實驗來進行各種角度的沖蝕磨耗，配合硬度測試及掃描式電子顯微鏡(SEM)來觀察沖蝕表面，探討沃斯回火熱處理對球墨鑄鐵，不同沖蝕磨耗型態與衝擊角度的影響。
實驗結果顯示，材料經ADI熱處理後，硬度均會增加，抵抗沖蝕的能力亦隨之提高。經由SEM觀察在石墨處產生了凹穴，由於石墨的抵抗沖蝕磨耗性較差，在這些凹穴四周圍由於基地組織與石墨組織的快速變形，加速材料的剝落。然基地組織硬度的提升，有助石墨組織抵抗沖蝕磨耗能力，減小石墨組織脫落、塌陷的情況。

關鍵字

沃斯回火 ； 球墨鑄鐵 ； 沖蝕磨耗

並列摘要

This research applied austempering heat treatment to obtain various microstructures in the matrix of ductile iron and studied their erosion wear behavior. The effects of different impact angle and microstructure on erosion wear rate and morphology were investigated. Hardness test evaluation together with SEM analysis were also carried out to correlate the wear behavior observed.
The results showed that after austempering hardness increased substantially. From the results of erosion wear test on ADI, it is found test the ability for erosion resistance of ADI is improved. Due to poor impact wear resistance of the graphite, they fell off from the matrix in early stage of the shot blasting leaving a hole behind that acclerated the peeling off effect of the ductile iron. Higher hardness enhanced eorsion wear resistance from the ability of sustaining deformation and peeling off effects.

並列關鍵字

Austempering ； Ductile iron ； Erosive Wear

參考文獻

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