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題名 | 以PTA被覆Stellite 6合金於球墨鑄鐵:被覆層之微觀組織變化與磨耗特性探討=Microstructural Feature and Wear Characteristics of PTA-Melted Stellite 6 Alloy on Spheroidal Graphite Cast Iron |
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作 者 | 林宏茂; 呂傳盛; 陳立輝; | 書刊名 | 鑄造工程學刊 |
卷期 | 33:1=132 2007.03[民96.03] |
頁次 | 頁1-12 |
分類號 | 472.2 |
關鍵詞 | 轉移式電漿電弧; 被覆電流; 球墨鑄鐵; 磨耗; Stellite 6合金; Plasma transferred arc; Overlaying current; Spheroidal graphite cast iron; Wear; Stellite 6 alloy; |
語文 | 中文(Chinese) |
中文摘要 | 本研究以電漿轉移電弧(PTA)被覆法在固定被覆速度及擺動速度,改變被覆電流(140A~170A)的被覆條件下,將Stellite 6合金被覆在35wt%碳的球墨鑄鐵表面,以探討Stellite 6合金以不同被覆電流被覆於球墨鑄鐵後,對被覆層及界面區域凝固組織影響。此外,實驗中利用Stellite 6合金的被覆層進行切削式磨耗試驗,並探討被覆電流的變化對被覆層硬度、碳化物體積率及切削式磨耗特性的影響。低被覆電流(I=140A)被覆在35wt%碳的球墨鑄鐵表面之Stellite 6被覆層為樹枝狀晶組織,樹枝狀晶間含M7C3及M23C6碳化物,而高被覆電流(170A)被覆時,被覆層為一樹枝狀晶組織。Stellite 6合金被覆層的硬度隨被覆電流的增加而增加,而碳化物體積率亦隨被覆電流增加而增加,主要是因為被覆層遭基材稀釋所致。切削式磨耗實驗結果顯示Stellite 6合金被覆層刀腹磨耗量有隨滑動距離及切削速度增加而增加的趨勢。Stellite 6合金被覆層的刀腹磨耗量隨被覆電流、硬度值及碳化物體積率的增加而降低。切削式磨耗實驗中,被覆層的磨耗機構主要為塑性溝槽、表面拋光及黏附於被覆層的黏著磨耗,而其他的磨耗機構包括脆性裂紋與脆斷。 |
英文摘要 | In this study, Stellite 6 alloy was respectively melted on spheroidal graphite(SG) cast irons with 3.5wt% carbon by plasma transferred arc (PTA) process in the fixed overlaying speed and travel speed by changing overlaying current (140~170A). To explore its influence on the solidification structure of the overlayer and the interface region. In the study, we also used the overlayer with the Stellite 6 superalloy for the cutting wear test to explore the effects of different overlaying current on the microhardness, the amount of carbides and the cutting wear characteristics of the overlayer. The results reveal that the Stellite 6 overlayer melted on SG cast iron with 3.5wt% carbon under low overlaying current (I=140A) is a dendritic structure with M7C3 and M23C6 carbides. When melted under high overlaying current (I=170A), the observation of metallography reveals that the Stellite 6 overlayer is dentritic morphology. The microhardness of Stellite 6 alloy overlayer increases with overlaying current and so does the amount of carbides. The results indicate that the overlayers have been highly diluted by substrate. Hence, the results of cutting wear test reveal that the flank wear width of Stellite 6 overlayer reduces as overlaying current, microhardness and the volume fraction of carbides increase. In the cutting wear test, the wear mechanisms of overlayers are mainly plastic groove, surface polish and adhesive wear as adhered to overlayers. Others minor mechanicsms include brittle crack and fracture. Among these, the case to plastic groove includes microcutting and plough. |
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