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    沃斯回火處理對含1%Cu球墨鑄鐵硬度及磨耗性質之影響

    發佈:2020/08/31 09:12:17

    摘 要
    本研究主要目的是針對添加1wt%的銅(Cu)元素之球墨鑄鐵,進行不同沃斯回火條件(300℃-1hr、300℃-5hr、300℃-10hr、360℃-1hr、360℃-5hr、360℃-10hr)熱處理,使成為各種沃斯回火延性鑄鐵(ADI)材料,然後進一步探討鑄態與ADI之微觀組織、硬度及磨耗行為的差異,用以了解不同沃斯回火條件對球墨鑄鐵硬度及耐磨耗性質之影響。
    實驗結果顯示:較低沃斯回火溫度(300℃)時,因過冷度大而產生緻密的針狀肥粒體,且殘留沃斯田體含量較少、殘留沃斯田體之碳含量較高,其硬度及耐磨性質較沃斯回火溫度高(360℃)者佳。隨沃斯回火時間增長,殘留沃斯田體含量下降,使其硬度及耐磨性質提升。此外,可以發現ADI硬度及耐磨性質皆比鑄態為優,其中300℃-10hr處理條件之ADI表現最佳。
    關鍵詞:銅元素、沃斯回火延性鑄鐵、殘留沃斯田體、硬度、耐磨性
    ABSTRACT
    The purpose of this study mainly adopted ductile iron containing 1wt%Cu as experimental material to carry out the different austempering conditions (300℃-1hr, 300℃-5hr 300℃-10hr, 360℃-1hr, 360℃-5hr, and 360℃-10hr) for obtaining various austempered ductile irons (ADI). And then it explored the difference in microstructure, hardness, and wear behavior of as-cast and these ADIs. The experimental results showed when compared with 360℃-ADIs, the structure of 300℃-ADIs had a dense needle-like ausferrite, low retained austenite amount, and a high carbon content in retained austenite due to with high cool rate. As the austempering time increases, the retained austenite content decreases. Such the result increases the hardness and wear resistance.

     


    In addition, it can be found that the hardness and wear resistance of ADI are superior to the as-cast specimen, where ADI treated with 300℃-10hr possesses the best performance of hardness and wear resistance.
    Keywords: Cu element, Austempered ductile iron, Retained austenite, Hardness, Wear resistance

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