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Re、Ta對第二代定向柱晶合金中初生碳化物形成與分解的影響
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Effect of Re and Ta Addition on the Formation and Decomposition of Primary Carbides in a 2nd Generation DS Superalloy
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    摘要:

    采用差熱分析（DSC），掃描電鏡（SEM），能譜分析（EDS）及X射線衍射（XRD）技術對不同Re、Ta含量的3種合金中MC碳化物的形成與分解進行了研究。結果表明，3種合金的骨架狀MC為共晶反應生成，Ta的加入縮小MC中W的含量及不同凝固階段生成的MC中W含量的差別，促進骨架狀MC形成，提高MC形成溫度并大幅提高MC的熱穩(wěn)定性。Re不進入MC碳化物，Re的加入可降低MC形成溫度并促進μ相從MC周圍過飽和的γ基體中析出，進而誘發(fā)MC不穩(wěn)定分解。

    Abstract:

    The formation and decomposition of MC carbides in alloys with different contents of Re and Ta were investigated by DSC, SEM, EDS and XRD. The results show that script MC carbides in three alloys was formed by eutectic solidification. The addition of Ta not only decreased the W concentration but also minimized the difference of W composition in MC carbides formed at difference freezing period in three alloys. Meanwhile, the addition of Ta also increased the formation temperature and the thermal stability of MC phase significantly. Re was not found in MC carbides. The addition of Re slightly decreased the formation temperature of MC carbides and promoted the precipitation of μ phase from the oversaturated γ matrix.

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趙 坦,張 健,陳 光,樓瑯洪. Re、Ta對第二代定向柱晶合金中初生碳化物形成與分解的影響[J].稀有金屬材料與工程,2009,38(6):1038~1042.[Zhao Tan, Zhang Jian, Chen Guang, Lou Langhong. Effect of Re and Ta Addition on the Formation and Decomposition of Primary Carbides in a 2nd Generation DS Superalloy[J]. Rare Metal Materials and Engineering,2009,38(6):1038~1042.]
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  • 收稿日期:2008-06-26
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