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新型難變形高溫合金эк151的組織特征及平衡析出相熱力學(xué)計(jì)算
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國(guó)家重點(diǎn)基礎(chǔ)研究和發(fā)展計(jì)劃(2010CB631203)


Microstructure Characteristics and Thermodynamic Calculation of Equilibrium Precipitated Phases in a New Difficult-to-Deform Superalloy эк151
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    摘要:

    利用場(chǎng)發(fā)射掃描電子顯微鏡對(duì)其鑄態(tài)組織進(jìn)行了觀察，并通過熱力學(xué)計(jì)算，對(duì)該合金中成分對(duì)平衡相析出的影響規(guī)律進(jìn)行了研究。結(jié)果表明，эк151合金凝固過程中，Mo、Nb和Ti等元素在枝晶間偏析，并形成大量γ′+γ共晶相。合金主要析出相為大量的γ′相、少量的一次、二次碳化物和硼化物以及μ相。其中強(qiáng)化相γ′多成立方狀，800 ℃下平衡態(tài)質(zhì)量分?jǐn)?shù)含量高達(dá)50%左右。當(dāng)成分在規(guī)定范圍波動(dòng)時(shí)，對(duì)熔點(diǎn)影響最大的為Cr、Mo、Nb和Ti；而Al、Ti和Nb含量變化均會(huì)影響到γ′相的析出量及析出溫度；Cr、Mo含量變化還會(huì)影響到二次碳化物的種類，Ti、Nb、C雖然是一次碳化物MC的主要形成元素，但是成分范圍內(nèi)對(duì)其析出溫度影響并不明顯。影響μ相析出溫度和析出量的主要成分為Cr、Mo和W

    Abstract:

    The cast microstructure of a new difficult-to-deform superalloy эк151, was observed by high resolution field emission scanning electron microscope. The effects of elements on the thermodynamic equilibrium phases were studied by Thermo-Calc software. The results show that there is serious segregation of Mo, Nb and Ti during the solidification, which promotes γ′+γ eutectic. The main precipitates of эк151 alloy are a large fraction of cubic γ′, some carbides, borides and μ phase. Higher Cr, Mo, Nb and Ti contents can improve the primary and final melting points. The contents of Al, Ti and Nb can influence the precipitation temperature and mass fraction of γ' phase. Contents of Cr and Mo promote precipitation of M23C6 and M6C respectively. Furthermore, the increment of Cr, Mo and W content leads to more precipitation of μ phase

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畢中南,曲敬龍,杜金輝,張 繼.新型難變形高溫合金эк151的組織特征及平衡析出相熱力學(xué)計(jì)算[J].稀有金屬材料與工程,2013,42(5):919~924.[Bi Zhongnan, Qu Jinglong, Du Jinhui, Zhang Ji. Microstructure Characteristics and Thermodynamic Calculation of Equilibrium Precipitated Phases in a New Difficult-to-Deform Superalloy эк151[J]. Rare Metal Materials and Engineering,2013,42(5):919~924.]
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  • 收稿日期:2012-05-16
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