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Ti/Al比對(duì)鎳基單晶高溫合金組織和持久性能的影響
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遼寧省教育廳高等學(xué)校科學(xué)技術(shù)研究項(xiàng)目（20060639）


Effect of Ti/Al Ratio on the Microstructure and Stress Rupture Property in a Ni-Base Single Crystal Superalloy
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    摘要:

    研究了Al+Ti原子總量相同、Ti/Al比不同的3種單晶高溫合金的微觀組織和持久性能，討論了無(wú)Re單晶高溫合金中Al和Ti元素的成分設(shè)計(jì)原則。利用金相顯微鏡和掃描電鏡對(duì)鑄態(tài)和熱處理態(tài)組織進(jìn)行觀察和分析；利用透射電鏡的EDS對(duì)合金元素在兩相中的分配比和錯(cuò)配度進(jìn)行測(cè)試和分析。結(jié)果表明：隨著Ti/Al比的增加，合金鑄態(tài)枝晶間的g ￠-g共晶含量略有增加；熱處理態(tài)g ￠相尺寸略有降低，g ￠相形貌逐漸規(guī)則，錯(cuò)配度略有降低。Ti/Al比的變化對(duì)合金的相變溫度影響不大。Ti/Al比的變化對(duì)合金元素在兩相中的分配有明顯的影響，高Ti/Al比使合金元素在g ￠和g中的分配比更偏離于1。隨著Ti/Al比的增加，合金的持久壽命逐漸增加。

    Abstract:

    The microstructure and stress rupture properties of three experimental single crystal nickel superalloys with different Ti/Al ratios were investigated. The microstructure as-cast state and after heat treatment was analyzed by OPM and SEM. Partition ratio of alloy element in two phase and misfit degree were measured and analyzed by TEM with EDS. The results show that with increasing of Ti/Al ratio, the amount of g-g ￠ eutectic in interdendrtic region as-cast state increases slightly, the size of g ￠ phase in heat treated state decreases a little and the morphology turns regular and the misfit decreases. The change of Ti/Al ratio has no obvious effect on the transformation temperatures. The stress rupture life is improved gradually with increasing of Ti/Al ratio.

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劉麗榮,金 濤,陳海軍,孫曉峰,管恒榮,胡壯麒. Ti/Al比對(duì)鎳基單晶高溫合金組織和持久性能的影響[J].稀有金屬材料與工程,2009,38(4):612~616.[Liu Lirong, Jin Tao, Chen Haijun, Sun Xiaofeng, Guan Hengrong, Hu Zhuangqi. Effect of Ti/Al Ratio on the Microstructure and Stress Rupture Property in a Ni-Base Single Crystal Superalloy[J]. Rare Metal Materials and Engineering,2009,38(4):612~616.]
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  • 收稿日期:2008-03-27
  • 最后修改日期:2009-01-22
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