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型殼中央散熱對一種單晶高溫合金凝固組織與持久性能的影響
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沈陽黎明航空發(fā)動機(集團)有限責(zé)任公司

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國家自然科學(xué)基金資助（項目號51202008），中國博士后科學(xué)基金（項目號2013M540037）


Effects of Ceramic Shell Mold with Central Heat Radiation on Solidification Microstructures and Stress Ruptre Property of a
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Shenyang Liming Aero-Engine (Group) Corporation Ltd, Shenyang 110043, China

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National Key Basic Research Development Planning (“973” Project) (2010CB731604)

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    摘要:

    單晶凝固過程中溫度場均勻性控制對單晶制備過程特別重要。本文以國內(nèi)廣泛應(yīng)用的第二代單晶高溫合金DD6為研究對象，研究型殼中央散熱對其凝固組織與持久性能的影響。結(jié)果表明，與合金中柱型殼相比，石墨中柱型殼能有效地改善單晶凝固過程中溫度場的均勻性，提高溫度梯度，有利于保持單晶凝固過程中熱流方向的平直。因此，石墨中柱型殼有利于降低一次枝晶間距，細化γ-γ’共晶相，減少單晶生長方向與[001]方向的角度差，使單晶高溫合金獲得較高的持久壽命。

    Abstract:

    The control of the temperature field during single crystal solidification has an important effect on single crystal growth. The present paper studied the influence of ceramic shell mold with central heat radiation on the microstructures and stress rupture property of the widely used DD6 single crystal superalloy. The results indicated that the mold with graphite center pillar could improve the uniformity of the temperature field and the temperature gradient during the solidification, and it could make the direction of heat flow more straight. As a result, the primary dendrite arm spacing decreased, the size and the volume fraction of γ-γ'' eutectic were reduced, the angle between the single crystal growth orientation and the [001] orientation decreased, so the single crystal superalloy can achieve longer stress rupture life.

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樂獻剛.型殼中央散熱對一種單晶高溫合金凝固組織與持久性能的影響[J].稀有金屬材料與工程,2016,45(8):2057~2063.[Yue Xiangang. Effects of Ceramic Shell Mold with Central Heat Radiation on Solidification Microstructures and Stress Ruptre Property of a[J]. Rare Metal Materials and Engineering,2016,45(8):2057~2063.]
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  • 收稿日期:2014-07-08
  • 最后修改日期:2014-08-07
  • 錄用日期:2014-09-28
  • 在線發(fā)布日期: 2016-10-09
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