Alloy development and shell mould casting of gamma TiAl
Alloy development and shell mould casting of gamma TiAl
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DOI：
10.1016/s0924-0136(02)00873-7
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发表时间：
2003-04
影响因子：
6.3
通讯作者：
Rui Yang;Y. Cui;Lu Dong;Jia Qing
中科院分区：
文献类型：
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作者：
Rui Yang;Y. Cui;Lu Dong;Jia Qing
本文综述了作者实验室近年来在γ-TiAl基合金性能和壳型铸造方面的研究情况。铸态和热处理的含44.2- 47 at.%的三元合金Al和0-8at.%研究了Nb在900°C下的抗氧化性和在900和15°C之间的循环热疲劳试验期间的裂纹扩展行为。还研究了通过循环热处理的晶粒细化和磨削过程中材料的可加工性。结果表明，含5at. Nb含量表现出最佳的平衡性能。然后制备基于Ti-46.5Al-5 Nb的合金并测量其机械性能。一个模型组件成功地铸造使用氧化锆为基础的壳型。铸件的检查表明，表面污染层的厚度通常小于80μm。
Recent studies of the properties and shell mould casting of gamma TiAl-based alloys in the authors’ laboratory are summarised in this paper. As-cast and heat treated ternary alloys containing 44.2–47at.% Al and 0–8at.% Nb were investigated for oxidation resistance at 900°C and crack propagation behaviour during cyclic thermal fatigue test between 900 and 15°C. Grain refinement through cyclic heat treatment and machinability of the material during grinding were also studied. It was found that alloys with about 5at.% Nb content show the best balanced properties. An alloy based on Ti–46.5Al–5Nb was then prepared and its mechanical properties measured. A model component was successfully cast using a zirconia-based shell mould. Examination of the castings shows that the thickness of the surface contamination layer is typically less than 80μm.