Oxidation Behavior of a Cast Polycrystalline Ni-Base Superalloy in Air: At 900 and 1000 °C
Oxidation Behavior of a Cast Polycrystalline Ni-Base Superalloy in Air: At 900 and 1000 °C
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DOI：
10.1007/s11085-007-9066-x
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发表时间：
2007-07
影响因子：
2.2
通讯作者：
Hua Wei;G. Hou;X. Sun;H. Guan;Zushu Hu
中科院分区：
文献类型：
--
作者：
Hua Wei;G. Hou;X. Sun;H. Guan;Zushu Hu
研究了一种铸造多晶镍基高温合金在900和1000 °C下的氧化行为，并通过热重分析（TGA）、X射线衍射（XRD）和扫描电镜（SEM）对其进行了分析。结果表明，铸造镍基高温合金的氧化动力学为亚抛物线型，氧化动力学受内层富铝层的生长控制。合金经长期氧化后形成混合氧化膜。γ基体上形成的氧化膜由外层尖晶石和内层均匀致密的富铝层组成。MC碳化物析出相上的氧化行为与γ基体中的氧化行为略有不同。这种差异是由于MC碳化物与γ基体的成分差别较大所致。
The oxidation behavior of a cast polycrystalline Ni-base superalloy was studied at 900 and 1000 °C and analyzed by thermogravimetric analysis (TGA), X-ray diffraction (XRD) and SEM. The results indicate that the cast Ni-base superalloy exhibits subparabolic oxidation kinetics, which are controlled by the growth of the inner Al-rich layer. A mixed scale forms on the alloy after prolonged oxidation. The oxide scale formed on the γ matrix is composed of an outer layer of spinel and a uniform inner, compact Al-rich layer. The oxidation behavior on the region overlying MC carbide precipitates is slightly different from that in the γ matrix. The difference is explained by the big difference in composition between MC carbide and γ matrix.