Long-term isothermal oxidation behavior of two industrial polycrystalline nickel base alloys in air at 700 °C – Evaluation of intergranular oxidation distribution and kinetic
Long-term isothermal oxidation behavior of two industrial polycrystalline nickel base alloys in air at 700 °C – Evaluation of intergranular oxidation distribution and kinetic
复制标题
两种工业多晶镍基合金在 700 °C 空气中的长期等温氧化行为 – 晶间氧化分布和动力学评估
DOI：
10.1016/j.corsci.2021.109500
复制
发表时间：
2021
影响因子：
8.3
通讯作者：
S. Knittel
中科院分区：
文献类型：
--
作者：
R. Malacarne;S. Mathieu;L. Aranda;M. Vilasi;C. Desgranges;S. Knittel
形成氧化铬的合金718和AD730™已在700 °C下进行了长达10000小时的等温长期空气暴露。由此产生的非常低的比增重导致考虑两种替代方案来确定氧化动力学。在SEM显微照片上进行了外层厚度和晶间氧化物量的测量，证明晶间氧化对总比质量变化的贡献约为30%。具有更厚的外部氧化皮和更高量的晶间氧化物的AD730™显示出比Alloy 718快两倍的氧化速率。结果表明，需要更长的测试。
Chromia forming Alloy 718 and AD730™ have been submitted to isothermal long-term air exposure up to 10 000 h at 700 °C. The resulting very low specific mass gain led to consider two alternatives to determine the oxidation kinetics. Measurements of the external layer thickness and of the intergranular oxide amount were carried out on SEM micrographs evidencing the intergranular oxidation contribute around 30% to the total specific mass change. AD730™ with a thicker external scale and a higher amount of intergranular oxide showed a twofold faster oxidation rate than Alloy718. The results demonstrated the need of even longer tests.