Long-term isothermal oxidation behavior of two industrial polycrystalline nickel base alloys in air at 700 °C-Evaluation of intergranular oxidation distribution and kinetic

作     者：Malacarne, R. Mathieu, S. Aranda, L. Vilasi, M. Desgranges, C. Knittel, S. 

作者机构：Univ Lorraine CNRS IJL F-54000 Nancy France Safran Tech Rue Jeunes BoisCS 80112 F-78772 Magny Les Harneaux France Safran Aircraft Engines Rue Henri Auguste Desbrueres F-91000 Evry France 

出 版 物：《CORROSION SCIENCE》 (腐蚀科学)

年 卷 期：2021年第188卷

页      面：109500-109500页

核心收录：

学科分类：080503[工学-材料加工工程] 0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Safran Group 

主　　题：A Superalloys C High-temperature oxidation C Grain boundaries oxidation 

摘      要：Chromia forming Alloy 718 and AD730TM have been submitted to isothermal long-term air exposure up to 10 000 h at 700 degrees 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. AD730TM 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.