High Temperature Oxidation Mode and Transformation Mechanism of Quaternary Co-Ni-Cr-Al Alloys
Received date: 2022-04-27
Revised date: 2022-08-16
Online published: 2022-11-17
Supported by
National Natural Science Foundation of China(52171066);National Natural Science Foundation of China(51771034);Natural Science Foundation of Hunan Province(2020JJ4610);Postgraduate Scientific Research Innovation Project of Hunan Province(CX20200871)
The addition of Ni to cobalt-based alloys can form the γ′ phase, which can significantly improve their mechanical properties and high-temperature oxidation resistance. The oxidation behavior of quaternary Co-20Ni-8Cr-xAl (x = 3 or 5, mass fraction, %) alloys was investigated in 1.013 × 105 Pa O2 at 800, 900, 1000, and 1100oC. Also, the effects of Al and/or Cr contents and temperature on the oxidation properties of the alloys were explored by analyzing the oxidation kinetics of the alloys and the cross-sectional morphology characteristics of the scales, revealing the oxidation mechanism of these alloys. After oxidation, both the alloys formed complex scales with irregular thickness and composition. Alumina scales were generated for each alloy at 800, 900, and 1000oC and only for Co-20Ni-8Cr-5Al at 1100oC. The increase in temperature from 800oC to 900oC has a negative effect on the oxidation resistance, resulting in greatly accelerated oxidation rates. Conversely, that from 1000oC to 1100oC has a positive effect on the oxidation of the two alloys, causing a decrease in the oxidation rate. The oxidation rate of the Co-Ni-Cr-Al alloy decreases when the Al content in the alloy is increased from 3% to 5%, but 5% is still not sufficient to form continuous alumina scales. The simultaneous presence of Cr and Al is beneficial to reducing the oxidation rate of the quaternary Co-Ni-Cr-Al alloys compared with the ternary Co-Ni-Al alloy with the same Al content.
LV Yunlei , REN Yanjie , FENG Kangkang , ZHOU Mengni , WANG Wen , CHEN Jian , NIU Yan . High Temperature Oxidation Mode and Transformation Mechanism of Quaternary Co-Ni-Cr-Al Alloys[J]. Acta Metall Sin, 2024 , 60(7) : 947 -956 . DOI: 10.11900/0412.1961.2022.00200
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