测定了DZ40M钴基合金在900-1100℃空气中的氧化动力学曲线，观察分析了各温度下经不同时间氧化后合金的表面氧化物形貌和组成。该合金在900和1100℃的静态氧化较好地符合抛物线规律，而在1050和1100℃时由于氧化皮严重开裂和剥落而近乎呈直线发展。两者的氧化层形成机制有所不同，900和1000℃的后期氧化产物以Cr2O3为主，形成连续致密的保护层；1050的1100℃的后期氧化产物以CoCr2O4为主，不形成完整的Cr2O3保护层。
The oxidation kinetics of Co-based superalloy DZ40M in air at 900-1100℃ has been determined,and the oxide compositions at different exposure temperatures for various times have been examined by XRD.The kinetics indicated that this alloy followed the parabolic law at 900 and 1000℃ during isothermal oxidation,and followed the nearly linear law at 1050 and 1100℃ due to serious cracking and spalling-off of the oxide scales.The kinetic behavior of the alloy at all exposure tempweatures was affected greatly by the configuration of Cr2O3 in outer oxide scale.The formation mechanism of oxide scale at 900and 1000℃ deffered from that at 1050 and 1100℃,with the former having a continuous Cr2O3 layer.
参考文献
| [1] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%