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研究了新型镍基高温合金GH4065A在650~750℃的静态氧化行为,基于对氧化动力学与氧化产物的分析,探讨了合金的氧化机制。结果表明:采用平均氧化增重速率指标评定GH4065A合金在650~750℃温度范围内均为完全抗氧化级别,试验条件下合金的抗氧化能力与典型涡轮盘材料FGH96、GH4720Li合金相当;合金的氧化产物主要为内层富铝的氧化物颗粒、外侧富铬的氧化物膜及表面金红石型TiO_2颗粒,TiO_2颗粒在氧化温度超过700℃后开始生成;合金的氧化动力学遵循抛物线型规律,受钛离子与铬离子穿过氧化膜的扩散过程共同控制。
The static oxidation behavior of GH4065A at 650-750 ℃ was studied. Based on the analysis of oxidation kinetics and oxidation products, the oxidation mechanism of the alloy was discussed. The results showed that GH4065A alloy was completely anti-oxidant grade at the temperature range of 650-750 ℃. The oxidation resistance of the alloy was similar to that of the typical turbine disc materials FGH96 and GH4720Li. The oxidation of the alloy The products mainly consist of the inner aluminum-rich oxide particles, the outer chromium-rich oxide films and the surface rutile TiO 2 particles. The TiO 2 particles begin to form after the oxidation temperature exceeds 700 ℃. The oxidation kinetics follows the parabolic law, Ion and chromium ions through the oxide film diffusion process jointly controlled.