论文部分内容阅读
对氩气雾化法制备的高温合金FGH96粉末进行了热等静压(HIP)处理,分析了粉末粒度和氧含量对HIP态合金组织的影响,研究了FGH96合金组织中PPB的类型、相结构和形成机制。结果表明,氩气雾化FGH96粉末的氧含量较低,平均氧含量约为50×10-6,随着粉末粒度降低,颗粒比表面积增大,促进了粉末氧含量的升高;粉末经HIP处理后氧含量具有遗传特征,原始粉末氧含量越高,HIP态合金氧含量也越高,且平均氧含量增至83×10-6;粉末尺寸和氧含量对合金致密化行为无明显影响,HIP态合金密度约为8.33 g·cm-3。小尺寸粉末制备的HIP态合金原始颗粒边界主要析出ZrO2和MC碳化物,而大尺寸粉末制备的HIP态合金原始颗粒边界主要析出大尺寸花瓣状γ’相和少量MC碳化物。粉末粒度和氧含量影响PPB析出,小尺寸粉末因氧含量高经HIP处理时颗粒边界处存在更多、尺寸更大稳定的ZrO2,ZrO2成为MC碳化物析出形核的核心,促进了大量MC碳化物的析出。
The hot isostatic pressing (HIP) of high temperature alloy FGH96 powder prepared by argon atomization was carried out. The effect of particle size and oxygen content on the microstructure of HIP alloy was analyzed. The type and phase structure of PPB in FGH96 alloy were studied. And formation mechanism. The results show that the oxygen content of argon atomized FGH96 powder is low, the average oxygen content is about 50 × 10-6. With the decrease of the particle size, the specific surface area of the particles increases and the oxygen content of the powder increases. Oxygen content after treatment has the genetic characteristics. The higher the original powder oxygen content, the higher the oxygen content in the HIP state alloy, and the average oxygen content increases to 83 × 10-6. The powder size and the oxygen content have no significant effect on the densification behavior of the alloy, HIP state alloy density of about 8.33 g · cm-3. Large size powder prepared HIP state alloy primary particle boundaries precipitated mainly ZrO2 and MC carbide, while the large size powder prepared HIP state alloy primary particle boundary precipitation of large size petal-shaped γ ’phase and a small amount of MC carbide. Powder size and oxygen content affect the precipitation of PPB. Small size powders have more and larger size ZrO2 and ZrO2 particles at the grain boundary due to the high oxygen content. ZrO2 and ZrO2 become the core of MC carbide precipitation nucleation and promote a large amount of MC carbonization Precipitation of things.