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研究激光立体成形GH4169高温合金固溶处理后的组织,分析了固溶过程中合金元素的均匀化,并对材料显微硬度的变化做了讨论。结果表明,随固溶温度的升高,材料的晶界越来越清晰,经1000-1170°C固溶处理1h后材料发生再结晶,当固溶处理温度高于1100°C,有大量孪晶出现,晶粒相比沉积态显著细化,晶粒尺寸约200μm。合金元素的均匀化在1100°C保温1h后基本完成。显微硬度测试结果显示,材料的显微硬度值随固溶温度的升高而降低,在固溶温度低于1100°C时减小趋势较快,高于1100°C时减小趋势减缓。显微硬度的变化与材料中γ′和γ"相及δ相的形态和数量有关。1100°C是激光立体成形GH4169合金比较合适的固溶处理温度下限。
The microstructure of laser solid GH4169 superalloy after solution treatment was studied. The homogenization of alloying elements during the solid solution process was analyzed. The variation of microhardness of the alloy was also discussed. The results show that with the increase of solution temperature, the grain boundary of the material becomes clearer and clear. The material recrystallizes after solution treatment at 1000-1170 ° C for 1h. When the solution treatment temperature is higher than 1100 ° C, Crystals appear, and grains are significantly refined compared to the as-deposited state, with a grain size of about 200 μm. The homogenization of the alloying elements is basically completed after holding at 1100 ° C for 1h. The results of microhardness test show that the microhardness value of the material decreases with the increasing of the solution temperature, decreases rapidly when the solution temperature is lower than 1100 ° C, and decreases when the temperature is higher than 1100 ° C. The variation of microhardness is related to the shape and amount of γ ’, γ’ ’and δ phase in the material, and 1100 ° C is the suitable lower limit of the solution treatment temperature for the GH4169 alloy.