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研究了不同热处理制度对90×3,200×3,200mm TC4ELI厚板显微组织和力学性能的影响。结果表明:经720℃~930℃不同的热处理制度处理后,板材显微组织均为均匀细小的α+β组织,随着退火温度的升高,α相呈球化长大趋势;当在930℃退火时,厚板组织得到了完全再结晶,晶粒的等轴化程度更好,条状相的尺寸发生明显变化,长宽比减小,次生相增多,且力学性能满足GB/T3621-2007要求,纵横向性能基本接近。在相变点以上的1,000℃进行退火后,厚板组织呈典型的魏氏组织,力学性能满足AMS4905要求。
The effects of different heat treatment systems on the microstructure and mechanical properties of 90 × 3,200 × 3,200mm TC4ELI slabs were studied. The results show that the microstructure of the plate is uniform and small α + β after being treated by different heat treatment systems at 720 ℃ ~ 930 ℃. As the annealing temperature increases, When annealed, the microstructure of the slab has been completely recrystallized, the equiaxed degree of the grains is better, the size of the stripe phase changes obviously, the aspect ratio decreases, the secondary phase increases, and the mechanical properties meet the requirements of GB / T3621 -2007 requirements, vertical and horizontal performance is basically close. After annealed at 1,000 ℃ above the transformation point, the platelet structure is typical of Widmanstatten and its mechanical properties meet the requirements of AMS4905.