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为了确定BT25y钛合金的最佳等温锻造工艺参数,研究了20%,40%和60%这3种变形程度对其组织和性能的影响。结果表明:随着变形程度的提高,原始的β大晶粒逐渐被压扁,β晶界发生一定程度的破碎,晶内片状α相宽度加大,组织变得更加均匀;同时,合金强度呈先减小后增大的趋势,伸长率和断面收缩率变化规律相同,都呈递增趋势,断裂韧性基本上也是随变形量的增加而提高,室温拉伸断裂方式由穿晶解理断裂转变为准解理断裂,在较大变形量时又演变成韧性断裂。实验结果表明在本实验条件下,等温锻造变形量为60%时可以获得较好的组织性能匹配。
In order to determine the optimal isothermal forging parameters of BT25y titanium alloy, the effects of three deformations of 20%, 40% and 60% on its microstructure and properties were studied. The results show that with the increase of the deformation degree, the original β large grains gradually crushed and the β grain boundaries crumble to a certain extent, the width of the α phase in the grains increases and the structure becomes more uniform. Meanwhile, the strength of the alloy Showed the trend of decreasing firstly and then increasing. The change rule of elongation and reduction of area was the same, showing an increasing tendency. The fracture toughness basically increased with the increase of deformation. The room temperature tensile fracture mode was translocated by transgranular cleavage fracture Into quasi-cleavage fracture, in the larger deformation and evolved into a ductile fracture. The experimental results show that under the experimental conditions, the isothermal forging deformation of 60% can get better performance match.