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通过TA15多组试样的热物理模拟压缩试验获得了温度1073～1323 K、应变速率0.01～10 s-1下的真应力-真应变数据,以此作为计算应变速率敏感指数(m值)的底层材料模型。以一组拟合图和3-D曲面揭示了应力、温度、应变速率和应变量共同作用诱导多种变形机制变化及同时存在将引起应变速率敏感系数m值的剧烈响应。通过m值的正负判断了变形稳定区与失稳区,为建立TA15合金高温变形时的加工图并合理制定锻造工艺,为有效控制及提高构件性能和质量提供了依据。
The true stress-true strain data at temperature 1073 ~ 1323 K and strain rate 0.01 ~ 10 s-1 were obtained by thermophysical simulation compression test of TA15 samples. The stress-strain index (m value) The underlying material model. A set of fitted graphs and 3-D surfaces revealed that the combination of stress, temperature, strain rate and strain induced a variety of deformation mechanisms and the simultaneous presence of violent response to the value of m, which would cause strain rate sensitivity. Determine the deformation stability zone and destabilization zone by the positive and negative values of m. In order to establish the processing diagram of TA15 alloy under high temperature deformation and reasonably develop the forging process, it provides a basis for effective control and improvement of component performance and quality.