TA15应变速率敏感指数对变形温度、应变和应变速率的响应规律
Response Rule of Strain Rate Sensitivity of TA15 to Deformation Temperature, Strain and Strain Rate
权国政1, 王 阳1, 周 杰1, 熊运森2
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作者单位：1. 重庆大学 材料科学与工程学院, 重庆 400044; 2. 中国第二重型机械集团公司, 四川 德阳 618000
中文关键字：TA15 合金； 热模拟试验； 流动应力模型； 应变速率敏感指数
英文关键字：TA15 alloy; heat simulation experiment; flow stress model; strain rate sensitivity
中文摘要：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。
英文摘要：Several series of billet samples were compressed on heat physical simulation machine under deformation temperature of 1073～1323 K and strain rate of 0.01～10 s-1, then the true stress-strain data was used to calculate the strain rate sensitivity (m-value). A series of fitting charts and 3D surfaces reveal that the effects of stress, temperature, strain rate and strain on the deformation mechanism variations may result in the dramatic response of m-value. From the m value, the stable and unstable deformation regions were preliminarily indentified, which can help estabilish TA15 alloy processing maps at high deformation temperature. In addition, it also provides basis for the rational design of the forging process as well as the promotion of component quality .