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采用Gleeble-3500热模拟试验机对X2A66合金进行等温热压缩实验,变形温度为623.15~743.15 K、应变速率为0.001~10 s~(-1),并利用双曲正弦函数和动态材料模型,建立合金峰值应力的本构方程和加工图。结果表明:X2A66合金的流变应力随温度的升高而减小,随应变速率的增加而增大;X2A66合金的温度敏感性不受应变速率的影响,高应变速率(应变速率高于0.1 s~(-1))时的速率敏感性高于低应变速率时的速率敏感性。X2A66合金等温压缩时峰值流变应力和应变速率之间满足双曲正弦函数关系,其本构方程为:e(5)=5.09×10~9[sinh(0.019σ)]~(4.54414)exp(–145.377/RT)。在实验工艺参数范围内,X2A66合金的失稳区集中在高应变速率区,当应变速率为0.01~0.3 s~(-1),温度为700~743 K时是耗散效率的峰值区域,也是X2A66合金最佳的热加工工艺区。
The isothermal hot compression tests of X2A66 alloy were carried out by using Gleeble-3500 thermal simulation machine. The deformation temperature was 623.15 ~ 743.15 K and the strain rate was 0.001 ~ 10 s ~ (-1). Using hyperbolic sine function and dynamic material model, Establishing the Constitutive Equation and Machining Diagram of Alloy Peak Stress. The results show that the flow stress of X2A66 alloy decreases with the increase of temperature and increases with the increase of strain rate. The temperature sensitivity of X2A66 alloy is not affected by the strain rate. The high strain rate (strain rate higher than 0.1 s ~ (-1)) is higher than that of low strain rate. The relationship between the peak flow stress and the strain rate of isothermal compression of X2A66 alloy satisfies the hyperbolic sine function, and its constitutive equation is: e (5) = 5.09 × 10 ~ 9 sinh (0.019σ)] (4.54414) exp -145.377 / RT). In the range of experimental parameters, the instability zone of X2A66 alloy is concentrated in the high strain rate zone. When the strain rate is 0.01 ~ 0.3 s ~ (-1) and the peak temperature is 700 ~ 743 K, it is also the peak area of dissipation efficiency X2A66 alloy best thermal processing process area.