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利用Gleeble-3500试验机对一种新型铌合金在1000~1200℃下的热变形行为进行了热压缩模拟。结果表明:合金的流变应力大小对变形温度和应变速率非常敏感,流变应力随变形温度升高而降低,随应变速率提高而增大;合金的高温变形遵行幂函数方程,应力指数n为12.03,相应的激活能Q为577.63 k J/mol,并回归出了反映锻造热力学参数对材料成型性能影响的本构方程。
The thermal deformation behavior of a new type of niobium alloy at 1000-1200 ℃ was simulated by Gleeble-3500. The results show that the flow stress of the alloy is very sensitive to the deformation temperature and the strain rate. The flow stress decreases with the increase of the deformation temperature and increases with the increase of the strain rate. The deformation of the alloy follows the power function equation and the stress index n is 12.03, the corresponding activation energy Q is 577.63 kJ / mol, and the constitutive equation that reflects the effect of forging thermodynamic parameters on the formability of the material is regressed.