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以耐热镍铬铁合金800H为研究对象,通过热压缩实验获得了流变应力和变形温度、应变速率的变化关系。结果表明,在高温压缩变形过程中,镍铬铁合金800H在变形温度不变时,随着应变速率的增加,流变应力逐渐增大;应变速率不变时,随着变形温度的升高,流变应力逐渐降低。通过镍铬铁合金本构关系模型确定了应变量和材料常数的关系,运用六次多项式拟合得到了具有代表性的函数关系式。
Taking refractory Ni-Fe-Fe alloy 800H as the research object, the relationship between the flow stress, the deformation temperature and the strain rate was obtained through the thermal compression experiment. The results show that the flow stress increases with the increase of strain rate when the deformation temperature is constant during the high-temperature compression deformation. When the strain rate is constant, as the deformation temperature increases, Variable stress gradually decreased. Through the constitutive model of nickel-iron-chromium alloy, the relationship between the strain and the material constant was determined, and the representative function relation was obtained by fitting six times polynomials.