镍基精密电阻合金热变形行为及热加工图研究

    Research on Thermal Deformation Behavior and Hot Processing Map of Nickel-based Precision Resistance Alloy

    • 摘要: 采用热模拟技术对镍基精密电阻合金进行热压缩实验,系统的研究了合金在变形参数800~1100℃、0.01 ~10 s-1下的热变形行为。依据热压缩实验数据,绘制并分析合金流变应力曲线,考虑绝热温升效应并对其进行修正,基于修正后的流变应力曲线构建合金的本构方程。依托动态材料模型,建立了合金的热加工图,结合不同变形参数下的显微组织特征,分析组织演变规律。结果表明:合金流变应力曲线呈现典型的动态再结晶特征;高应变速率引起的绝热温升效应经修正后流变应力得到明显的提升;合金在800~1100℃温度范围内热变形激活能为332.315 kJ·mol-1;通过分析合金的热加工图并结合对应区域的显微组织观察,得到合金的热加工工艺参数为1060~1100℃、0.01~0.06 s-1

       

      Abstract: The hot deformation behavior of nickel-based precision resistance alloy was systematically studied through hot compression tests over a temperature range of 800-1100 ℃ and strain rates ranging from 0.01 s-1 to 10 s-1. Flow stress curves were plotted and analyzed based on the experimental data, considering and subsequently correcting for the effect of adiabatic temperature rise. A constitutive equation for the alloy was then established using the corrected flow stress data. The dynamic material model (DMM) was employed to develop the hot processing map of the alloy, while microstructural observations under varying deformation conditions were used to elucidate the evolution of microstructural features. The results indicate that the flow stress curves exhibit typical characteristics of dynamic recrystallization. After correction for the adiabatic temperature rise at high strain rates, the flow stress values show a noticeable increase. The activation energy for hot deformation within the temperature range of 800-1100 ℃ is determined to be 332.315 kJ·mol-1. By analyzing the hot processing map in conjunction with the corresponding microstructural observations, the optimal hot working parameters for the alloy are identified as 1060-1100 ℃ with strain rate of 0.01 s-1 to 0.06 s-1.

       

    /

    返回文章
    返回