【摘要】 采用Gleeble-3500热模拟实验机对新型喷射成形镍基高温合金在1050~1140℃,应变速率为0.01~10.0 s-1,最大工程应变量为80%的条件下,进行了等温恒应变轴向压缩热变形实验。确定了该合金最佳热变形条件为温度1050℃,应变速率10.0 s-1,工程应变量20%~60%;分析了变形条件对流变应力、峰值应力及软化系数的影响规律,在相同的应变速率下,随着温度的升高,峰值应力降低;在相同的实验温度下,随着应变速率的升高,峰值应力降低;软化系数增加。计算了该喷射成形合金的热变形激活能为920.74 kJ.mol-1,从而确定了该合金的本构方程,经验算此方程较好地描述该合金的变形特点。更多还原

【Abstract】 The hot deformation characteristics of a new type spray formed Ni-base superalloy were investigated by compression testing at isothermal constant strain rates in the range of 0.01～0.1 s^-1,and testing temperature in the range of 1050～1140 ℃ with maximum engineering strain 80% by means of Gleeble-3500 thermal mechanical simulator.The optimum deformation parameters were determined by hot compression testing,1050 ℃,10.0 s^-1,engineering strain 20%～60%.The influence of deformation parameters on flow stress,peak stress and softening coefficient were analyzed.The peak stress is decreased with testing temperature increase at the same strain rates,and the peak stress is increased with strain rates increase at the same testing temperature.With the increasing strain rates,the soften coefficient is increased.The constitutive equation of the spray formed superalloy is presented by calculating the deformation activation energy 920.74 kJ·mol^-1.The constitutive equation represents well the spray formed superalloy deformation features.更多还原