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采用Gleeble-1500热模拟试验机对2099合金进行等温热压缩试验,研究了基于动态材料模型的加工图,分析了该合金在变形温度为300~500℃,应变速率为0.001~10 s-1范围内安全区和失稳区的组织特征,并对其热加工工艺进行优化。结果表明,2099合金的加工失稳区主要位于300~420℃,0.001~0.02 s-1和300~500℃,0.562~10 s-1范围内。失稳区组织出现了局部流变、局部剪切、局部流变+局部剪切等特征;安全区组织以动态回复、动态回复+动态再结晶为主要特征。合金热加工工艺优化为:真应变<1.1时,工艺参数为380~420℃,0.025~1 s-1;真应变>3.4时,工艺参数为420~500℃,0.001~0.562 s-1。
The isothermal hot compression test of 2099 alloy was carried out on a Gleeble-1500 thermal simulation machine. The processing diagram based on the dynamic material model was studied. The deformation of the alloy 2099 at temperatures ranging from 300 ℃ to 500 ℃ and the strain rate of 0.001 ~ 10 s-1 The safe zone and the destabilization zone within the scope of the organizational characteristics, and its thermal processing technology to optimize. The results show that the processing instability zone of 2099 alloy is mainly in the range of 300 ~ 420 ℃, 0.001 ~ 0.02 s-1 and 300 ~ 500 ℃, 0.562 ~ 10 s-1. The characteristics of local rheology, local shear, local rheology and local shear appear in the zone of instability. The dynamic zone organization is mainly characterized by dynamic recovery and dynamic recovery + dynamic recrystallization. The thermal processing of the alloy is optimized as follows: the true strain of less than 1.1, the process parameters of 380 ~ 420 ℃, 0.025 ~ 1 s-1; true strain of 3.4, the process parameters of 420 ~ 500 ℃, 0.001 ~ 0.562 s-1.