利用Gleeble 1500+热模拟试验机研究了镍基690合金在800～1300℃温度范围内,应变速率在0.1～ 10 s-1范围内热压缩过程中合金的热变形行为.结果表明,690合金在热压缩过程中产生的流变应力受变形温度和应变速率两个参数的显著影响,其对应的峰值应力随变形温度的降低和应变速率的增加而增大.利用数据拟合计算得到热变形激活能等参数,建立了用于表征峰值应力和变形温度、应变速率之间相互关系的690合金热变形本构方程.基于动态材料模型绘制了690合金的热加工图,结合该合金在不同变形温度-应变速率区域的高温变形特征以及显微组织形貌,获得了两个适合690合金热加工的变形温度-应变速率区域.
The hot deformation behavior of 690 alloy during hot compression tests in the temperature range of 800-1300 ℃ and strain rate range of 0.1-10 s-1 was studied by a Gleeble 1500 + thermal mechanical simulator.The results indicate that flow stress of the 690 alloy is sensitive to deformation temperature and strain rate,and peak stress increases with decreasing of temperature and increasing of strain rate.Thermal deformation activation energy and other parameters are calculated by fitting the data,and the thermal deformation constitutive equation of the 690 alloy is established for characterizing the relationship among the peak stress,deformation temperature and strain rate,and the apparent activation energy of this alloy is about 300 kJ/mol.The hot processing map of the 690 alloy is established based on the dynamic material model,combining the high temperature deformation characteristics of the alloy at different deformation temperatures-strain rate region with microstructure,two deformation temperature-strain rate regions for hot processing of the 690 alloy are obtained.
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