摘要
采用Gleeble-1500热模拟实验机对Nimonic 80A高温合金进行了双道次热压缩实验,研究了该合金在变形温度1050～1150℃,应变速率0.01～2.5 s-1,预应变0.08～0.14,不同间隙时间（0.5～5 s）下的静态再结晶行为。得到了Nimonic 80A高温合金不同变形条件下的真应力-应变曲线及变形后奥氏体晶粒组织,分析了变形温度、应变速率和预应变对该合金静态再结晶行为的影响。结果表明：变形温度、应变速率和预应变对Nimonic 80A高温合金的静态再结晶行为有着显著的影响。Nimonic 80A高温合金静态软化分数随着变形温度、应变速率和预应变的增大而增大,且静态再结晶晶粒尺寸随着温度的升高或应变速率的降低而增大。根据实验结果,建立了Nimonic 80A高温合金静态再结晶动力学模型。将静态再结晶动力学模型预测结果和实验结果进行比较,二者吻合良好,表明本文提出的模型可以较为准确的预测Nimonic 80A高温合金静态软化行为。
In order to investigate the static recrystallization（ SRX） behavior of deformed Nimonic 80 A superalloy,a series of isothermal interrupted hot compression tests were performed on a Gleeble-1500 thermo-mechanical simulator.Compression tests were performed under different inter-pass time（ 0.5-5 s） in the deformation temperature range of 1050-1150 ℃ with the strain rate range of 0.01-2.5 s- 1and the pre-strain range of 0.08-0.14.The true strain-stress curves and microstructure of the alloy were obtained and the effects of deformation temperature,strain rate and pre-strain on its SRX behavior were discussed.The results reveal that the effects of deformation temperature,strain rate and pre-strain on the SRX behavior are significant.The static softening fraction increase with the increase of deformation temperature,strain rate and pre-strain and the SRX grain size increase with the increase of deformation temperature and the decrease of the strain rate.Based on the experimental results,the SRX kinetic model of Nimonic 80 A alloy is proposed.The comparison between the predicted results of the model and the experimental ones shows good agreement,which indicates the proposed model can give an accurate prediction of the static softening behavior for Nimonic 80 A superalloy.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2016年第10期192-199,共8页
Transactions of Materials and Heat Treatment
