【摘要】 对电子束层覆凝固Inconel 718合金（EBLS 718合金）和电子束精炼Inconel 718合金（EBS 718合金）进行等温压缩试验，变形温度分别为1 010,1 050,1 100,1 140℃,应变速率分别为0.001,0.01,0.1,1 s^-1,对比研究了2种合金的热变形流变行为，基于Arrhenius本构方程建立了2种合金的本构方程。结果表明：2种合金在不同变形温度和应变速率下的流变行为相似；流变应力均随着应变速率的增加而增大，随着变形温度升高而降低；由于存在层覆界面，EBLS 718合金在热压缩变形过程中在更低温度下出现了屈服下降现象，变形激活能更低，动态软化效应更加明显；2种合金变形机制均主要为晶格自扩散引起的高温攀移机制。更多还原

【Abstract】 Isothermal compression tests were conducted on electron beam cladding solidified Inconel 718 alloy（EBLS 718 alloy） and electron beam refining Inconel 718 alloy（EBS 718 alloy）. The deformation temperatures were 1 010, 1 050, 1 100, 1 140 ℃, and the strain rates were 0.001,0.01,0.1,1 s^-1. The thermal deformation rheological behaviors of the two alloys were compared and studied. Based on the Arrhenius constitutive equation, the constitutive equations of the two alloys were established. The results show that the rheological behavior of the two alloys under different deformation temperatures and strain rates was similar; the flow stress increased with increasing strain rate, and decreased with increasing deformation temperature. Due to the layered interface, the EBLS 718 alloy exibited yield decrease phenomenon at a lower temperature during hot compression deformation, lower deformation activation energy, and more obvious dynamic softening effect. The main deformation mechanism of the two alloys was mainly high temperature climbing mechanism caused by lattice self diffusion.更多还原