摘要
通过热压缩试验研究了FGH96粉末高温合金在应变速率为0．001～0．1s^-1，变形温度为1000～1100℃条件下的热成形性能，建立了FGH96的热变形方程。综合考虑变形温度和应变速率对FGH96合金的变形行为和可加工性的影响，基于动态材料模型建立了应变为0．07～0．5的能量耗散图，根据稳定性判据得到非稳定区，将两者叠加，就构成FGH96的热加工图。根据热加工图确定了实际可行的热变形工艺参数范围。
Aim. One reason why the forging of FGH96 （Chinese PM Ni-based Superalloy） superalloy is often unsatisfactory is the lack of its processing maps. We now present the results of our research on determining such maps. The hot workability of FGH96 superalloy has been investigated by means of hot compression tests carried out in the strain rate range of 0. 001-0. 1 s^-1 and the temperature range of 1 000 -1 100℃. A constitutive equation of FGH96 superalloy for the flow stress, eq. （4） in the full paper, has been given. Keeping in mind the effects of the deformation temperatures and the strain rates on deformation behavior and workability of FGH96, we generated its power dissipation maps on the basis of dynamic materials modeling. Unstable deformation regions were defined by applying the stability criteria and instability maps were obtained. The processing maps, give respectively in Fig. 4 in the full paper for different true strains of 0.07, 0.08, 0. 10, 0. 15, 0.20, 0. 30, 0.40 and 0. 50, were obtained by combining power dissipation maps with instability maps. The feasible processing parameters ranges were defined by the processing maps.
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
2007年第5期652-656,共5页
Journal of Northwestern Polytechnical University
基金
航空基础科学基金(03H53048)资助
关键词
粉末高温合金
热变形方程
热加工图
FGH96 superalloy, hot deformation equation, processing map
