High-temperature deformation behavior and processing map of the as-cast Inconel 625 alloy
High-temperature deformation behavior and processing map of the as-cast Inconel 625 alloy
复制标题
铸态Inconel 625合金的高温变形行为及加工图
DOI：
10.1007/s12598-020-01474-6
复制
发表时间：
2020-07-02
期刊：
影响因子：
8.8
通讯作者：
Ding, Yu-Tian
中科院分区：
文献类型：
--
作者：
Jia, Zhi;Gao, Ze-Xi;Ding, Yu-Tian
针对Inconel 625合金管材传统挤压工艺存在的问题，研究了Inconel 625合金铸态的热变形行为。通过Gleeble-3500进行热压缩实验以研究Inconel 625在900-1200 °C温度范围和0.01-10.00 s-1应变速率范围内的热变形行为。利用电子背散射衍射（EBSD）技术对热压缩后的显微组织进行了分析，研究了温度和应变速率对显微组织特征的影响。结果表明，温度对加工图的影响较大，而应变速率对加工图的影响较小。结果表明，随着应变的增加，失稳区逐渐转向低温低应变率区，而高温失稳区范围缩小。铸态Inconel 625合金的最佳条件被确定为高应变速率区（温度为1100-1200 °C，应变速率为1.00-10.00 s-1），耗散效率高于0.28。EBSD显微组织分析表明，在此变形条件下，Inconel 625合金发生了完全的动态再结晶，获得了细小的晶粒组织。
AbstractA short process of Inconel 625 alloy tube was developed to solve the problems of the traditional extrusion process, and particular attention was paid on the hot deformation behavior of the as-cast Inconel 625 alloy. The hot compression experiments were performed to study the hot deformation behavior of Inconel 625 in the temperature range of 900–1200 °C and strain rate range of 0.01–10.00 s−1by Gleeble-3500. The hot compressed microstructure was examined to study the effects of temperature and strain rate on the microstructural characteristic by electron backscatter diffraction (EBSD). The results show that the processing maps were greatly influenced by the temperature rather than the strain rate. It is found that with the strain increasing, the instability zone gradually turned to the low-temperature and low strain rate area, while the range of high-temperature instability area shrank. The optimum condition of the as-cast Inconel 625 alloy was determined as high strain rate region (temperature of 1100–1200 °C, strain rate of 1.00–10.00 s−1) with the dissipation efficiency of above 0.28. As illustrated by microstructural characteristic of EBSD analysis, the perfect dynamic recrystallization occurred and fine grain structure was obtained under this deformation conditions.Graphic abstractThe hot processing map and microstructure evolution of as-cast Inconel 625 alloy at various temperatures and strain rates.