In Situ Characterization of Inconel 718 Post-Dynamic Recrystallization within a Scanning Electron Microscope
In Situ Characterization of Inconel 718 Post-Dynamic Recrystallization within a Scanning Electron Microscope
复制标题
DOI：
10.3390/met7110476
复制
发表时间：
2017-11
期刊：
影响因子：
--
通讯作者：
M. Zouari;R. Logé;N. Bozzolo
中科院分区：
文献类型：
--
作者：
M. Zouari;R. Logé;N. Bozzolo
研究了不同动态再结晶体积分数的Inconel 718合金在无δ相颗粒存在的条件下热变形后动态区域内的组织演变。原位退火处理进行模仿后动态条件内的扫描电子显微镜（SEM）室建议发生的metadhesic和静态再结晶机制。静态再结晶除了观察到亚稳态再结晶，只有当初始动态再结晶的体积分数很小。动态再结晶晶粒的初始体积分数似乎是决定性的后续微观结构演变机制和动力学。此外，观察到退火孪晶的形成沿着再结晶晶粒的生长，但随后孪晶密度随着材料进入毛细驱动的晶粒生长区域而降低。
Microstructure evolution within the post-dynamic regime following hot deformation was investigated in Inconel 718 samples with different dynamically recrystallized volume fractions and under conditions such that no δ-phase particles were present. In situ annealing treatments carried out to mimic post-dynamic conditions inside the Scanning Electron Microscope (SEM) chamber suggest the occurrence of both metadynamic and static recrystallization mechanisms. Static recrystallization was observed in addition to metadynamic recrystallization, only when the initial dynamically recrystallized volume fraction was very small. The initial volume fraction of dynamically recrystallized grains appears to be decisive for subsequent microstructural evolution mechanisms and kinetics. In addition, the formation of annealing twins is observed along with the growth of recrystallized grains, but then the twin density decreases as the material enters the capillarity-driven grain growth regime.