材料科学与工程学报2020，Vol.38Issue(3)：345-354,502,11.DOI:10.14136/j.cnki.issn1673-2812.2020.03.001
一种单晶高温合金铸态下的再结晶行为
Recrystallization Behavior of Single Crystal Superalloy at As-cast State
摘要
Abstract
The specimens of a single crystal superalloy at as-cast state were indented and heat-treated for 4h in vacuum at 1100,1150,1200,1250,1300 and 1340℃,respectively.Then,the recrystallized microstructures of the alloy were examined by some methods including electron back scattering diffraction (EBSD).The results show that cellular recrystallization (CRX)occurs in the samples after heating at 1100,1150 and 1200℃.Equiaxed recrystallization (ERX)develops while the specimens are heat-treated at 1340℃. Mixed recrystallization occurs in specimens heat-treated at 1250℃ and 1300℃.The discontinuous cellular recrystallization forms on the eutectic in the interdendrite region and equiaxed recrystallization nucleates and then grows rapidly in the dendritic arms.The majority of cellular recrystallization structures formed at 1100 and 1150℃ are low angle boundary (LAB).With the increase of heat-treatment temperature,the misorientation angle of recrystallization grains obviously increases.A great number of twins form inside the recrystallized grains at different temperature except 1100℃.With heat-treatment temperature increasing,the number of twins increases.关键词
单晶高温合金/再结晶/显微组织Key words
Single crystal superalloy/Recrystallization/Microstructure分类
矿业与冶金引用本文复制引用
史振学,刘世忠,李嘉荣..一种单晶高温合金铸态下的再结晶行为[J].材料科学与工程学报,2020,38(3):345-354,502,11.基金项目
Item sponsored by the Assembly Pre-research Found Program of China(9140A18040115HK51248) （9140A18040115HK51248）
