Impact Factor:4.7
DOI number:10.1016/j.matchar.2018.03.039
Affiliation of Author(s):中南大学粉末冶金研究院
Teaching and Research Group:高温结构材料研究所
Journal:Materials Characterization
Funded by:中国国家重点研究与发展计划（2016YFB0701404），中国国家自然科学基金（NSFC）（51401242）
Key Words:Powder metallurgy, Superalloy, Prior particle boundary, Hot consolidation, Plastic deformation
Abstract:Powder metallurgy superalloys are widely used to produce critical rotating parts in turbine engines. However, the issues like what is the driving force of precipitation on prior particle boundary (PPB) during consolidation and how the PPB structure evolves during plastic deformation still remain to be resolved. In this study, with the characterization of the microstructure evolution from powder, consolidation, to plastic deformation, the segregation of alloying elements on the particle boundaries at elevated temperature was analyzed by equilibrium thermodynamic calculations, and the distortion of PPB structure under large plastic deformation was quantitively simulated by finite element (FE) methods. The results indicated that surface energy serves as the main driving force of PPB precipitation and hot extrusion could distort the PPB structure and yield more uniformly refined grains.
Co-author:Yunping Li, Chenze Liu, Chuan Yang, Hanhui Ding, Lan Huang, Feng Liu, Zijun Qin
First Author:Liming Tan
Indexed by:Article
Correspondence Author:Liang Jiang, Feng Liu
Discipline:Engineering
First-Level Discipline:冶金
Volume:140
Page Number:30-38
ISSN No.:1044-5803
Translation or Not:no