The evolution history of superalloy powders during hot consolidation and powders plastic deformation

被引：28

作者：

Tan, Liming

Li, Yunping

Liu, Chenze

Yang, Chuan

Ding, Hanhui

Huang, Lan

Liu, Feng ^{[1
]}

Qin, Zijun

Jiang, Liang ^{[1
]}

机构：

[1] Cent S Univ, State Key Lab Powder Met, 932 South Lushan Rd, Changsha 410083, Hunan, Peoples R China

来源：

MATERIALS CHARACTERIZATION | 2018年 / 140卷

关键词：

Powder metallurgy; Superalloy; Prior particle boundary; Hot consolidation; Plastic deformation; NICKEL-BASE SUPERALLOY; METALLURGY SUPERALLOY; MECHANICAL-PROPERTIES; HEAT-TREATMENT; GRAIN-GROWTH; MICROSTRUCTURE; BEHAVIOR; ALLOYS; RECRYSTALLIZATION; INCONEL-ASTERISK-718;

D O I：

10.1016/j.matchar.2018.03.039

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页码：30 / 38

页数：9

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