Microstructural evolution of a nickel-based superalloy during hot deformation

被引：157
作者：
Chen, Xiao-Min [1 ,2 ,3 ]
Lin, Y. C. [1 ,2 ,3 ]
Chen, Ming-Song [1 ,3 ]
Li, Hong-Bin [4 ]
Wen, Dong-Xu [1 ,3 ]
Zhang, Jin-Long [1 ,3 ]
He, Min [1 ,3 ]
机构：
[1] Cent S Univ, Sch Mech & Elect Engn, Changsha 410083, Hunan, Peoples R China
[2] Cent S Univ, Light Alloy Res Inst, Changsha 410083, Hunan, Peoples R China
[3] State Key Lab High Performance Complex Mfg, Changsha 410083, Hunan, Peoples R China
[4] Hebei United Univ, Coll Met & Energy, Tangshan 063009, Peoples R China
来源：
MATERIALS & DESIGN | 2015年 / 77卷
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
Hot deformation; Alloy; Dynamic recrystallization; Microstructural evolution; DYNAMIC RECRYSTALLIZATION BEHAVIOR; AUSTENITIC STAINLESS-STEEL; MECHANICAL-PROPERTIES; ELEVATED-TEMPERATURE; PROCESSING MAP; FRACTURE CHARACTERISTICS; ALUMINUM-ALLOY; FLOW BEHAVIOR; KINETICS; SIMULATION;
D O I：
10.1016/j.matdes.2015.04.004
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Hot compressive tests of a nickel-based superalloy are performed under the strain rate range of 0.001-1 s(-1) and deformation temperature range of 920-1040 degrees C. Optical microscopy (OM) and transmission electron microscopy (TEM) are employed to investigate the evolution of dynamic recrystallized (DRX) grain and dislocation substructure. It is found that the effects of deformation degree, strain rate and deformation temperature on DRX grain are significant. When the deformation degree or temperature is increased, the number of DRX grains rapidly increases. But, the increase of strain rate reduces the number of DRX grains. The dislocation substructure is also very sensitive to the deformation degree, strain rate and deformation temperature. With the increase of deformation degree, the evolution of dislocation substructure can be characterized as: high dislocation density --> dislocation network --> subgrain --> DRX grain. Under high deformation temperatures or low strain rates, the dislocation substructure can be easily annihilated and rearranged because of the occurrence of DRX. Based on the evaluated DRX volume fractions, the contour map is constructed to optimize the hot deformation parameters. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：41 / 49
页数：9
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