Model for healing of creep cavities in nickel-based superalloys under hot isostatic pressing

被引：16
|
作者：
Zhou, Yu [1 ,2 ]
Zhang, Zheng [1 ]
Zhong, Qunpeng [1 ]
Zhao, Zihua [1 ]
机构：
[1] Beijing Univ Aeronaut & Astronaut, Sch Mat Sci & Engn, Key Lab Aerosp Mat & Performance, Minist Educ, Beijing 100191, Peoples R China
[2] Anhui Univ Technol, Sch Mech Engn, Maanshan 243002, Anhui, Peoples R China
来源：
COMPUTATIONAL MATERIALS SCIENCE | 2012年 / 65卷
关键词：
Shrinkage model; Hot isostatic pressing; Superalloys; Grain boundaries; Diffusion; TURBINE-BLADES; REJUVENATION; ALLOY;
D O I：
10.1016/j.commatsci.2012.08.019
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A healing model for creep cavities under hot isostatic pressing (HIP) is proposed, according to the healing characteristics and thermodynamic theory. The stress gradient around the cavity is considered as a driving force for atomic diffusion in this shrinkage model. The effects of HIP temperature and hydrostatic pressure on the healing kinetics of creep cavities are studied by numerically integrating the shrinkage rate equation. A useful healing map is constructed, showing the healing time as a function of temperature and pressure. This model provides a more realistic basis for the selection of appropriate HIP parameters to rejuvenate the creep damage present in high-temperature components. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：320 / 323
页数：4
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