High temperature deformation mechanism and evolution of dislocation structure during creep of Ni-Base superalloy 713LC |
| |
Authors: | In Soo Kim Baig Gyu Choi Seong Moon Seo Chang Yong Jo |
| |
Affiliation: | (1) Eco-Materials Research Center, Korea Institute of Machinery and Materials, 66, Sangnam-Dong, 641-010 Changwon, Geongnam, Korea |
| |
Abstract: | Creep deformation of cast nickel base superalloy 713LC has been investigated in a temperature range of 723 to 982°C. The values
of the stress exponent and activation energy for creep of the alloy vary with a combination of temperature and stress. Introduction
of threshold stress for creep of the alloy provided an explanation of the high values of the stress exponent and the apparent
activation energy. Microstructural evolution of the alloy with creep deformation has also been studied. The analysis of the
creep mechanism has been supplemented by microstructural observations after deformation under various test conditions. The
dislocation structure of the alloy at high temperature and low stress was different from that at low temperature and high
stress. Shearing of γ′ particles by dislocation pairs was the dominant creep mechanism at low temperature and high stress
whereas dislocation climb over γ′ particles was the rate controlling process of creep at high temperature and low stress. |
| |
Keywords: | 713LC creep mechanism activation energy particle cutting climb |
本文献已被 SpringerLink 等数据库收录! |