High temperature creep-rupture features of nickel-base single crystal superalloy
来源期刊：中国有色金属学报(英文版)2005年第z3期
论文作者：水丽 金涛 田素贵 胡壮麒
文章页码：77 - 81
Key words：single crystal nickel-base superalloy； tensile creep； microstructure； fracture
Abstract: The creep and rupture behavior of a nickel-base single crystal superalloy with [001] orientation was investigated at temperature of 10001040℃ and stress in the range of 150320MPa. The creep features and microstructure were studied by means of the measurement of creep curves and TEM observation. The results show that all creep curves exhibit a short primary and a dominant accelerated creep stage. From the creep parameters and TEM observations, it is suggested that the primary deformation mechanism has a change from precipitatation shearing by pairs of dislocation in the high applied stress region to dislocations climb around the γ′ particles in the low applied stress region. Furthermore, the detailed failure process and fracture surfaces were analyzed by SEM observation.
