摘要
研究了一种镍基单晶高温合金[001],[011]和[111]三个晶体取向的组织和性能。结果表明,晶体取向对合金枝晶组织形态和偏析存在显著影响,而合金的弹性模量和持久性能也存在明显的各向异性。在弹性模量方面,[111]取向最大,[011]取向次之,[001]取向最小。对于持久寿命,在871℃/552MPa下,[001]取向的持久寿命最高,[111]取向的延伸率最高;在1010℃/248MPa下,[111]取向的持久寿命最高,[001]取向的延伸率最高;两种实验条件下,[011]取向的持久寿命都最低。
The microstructure and property of a nickel base single crystal superalloy with various crystallographic orientations of [001], [010] and [111] has been investigated. The results show that the dendrite morphology and micro-segregation are strongly influenced by crystallographic orientations although the chemical compositions of alloy keep as constant. The Young＇s modulus and stress rupture lives of single crystal alloys also exhibit obvious anisotropy. The Young＇s modulus decreases with the sequence of [111], [0ll] and [001] orientation. The longest stress rupture life is obtained in the single crystal with [001] orientation and the alloy with [111] orientation shows the maximum elongation under the testing condition of 871℃/552MPa, while the alloy with [111] orientation appears the longest stress rupture life and the maximum elongation was got in EO01] orientation under the testing condition of 1010℃/248MPa. Under the both testing conditions, the alloy with [011] orientation presents the lowest stress rupture life.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2008年第2期58-61,共4页
Journal of Materials Engineering
关键词
单晶高温合金
各向异性
弹性模量
持久性能
single crystal superalloy
anisotropy
Young＇s modulus
stress rupture property
