摘要
研究了定向凝固和普通铸造的Ren80合金在1123K静载荷下的蠕变裂纹扩展行为结果表明,Ren80合金蠕变裂纹扩展速率,可用应力强度因子较好地关联定向凝固合金蠕变裂纹与扩展速率较低。
The creep crack propagation in superalloy Rene80 of two differentmicrostructures, i.e., equiaxed grain structure by conventional casting and columnar grain bydirectional solidification, was investigated under static load at 1123 K. The creep crackgrowth rate, dα/dt, seems to be correlated with the stress intensity factor, K. The creep crackgrowth rate in the directionally solidified alloy is lower than that in the conventional castalloy, owing to the elimination of transverse grain boundaries. The effect of microstructure oncreep crack propagation has also been discussed.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1993年第4期A183-A186,共4页
Acta Metallurgica Sinica
关键词
蠕变裂纹扩展
耐热合金
Rene合金
Superalloy René 80
directional solidification
stress intensity factor
creep crack propagation