摘要
对DZ125定向凝固铸造镍基高温合金进行了三种相位和两种试样尺寸的热机械疲劳实验研究。实验结果表明:在热机械载荷下,试样表面和内部温度梯度以及蠕变和氧化损伤的存在,导致试样工作段直径影响热机械疲劳寿命。当应变水平较高(疲劳寿命较短)时工作段直径为8mm试样的疲劳寿命和工作段直径为6mm试样的疲劳寿命无明显差别。当应变水平较低(疲劳寿命较长)时工作段直径为8mm试样的疲劳寿命比工作段直径为6mm试样的疲劳寿命长。
Thermomechanical fatigue（TMF） life of three temperature-strain phase angles and two specimen dimensions was studied in directional solidification （DS） superalloy DZ125. The results showed that fatigue, creep and oxidation damage always developed during TMF,temperature gradient occurred on surface and inside of specimen. Specimen dimension affected TMF life in DS superalloy DZ125. At high strain levels with shorter fatigue life, there were no evidence difference between TMF life of 8mm diameter specimen and fatigue life of 6mm diameter specimen. At low strain levels with longer fatigue life,TMF life of 8mm diameter specimen is longer than that of 6mm diameter specimen.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2007年第5期28-30,35,共4页
Journal of Materials Engineering
关键词
热机械疲劳
尺寸
蠕变
氧化
损伤
寿命
thermomechanical fatigue
dimension
creep
oxidation
damage
life
