摘要
对经不同温度加热随后空冷的ＴＣ４钛合金在－１９６～３５０℃范围内进行了外约束型热疲劳试验。结果表明：经单相区加热的合金，其热疲劳裂纹易于沿原β相晶界处萌生，以穿晶的方式扩展，对热疲劳裂纹萌生抗力较低。而经９５０℃加热的合金，其热疲劳裂纹易于沿初生α相与基体（条形的α＋β相）的界面处萌生，裂纹易于切过条形的α＋β相扩展，其热疲劳裂纹萌生抗力最高。经９００℃加热的合金，其热疲劳裂纹易于沿初生α相与基体的界面处萌生并沿其扩展。
The outer constraint thermal fatigue tests between 196℃ and 350℃ were performed on TC4 alloy The effect of heat temperature on the thermal fatigue behavior of TC4 alloy was investigated The results show that thermal fatigue cracks initiate mainly along prior beta grain boundaries for the alloy heated at above the β transus,and propagate by transgranular fracture The cracks initiate along the interface between primary α and transformed β for the alloys heated at 950℃,and propagate by transgranular transformed β The cracks initiate and propagate along the interface between primary α and transformed β for the alloy heated at 900℃,The thermal fatigue crack initiation resistance of the alloys heated at 1020℃、983℃ and 900℃ is lower,that of the alloy heated at 950℃ is the highest
出处
《宇航学报》
EI
CAS
CSCD
北大核心
1997年第3期46-50,共5页
Journal of Astronautics
