摘要
在不同加载波形及温度下研究了NiaAl(B)的疲劳-蠕变裂纹扩展行为.结果表明。加载波形对高温疲劳-蠕变裂纹扩展速率及断裂行为有强烈影响,拉伸保持时间的叠加明显增加合金高温下的蠕变裂纹扩展速率.与高温合金相比,Ni3Al(B)在600和800℃下的裂纹尖端氧脆及疲劳-蠕变交互作用更为明显,裂纹扩展速率随温度发生明显变化.B在高温下对Ni3Al(B)的韧化作用与温度和加载波形有关.
The study of fatigue-creep crack growth of Ni3Al(B) alloy under different loading waveforms in air at elevated temperatures was carried out. It was found that there are strong effects of loadingwaveform on fatigue crack growth rate(FCGR). The applied tensile hold accelerated the FCGR at elevatedtemperature. As compajred with superalloys, the oxidation-induced embrittlement at the crack tip andfatigue-creep interaction at 600 and 800℃ are more significant. The crack growth rate changes stronglywith increasing temperature. The effects of boron on toughness and fatigue--creep crack growth of Ni3Al(B)at elevated temperatures were related to temperature and loading waveform.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1999年第6期589-593,共5页
Acta Metallurgica Sinica
基金
辽宁省博士启动基金!971112
关键词
加载波形
温度
Ni3Al(B)合金
疲劳
蠕变
loading waveform, temperature, Ni3Al(B) alloy, creep-fatigue crack growth