摘要
本文测定了300M钢经870℃油淬和250℃等温淬火后小能量多次冲击的A(冲击能量)—N(冲击破断周次)曲线,考查了应力集中系数对A—N曲线的影响,比较了油淬组织和等温淬火组织的多冲缺口敏感性,着重观察和分析了冲击疲劳断口起裂部位的宏观特征,并依此对该钢在不同应力集中系数和冲击能量下的多冲疲劳裂纹萌生机制作了初步探讨。
The repeated impact fatigue A-N (impact energy-cycle number)curves of 300M steel oil quenched and isothermally treated at 250℃ were determined. The effect of stress concentration factor on the A-N curve was examined. The notch sensitivities to the microstructures gained by oil quenching and isothermal treatment were compared under the repeated impact load. Emphatically, based on the observation and analysis of fracture at initial region of the samples, the mechanism of crack initiation was studied under the condition of different stress concentration factor and impact energy.
出处
《材料工程》
EI
CAS
CSCD
北大核心
1990年第3期6-9,共4页
Journal of Materials Engineering
