摘要
采用孔挤压强化工艺使23Co14Ni12Cr3MoE高强度钢表面层产生残余压应力,用X射线应力分析仪测定了孔挤压强化残余应力场,对比了带孔试样机械加工与挤压强化状态下的疲劳S-N曲线,用SEM观察分析了疲劳断口特征。结果表明,23Co14Ni12Cr3MoE高强度钢经孔挤压强化后,1×106循环周次下的条件疲劳极限提高了26%;孔挤压试样的裂纹特征为1/2椭圆状的表面裂纹,而机械加工试样的裂纹特征是1/4椭圆状的角裂纹。
Cold hole expansion was employed to improve fatigue performance of 23Co14Ni12Cr3MoE steel and residual stresses were measured by X-ray stress analyzer.The fatigue S-N curves and fatigue limits for 1×10^6 cycles were determined experimentally.Moreover,the fatigue fractograph of specimens was analyzed by SEM.The results show that the fatigue limit is increased with 26% by cold hole expansion and the fatigue crack is 1/2 ellipsoidal surface crack for cold hole expanded specimens; whereas it is 1/4 ellipsoidal corner crack for machined specimens.
出处
《金属热处理》
EI
CAS
CSCD
北大核心
2007年第11期34-36,共3页
Heat Treatment of Metals
基金
"十一五"武器装备先进制造技术预先研究项目(No.51318060102和No.513180001)
北京航空材料研究院院科学基金项目(2004172)
