摘要
借助金相显微镜、X射线衍射仪对超声波冲击加工与传统抛光后试样表层组织性能进行对比分析,研究超声波冲击加工对30Cr Mn Si Ni2A疲劳寿命的影响。结果表明,经超声冲击后,试样表层组织变得更加细密从而阻止裂纹在表面萌生,形成更高的残余压应力减缓了裂纹扩展速率,使得1200 MPa下30Cr Mn Si Ni2A钢试样的疲劳寿命较传统抛光下的试样增加了23.5%。
Surface microstructure and mechanical properties of samples after ultrasonic impact and traditional polishing were analyzed by means of optical microscope and X-ray diffraction,and the strengthening mechanism of ultrasonic impact on the fatigue life of 30 Cr Mn Si Ni2 A was studied. The results show that after impact,the surface microstructure becomes more dense which hinders the initiation of cracks on the surface,and the generation of higher residual compressive stress results in the decrease of the crack growth rate,it makes the fatigue life of30 Cr Mn Si Ni2 A steel increase by 23. 5% compared with the sample of traditional polishing under 1200 MPa.
出处
《金属热处理》
CAS
CSCD
北大核心
2015年第10期60-63,共4页
Heat Treatment of Metals
