摘要
采用热轧双相钢DP600制成的乘用车轮在进行动态弯曲疲劳试验时开裂。利用光学电镜和扫描电镜观察了疲劳裂纹的扩展过程，并分析了夹杂物、显微组织和表面质量对裂纹扩展的影响。试验结果表明，开裂主要原因为检测过程中车轮表面与疲劳检测设备之间的微动磨损引起表面应力集中，形成裂纹源；其次，混晶组织和较差的表面质量也是导致开裂的原因；不能确定夹杂物对开裂的影响。
Cracks were found during the dynamic bending fatigue test of passenger car wheels which were produced with hot rolled dual phase steel DP600. The crack growth process was observed by means of optical microscope and scanning electron microscope, and the effect of inclusion, microstructure and surface quahty on crack growth was analyzed. The results showed that stress concentration caused by fretting wear between the wheel surface and the test equipment in the course of testing was the main cause of cracking. Mixed grain structure and poor surface quality were also the causes of cracking. The effect of inclusion on the cracking could not be determined.
出处
《首钢科技》
2017年第1期17-22,共6页
Shougang Science and Technology
关键词
双相钢
裂纹扩展
弯曲疲劳试验
混晶
表面质量
dual phase steel, crack growth, bending fatigue test, mixed grain, surface quality
