汽车稳定杆用55Cr3弹簧钢的低周疲劳性能  

Low cycle fatigue properties of 55Cr3 spring steel for automotive stabilizer bars

作　　者：尹德福 汪开忠[1] 龚梦强 丁雷 张晓瑞[1] YIN Defu;WANG Kaizhong;GONG Mengqiang;DING Lei;ZHANG Xiaorui(Technology Center,Maanshan Iron&Steel Co.,Ltd.,Ma′anshan 243000,China)

机构地区：[1]马鞍山钢铁股份有限公司技术中心,安徽马鞍山243000

出　　处：《物理测试》2022年第1期6-9,共4页Physics Examination and Testing

摘　　要：从汽车稳定杆用钢的实际应用需求出发,采用轴向应变控制方法,应变循环比R为-1,试验频率为0.1~1.0 Hz,疲劳试验加载波形为三角波,轴向总应变幅范围设定为0.35%~1.2%,测试了55Cr3弹簧钢低周疲劳性能,并对试验数据进行拟合计算,得到55Cr3弹簧钢的循环应力-应变曲线、应变-寿命曲线和过渡疲劳寿命;通过拟合Basquin和Coffin-Manson公式,获得了55Cr3弹簧钢的低周疲劳寿命预测公式,拟合R^(2)值大于0.9。通过疲劳断口分析,55Cr3弹簧钢断裂起源于试样表面,且存在多处裂纹源,裂纹共同向内扩展,最后快速断裂。In order to meet the demand of practical application of steel for automobile stabilizer bar,the low cycle fatigue properties of 55 Cr3 spring steel were tested with axial strain control method under the following conditions:the stress cycle ratio(R) was-1;the test frequency was in range of 0.1-1.0 Hz;the loading waveform for fatigue test was a triangular wave;the total axial strain range was set to 0.35%-1.2%.The test data were calculated and fitted to obtain the cycle stress-strain curve,strain-life curve and transitional fatigue life of 55 Cr3 spring steel.The formula for predicting the low cycle fatigue life of 55 Cr3 spring steel was obtained through fitting the Basquin and Coffin-Manson equations,and the R^(2) value in fitting was higher than 0.9.The fatigue fracture analysis indicated that the cracking of 55 Cr3 spring steel originated from the surface of the sample.There were many sources of cracks,which were then propagated inward together until ultimate fracture.

关 键 词：55Cr3弹簧钢 低周疲劳 疲劳寿命 裂纹 

分 类 号：U465.11[一般工业技术—材料科学与工程] TG142.41[机械工程—车辆工程]