Cr-Mn钢的室温旋转弯曲疲劳性能  

ROTARY BENDING FATIGUE PROPERTIES OF Cr-Mn STEEL AT ROOM TEMPERATURE

作　　者：王程明 孙晓冉 相楠 赵中昱 孙岩 崔少璞 Wang Chengming;Sun Xiaoran;Xiang Nan;Zhao Zhongyu;Sun Yan;Cui Shaopu(HBIS Group Technology Research Institute, Shijiazhuang, Hebei, 050023)

机构地区：[1]河钢集团钢研总院理化检测中心,河北石家庄050023 [2]河钢集团钢研总院,河北石家庄050023

出　　处：《河北冶金》2021年第3期25-27,65,共4页Hebei Metallurgy

摘　　要：以Cr-Mn弹簧钢为研究对象,采用QBWP-6000J型简支梁旋转弯曲疲劳试验机,对试验材料在室温下进行了旋转弯曲疲劳试验。通过升降法测得疲劳极限,并绘制S-N曲线和P-S-N曲线;使用扫描电镜对疲劳试样断口进行观察,分析了起裂源类型和裂纹扩展行为。结果表明,试验钢旋转弯曲疲劳的疲劳极限为587 MPa,试验钢疲劳断裂起源于试样表面机加工缺陷和非金属夹杂物,非金属夹杂物主要为Al2O3夹杂物。The rotating bending fatigue test at room temperature of Cr-Mn steel was carried out with the QBWP-6000J rotating bending fatigue test machine.The fatigue limit was measured by the up-down method,and the S-N curve and P-S-N curve were drawled.The fracture of the fatigue specimen was observed by SEM,and the crack initiation source type and crack propagation behavior were analyzed.The results show that the fatigue limit of the rotational bending fatigue of test steel is 587 MPa.The fatigue fracture originates from machining defects on the sample surface and non-metallic inclusions,which are mainly Al2O3 inclusions.

关 键 词：弹簧钢 旋转弯曲疲劳试验 疲劳极限 S-N曲线 断口 

分 类 号：TG161[金属学及工艺—热处理]