汽车用SPHC热轧薄钢板的低周疲劳特性
Low Cycle Fatigue Characteristics of SPHC Hot-rolled Steel Sheet for Automobile
摘 要
对2.0 mm厚汽车用SPHC热轧薄钢板进行低周循环应变疲劳试验，获得了应力-应变曲线、应变-寿命曲线、应变滞回环曲线以及相关疲劳常数指标，并对疲劳断口形貌进行观察。结果表明：SPHC钢在试验范围内具有非Masing效应；拟合得到SPHC钢的循环强度系数为284，循环应变硬化指数为0.128；通过Manson-Coffin方程拟合得到SPHC钢的疲劳强度系数为467 MPa，疲劳强度指数为-0.078，疲劳延性系数为0.323，疲劳延性指数为-0.609；疲劳断口由裂纹源区、裂纹扩展区、瞬断区组成，裂纹扩展区由大量疲劳辉纹组成，瞬断区存在大量韧窝，SPHC钢具有良好的塑韧性。
低周疲劳特性
应变控制
疲劳断口
SPHC steel
low cycle fatigue characteristic
strain control
fatigue fracture
Abstract
Low cycle cyclic strain fatigue test was carried out on 2.0 mm thick SPHC hot-rolled steel sheet for automobile, and the stress-strain curve, strain-life curve, strain hysteresis loop curve and related fatigue constant indicators were obtained. The fatigue fracture morphology was observed. The results show that the SPHC steel had a non-Masing effect within the test range. The fitted cyclic strength coefficient of SPHC steel was 284, and cyclic strain-hardening exponent was 0.128. The fatigue strength coefficient was 467 MPa, the fatigue strength index was -0.078, the fatigue ductility coefficient was 0.323, and the fatigue ductility index was -0.609 fitted by Manson-Coffin equation. The fatigue fracture included crack source area, crack propagation area, and transient fracture area. The crack propagation area was composed of a large number of fatigue striation, and the transient fracture area consisted of a large number of dimples. SPHC steel had good ductility.
中图分类号 TG142 DOI 10.11973/jxgccl202104011
所属栏目 材料性能及应用
基金项目 河钢集团重点科技项目（HG2018215）
收稿日期 2020/3/25
修改稿日期 2021/2/3
网络出版日期
作者单位点击查看
备注孙晓冉(1983-),女,河北衡水人,高级工程师,硕士
引用该论文: SUN Xiaoran,SONG Yue,GU Xiurui,BAI Lijuan,ZHAO Xiujuan. Low Cycle Fatigue Characteristics of SPHC Hot-rolled Steel Sheet for Automobile[J]. Materials for mechancial engineering, 2021, 45(4): 57～60
孙晓冉,宋月,谷秀锐,白丽娟,赵秀娟. 汽车用SPHC热轧薄钢板的低周疲劳特性[J]. 机械工程材料, 2021, 45(4): 57～60
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参考文献
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