摘要
通过对新型低碳低硅相变塑性钢(TRIP钢)的低周疲劳和裂纹扩展试验,得到试验TRIP钢循环应变硬化系数n’为0.1891,循环强度系数K’为1551MPa;疲劳强度指数b为-0.1123,疲劳强度系数fσ’为1266MPa;疲劳延性指数c为-0.5918,疲劳延性系数fε’为0.3374。裂纹扩展门槛值ΔKth为229MPa(mm)1/2,具有良好的疲劳性能。用试验得到的疲劳特性参数进行了相关零件的结构和疲劳仿真分析,指导汽车零件的设计。预测认为轻量化结构设计是合理的,轻量化后零件的疲劳台架试验结果也验证了预测的正确。
The low cycle fatigue properties and the criteria value of crack propagation for low carbon low silicon TRIP steels were investigated. Low cycle fatigue test showed n＇ = 0. 1891, K＇ = 1551MPa, and △εf/2 = 1266/（2.05 ＊ 10^5） （2Nf）^-0.1123 ＋ 0.3374 （2Nf）^-0.5918. The criteria value of crack propagation △Kth was 229MPa （mm）^1/2. The results showed good fatigue properties of this TRIP steel. The structural analysis and CAE simulation of the automotive parts obtained with parameters of tested fatigue property was performed to direct the parts design. It was predicted that the light weight design was reasonable, and the result of fatigue test confirmed the prediction.
出处
《上海金属》
CAS
2009年第1期6-9,共4页
Shanghai Metals
