【摘 要】
：
采用疲劳性能测试方法研究了应变控制下国产P92钢室温和600℃高温下的低周疲劳性能,并采用扫描电子显微镜对疲劳试样断口形貌进行了观察.结果表明:国产P92钢具有循环软化特征
【机 构】
：
同济大学材料科学与工程学院,上海市金属功能材料开发应用重点实验室,上海材料研究所 上海市工程材料应用评价重点实验室,
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采用疲劳性能测试方法研究了应变控制下国产P92钢室温和600℃高温下的低周疲劳性能,并采用扫描电子显微镜对疲劳试样断口形貌进行了观察.结果表明:国产P92钢具有循环软化特征,应变幅和温度的提高是造成材料单轴疲劳寿命降低的主要原因;2种温度下疲劳裂纹均起源于表面,裂纹扩展为条纹机制;高温下具有较低的疲劳寿命是与氧化损伤、裂纹萌生扩展速率和材料的塑性变形密切相关的.
The fatigue performance test was used to study the low cycle fatigue behavior of domestic P92 steel under room temperature and high temperature of 600 ℃, and the fracture surface appearance of the fatigue specimen was observed by scanning electron microscope.The results show that the domestic P92 steel has the characteristics of cyclic softening The characteristics, strain amplitude and temperature increase are the main reasons that lead to the decrease of the fatigue life of uniaxial materials. The fatigue cracks originate from the surface at both temperatures, and the crack propagates as stripe mechanism. The fatigue life at high temperature is related to oxidative damage, Crack initiation rate of expansion is closely related to the plastic deformation of the material.
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