【作者】 杜百平； 马宝钿； 方铭；

【Author】 DU Baiping, MA Baotian, FANG Ming Research Institute for Strangth of Metals, Xian Jiaotong University, Xian 710049, China

【机构】 西安交通大学金属材料强度研究所；

【摘要】 利用MTS880液压伺服试验机在恒应变ε=±0.5%及±0.8%控制下,对40Cr钢调质试样进行疲劳循环后,再通过间隙回火处理,结果提高了疲劳寿命。比较了恒应变量和损伤程度对其延寿效果的影响。通过透射电镜对其亚结构和位错形态的观察,讨论了间隙回火对损伤亚结构的影响和对延缓微裂纹扩展延寿的微观机理。更多还原

【Abstract】 The specimens of refined 40Cr steel were fatigued in low cycle by MTS electro-hydraulic servo machine in the condition of strain ε=±0.5% and ±0.8%, followed by interval tempering. The prolonging of fatigue life was obtained. The effect of the prolonging of fatigue life was compared in the constant strain amplitude and damage degree. The substructure and dislocation morphology was analyzed by TEM. The micro-machanisms were discussed of the influence of interval tempering on both damaging substructure and delaying micro-crack propagation.更多还原