【摘要】 研究了不同强韧性匹配重载车钩材料的高周疲劳行为。通过不同热处理工艺获得的重载车钩材料25MnCrNiMoA钢三种不同强韧性匹配的试样,即:高强低韧、中强高韧和低强高韧三种组合的试样。采用旋转弯曲疲劳试验方法,测定了车钩材料的疲劳极限。绘制了p-S-N曲线,观察了疲劳断口,分析了在不同回火温度下获得的不同强韧性匹配对车钩材料高周疲劳行为的影响。结果表明,强韧性匹配对重载车钩材料的高周疲劳行为影响显著。经过处理的中强高韧强韧性匹配车钩材料具有较高的疲劳极限和寿命水平,与低周疲劳试验研究结果一致,本研究为车钩设计的选材和生产提供重要的理论依据。更多还原

【Abstract】 The high cycle fatigue behavior of heavy haul coupler materials with different strength and toughness matching properties was investigated. Three kinds of specimens made from 25 MnCrNiMoA steel with different strength-toughness matching properties, namely, high strength-low toughness, medium strengthhigh toughness and low strength-high toughness, were obtained by different heat treatment processes. The fatigue limit of the coupler materials were measured by the method of rotary bending fatigue test. The p-S-N curve was drawn, the fatigue fracture surface was observed, and the influence of different strength-toughness matching properties obtained at different tempering temperatures on the high cycle fatigue behavior of the coupler material was analyzed. The results show that the high cycle fatigue behavior of heavy haul coupler material is significantly affected by the strength-toughness matching. The medium strength-high toughness coupler material has higher fatigue limit and life level, which is consistent with the low cycle fatigue test results. This study provides an important theoretical basis for the material selection and production of coupler design.更多还原