| 淬火微观组织对重轨钢疲劳裂纹扩展速率的影响 |
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| 引用本文： | 陈林,王慧军,郭飞翔.淬火微观组织对重轨钢疲劳裂纹扩展速率的影响[J].材料导报,2017,31(14):109-112. |
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| 作者姓名： | 陈林 王慧军 郭飞翔 |
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| 作者单位： | 内蒙古科技大学材料与冶金学院,包头,014010 |
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| 基金项目： | 国家自然科学基金(51361021);内蒙古自然科学基金(2017MS0511);包头市科技计划项目(2015Z2010-2) |
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| 摘 要： | 以U75V重轨钢CT(Compaction test)试样为研究对象,分别研究了冷速为3℃/s、5℃/s及空冷轧态的组织对稳定区(疲劳扩展Ⅱ区)疲劳裂纹扩展速率的影响,疲劳试验在高频共振疲劳试验机上进行。研究结果表明:疲劳裂纹扩展速率随着珠光体片层间距的减小而降低,冷速由大到小(5℃/s、3℃/s、空冷)所对应的n值分别为3.603 05、3.631 18和3.885 28;珠光体组织的疲劳裂纹断裂形式主要以穿晶断裂为主,同时伴随部分沿晶断裂;片层间距影响裂纹扩展路径的偏折程度,偏折程度随片层间距的减小而增大,增大的裂纹偏折路径对裂纹扩展的阻碍作用增强,有利于疲劳裂纹扩展速率的降低。
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| 关 键 词： | 重轨钢 淬火组织 高频疲劳 裂纹扩展速率 裂纹扩展路径 |
Effect of Quenching Microstructure on Fatigue Crack Growth Rate of Heavy Rail Steel |
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| CHEN Lin,WANG Huijun and GUO Feixiang.Effect of Quenching Microstructure on Fatigue Crack Growth Rate of Heavy Rail Steel[J].Materials Review,2017,31(14):109-112. |
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| Authors: | CHEN Lin WANG Huijun and GUO Feixiang |
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| Affiliation: | School of Materials & Metallurgy, Inner Mongolia University of Science &Technology, Baotou 014010,School of Materials & Metallurgy, Inner Mongolia University of Science &Technology, Baotou 014010 and School of Materials & Metallurgy, Inner Mongolia University of Science &Technology, Baotou 014010 |
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| Abstract: | Fatigue tests were conducted for standard compact tension specimens of U75V heavy rail steel via a high-frequency resonance fatigue testing machine, in order to study the influence of the rolled state′s microstructure under different cooling rates (3 ℃/s, 5 ℃/s, and air cooling) upon the crack growth rate of the stable zone (fatigue crack growth zone Ⅱ).The results show that the fatigue crack growth rate decreases with the decline of pearlite lamellar spacing.The 5 ℃/s, 3 ℃/s, and air cooling correspond to n values of 3.603 05, 3.631 18 and 3.885 28, respectively.Fracture modes of the fatigue cracks of pearlite microstructure are mainly transgranular fracture, accompanied by partial intergranular fracture.Lamellar spacing affects the deflection of the crack propagation path, and increased the degree of crack deflection subsequently enhances crack propagation impediment, which benefits the reduce of the fatigue crack growth rate. |
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| Keywords: | heavy rail steel quenching microstructure high frequency fatigue crack growth rate crack propagation path |
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