| 回火对微合金管线钢疲劳裂纹扩展行为的影响 |
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| 引用本文： | 李红英,宾杰,林武,魏冬冬,李阳华,曹俊.回火对微合金管线钢疲劳裂纹扩展行为的影响[J].中南大学学报(自然科学版),2011(9). |
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| 作者姓名： | 李红英 宾杰 林武 魏冬冬 李阳华 曹俊 |
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| 作者单位： | 中南大学材料科学与工程学院; |
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| 基金项目： | 湖南省自然科学基金资助项目(05JJ30200) |
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| 摘 要： | 采用MTS858电液伺服万能试验机、扫描电镜及透射电镜研究回火对一种高强度微合金管线钢疲劳裂纹扩展行为的影响。研究结果表明:回火可提高微合金管线钢疲劳裂纹扩展的门槛值,降低疲劳裂纹扩展速率,但对裂纹扩展稳态区的扩展速率影响不大;回火使碳氮化物沉淀析出、晶间马氏体/奥氏体(M/A)组元由岛状转变为点状及细条状,形成马氏体薄膜结构,阻碍变形和裂纹在材料中扩展,增加裂纹的偏折程度;在控轧控冷终冷温度进行2～4 h回火热处理,可以提高微合金管线钢强韧性和抗疲劳裂纹扩展能力。
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| 关 键 词： | 回火 微合金管线钢 针状铁素体 疲劳 裂纹扩展行为 |
Effects of tempering treatment on fatigue crack propagation behavior of microalloyed pipeline steels |
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| LI Hong-ying,BIN Jie,LIN Wu,WEI Dong-dong,LI Yang-hua,CAO Jun.Effects of tempering treatment on fatigue crack propagation behavior of microalloyed pipeline steels[J].Journal of Central South University:Science and Technology,2011(9). |
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| Authors: | LI Hong-ying BIN Jie LIN Wu WEI Dong-dong LI Yang-hua CAO Jun |
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| Institution: | LI Hong-ying,BIN Jie,LIN Wu,WEI Dong-dong,LI Yang-hua,CAO Jun (School of Materials Science and Engineering,Central South University,Changsha 410083,China) |
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| Abstract: | The effects of different tempering treatments on fatigue crack propagation behavior of a high strength microalloyed pipeline steel were investigated by MTS858 material testing system,scanning electron microscopy and transmission electron microscopy.The results show that tempering treatments can improve the fatigue crack propagation threshold and reduce the fatigue crack growth rate of microalloyed pipeline steels,but with little effects on the intermediate region of stable crack propagation.Tempering treatm... |
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| Keywords: | tempering microalloyed pipeline steel acicular ferrite fatigue crack propagation behavior |
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