| 双相区加速冷却处理对X80管线钢组织与性能的影响 |
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| 引用本文： | 马静,于柏青,王申豪,范利锋.双相区加速冷却处理对X80管线钢组织与性能的影响[J].金属热处理,2020,45(3):140-145. |
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| 作者姓名： | 马静 于柏青 王申豪 范利锋 |
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| 作者单位： | 1. 河北科技大学 材料科学与工程学院, 河北 石家庄 050018;
2. 河北省材料近净成形技术重点实验室, 河北 石家庄 050018;
3. 内蒙古大学 交通学院, 内蒙古 呼和浩特 010070 |
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| 摘 要： | 采用双相区加速冷却法(加速冷却始冷温度为700 ℃)对X80管线钢进行热处理,获得了贝氏体和铁素体(B+F)双相组织。然后通过组织表征、力学性能测试以及在3.5wt%NaCl溶液中的耐蚀性进行研究。结果表明:热处理后获得的管线钢组织由板条状贝氏体、多边形铁素体及少量马氏体/奥氏体岛组成。与热处理前相比,(B+F)双相管线钢屈强比较低,为0.65,初始加工硬化指数为0.31,均匀伸长率达8.3%,塑性显著提升;双相组织中含有52.4%的铁素体,因而耐腐蚀性明显提高。通过双相区加速冷却法获得的(B+F)两相组织在塑变过程中发生协调变形,可以适应大变形的需求,同时耐蚀性优异,为大变形管线钢实际生产提供一定的借鉴。
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| 关 键 词： | 双相区加速冷却法 X80管线钢 B+F双相组织 大变形 均匀伸长率 |
| 收稿时间： | 2019-09-26 |
Effect of dual phase accelerated cooling on microstructure and properties of X80 pipeline steel |
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| Ma Jing,Yu Baiqing,Wang Shenhao,Fan Lifeng.Effect of dual phase accelerated cooling on microstructure and properties of X80 pipeline steel[J].Heat Treatment of Metals,2020,45(3):140-145. |
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| Authors: | Ma Jing Yu Baiqing Wang Shenhao Fan Lifeng |
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| Affiliation: | 1. School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang Hebei 050018, China;
2. Hebei Key Laboratory of Material Near-Net Forming Technology, Shijiazhuang Hebei 050018, China;
3. School of Transportation, Inner Mongolia University, Hohhot Inner Mongolia 010070, China |
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| Abstract: | X80 pipeline steel was heat treated by using dual phase accelerated cooling(the initial cooling temperature of the accelerated cooling was 700℃),and dual-phase structure of bainite and ferrite(B+F)was obtained.Microstructure characterization,mechanical properties test and corrosion resistance in 3.5 wt%Na Cl solution were studied.The results show that the microstructure of pipeline steel after heat treatment is composed of lath bainite,polygonal ferrite and a small amount of martensite/austenite islands.The yield ratio and initial work hardening index of(B+F)dual-phase pipeline steel are 0.65 and 0.31,respectively.Compared with that of steel before heat treatment,the uniform elongation of pipeline steel after heat treatment is 8.3%,which indicates that the ductility is significantly improved.The corrosion resistance is also improved due to 52.4%amount of ferrite phase in the dual-phase structure.The coordinated deformation of(B+F)dual-phase structure obtained by dual-phase accelerated cooling during plastic deformation process can meet the needs of high deformation,and the corrosion resistance of the dual-phase structure is excellent,which provides some reference for the actual production of high deformation pipeline steel. |
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| Keywords: | dual-phase accelerated cooling X80 pipeline steel B+F dual-phase structure high deformation uniform elongation |
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