| 微合金元素对X70管线钢韧性的影响 |
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| 引用本文： | 李红英,胡继东,李阳华.微合金元素对X70管线钢韧性的影响[J].材料热处理学报,2012,33(1):122-127. |
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| 作者姓名： | 李红英 胡继东 李阳华 |
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| 作者单位： | 1. 中南大学材料科学与工程学院,湖南长沙,410083
2. 中南大学材料科学与工程学院,湖南长沙410083／衡阳华菱钢管有限公司,湖南衡阳421001 |
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| 摘 要： | 研究了4种含不同微合金元素的X70管线钢的韧性,采用夏比冲击试验和落锤撕裂试验,借助金相显微镜(OM)、扫描电镜(SEM)与背散射电子衍射技术(EBSD)等手段,分析了微观组织、晶粒尺寸、晶粒取向及取向差和夹杂物等因素对X70管线钢韧性的影响。结果表明,含Mo、Ni元素的管线钢夏比冲击韧性和落锤性能都较好,含Cr元素的管线钢落锤性能偏低,大角度晶界比率越高,晶粒尺寸越细小,夹杂物含量越少的管线钢具有更高的韧性。
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| 关 键 词： | X70管线钢 韧性 EBSD 晶粒尺寸 夹杂物 |
Effect of alloy elements on toughness of X70 pipeline steels |
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| LI Hong-ying,HU Ji-dong,LI Yang-hua.Effect of alloy elements on toughness of X70 pipeline steels[J].Transactions of Materials and Heat Treatment,2012,33(1):122-127. |
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| Authors: | LI Hong-ying HU Ji-dong LI Yang-hua |
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| Affiliation: | 1,2(1.School of Materials Science and Engineering,Central South University,Hunan,Changsha 410083,China; 2.Hengyang Valin Steel Tube Group Co Ltd,Hengyang 421001,China) |
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| Abstract: | Toughness of four X70 pipeline steels with different composition was studied by using charpy impact test and drop-weight tear test(DWTT).The effects of microstructure,grain size,grain orientation and misorientation angle distribution,and inclusions on toughness of the steels were analysed by means of optical microscope(OM),scanning electrical microcopy(SEM)and the electron backscatter diffraction technique(EBSD).The results show that the charpy impact toughness and DWTT values of the pipeline steels containing Mo and Ni are higher,the DWTT values of pipeline steels containing Cr are unqualified.The toughness of X70 pipeline steels increases with higher ratio of large angle grain boundaries,less inclusions and finer effective grain size. |
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| Keywords: | X7O pipeline steel toughness EBSD grain size inclusions |
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