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材料工程  2016, Vol. 44 Issue (2): 35-42    DOI: 10.11868/j.issn.1001-4381.2016.02.006
  材料与工艺 本期目录 | 过刊浏览 | 高级检索 |
卷取温度对高Nb微合金钢组织、力学性能及第二相析出的影响
王小江1,2, 孙新军2, 李昭东2, 张正延2, 雍岐龙1,2, 李员妹1,2
1. 昆明理工大学 材料科学与工程学院, 昆明 650093;
2. 钢铁研究总院 工程用钢研究所, 北京 100081
Effect of Coiling Temperature on Microstructure, Mechanical Properties and Second Phase Precipitation Behavior of High Nb Microalloying Steel
WANG Xiao-jiang1,2, SUN Xin-jun2, LI Zhao-dong2, ZHANG Zheng-yan2, YONG Qi-long1,2, LI Yuan-mei1,2
1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China;
2. Department of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, China
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摘要 采用扫描电镜(SEM)、力学性能测试试验机和透射电镜(TEM)对一种高Nb微合金钢在400,450℃和500℃不同卷取温度下的组织、力学性能和第二相析出行为进行研究。结果表明:随着卷取温度的降低,卷取过程中过冷奥氏体转变所得贝氏体组织分别为粒状贝氏体(GB)、板条贝氏体铁素体(BF)+GB和板条BF。不同卷取温度下的实验钢析出的第二相主要为(Nb,Mo)C在位错线上的随机析出,部分区域观察到不同程度的相间析出。随着卷取温度的降低,(Nb,Mo)C析出量减少,粒子平均尺寸增大。随着卷取温度的升高,抗拉强度和屈服强度提高,低温冲击韧性下降。强度提高是由于尺寸小于10nm的(Nb,Mo)C大量析出产生的析出强化。
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王小江
孙新军
李昭东
张正延
雍岐龙
李员妹
关键词 卷取温度组织强度析出相    
Abstract:The microstructure, mechanical properties and second phase precipitation behavior of a high Nb microalloying steel at different coiling temperatures of 400, 450℃ and 500℃ were investigated by scanning electron microscope, experimental machine of mechanical property testing and transmission electron microscope. The results show that, with the decrease of the coiling temperature, during the coiling process, the bainite microstructures transformed from super-cooled austenite are granular bainite, lath bainitic ferrite plus granular bainite, and lath bainitic ferrite, respectively. At different coiling temperatures, the second phase precipitates from the experimental steel are mainly(Nb, Mo) C which randomly precipitate on dislocation lines, and interphase precipitates are observed in some areas. As the coiling temperature decreases, the precipitation decreases, the average particle size increases. With the increase of the coiling temperature, the tensile strength and yield strength are improved, while the low temperature impact toughness decreases. The strength being improved is due to the precipitation strengthening as with a large number of(Nb, Mo) C particles with size less than 10nm.
Key wordscoiling temperature    microstructure    strength    precipitated phase
收稿日期: 2014-12-03      出版日期: 2016-02-22
中图分类号:  TG142.1  
通讯作者: 雍岐龙(1953-),男,教授,现从事含铌钢的研究与开发工作,联系地址:北京市海淀区学院南路76号钢铁研究总院南院工程用钢研究所(100081),E-mail:yongql@126.com     E-mail: yongql@126.com
引用本文:   
王小江, 孙新军, 李昭东, 张正延, 雍岐龙, 李员妹. 卷取温度对高Nb微合金钢组织、力学性能及第二相析出的影响[J]. 材料工程, 2016, 44(2): 35-42.
WANG Xiao-jiang, SUN Xin-jun, LI Zhao-dong, ZHANG Zheng-yan, YONG Qi-long, LI Yuan-mei. Effect of Coiling Temperature on Microstructure, Mechanical Properties and Second Phase Precipitation Behavior of High Nb Microalloying Steel. Journal of Materials Engineering, 2016, 44(2): 35-42.
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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.02.006      或      http://jme.biam.ac.cn/CN/Y2016/V44/I2/35
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