Effect of coiling temperature on microstructure, mechanical properties and second phase precipitation behavior of high Nb microalloying steel

被引：0
|
作者：
Wang X.-J. [1 ,2 ]
Sun X.-J. [2 ]
Li Z.-D. [2 ]
Zhang Z.-Y. [2 ]
Yong Q.-L. [1 ,2 ]
Li Y.-M. [1 ,2 ]
机构：
[1] Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming
[2] Department of Structural Steels, Central Iron and Steel Research Institute, Beijing
来源：
Yong, Qi-Long (yongql@126.com) | 1600年 / Beijing Institute of Aeronautical Materials (BIAM)卷 / 44期
关键词：
Coiling temperature; Microstructure; Precipitated phase; Strength;
D O I：
10.11868/j.issn.1001-4381.2016.02.006
中图分类号：
学科分类号：
摘要：
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 10 nm. © 2016, Beijing Institute of Aeronautical Materials (BIAM). All right reserved.
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页码：35 / 42
页数：7
相关论文
共 29 条
  • [1] Fu J.Y., Development history of Nb-microalloying technology and progress of Nb-microalloyed steels, Iron and Steel, 40, 8, pp. 1-6, (2006)
  • [2] Tiitto K., Fitzsimons G., Deardo A.J., The effect of dynamic precipitation and recrystallization on the hot flow behavior of a Nb-V microalloyed steel, Acta Metall, 31, 8, pp. 1159-1168, (1983)
  • [3] Yong Q.L., Ma M.T., Wu B.R., Microalloyed Steel: Physical and Mechanical Metallurgy, (1989)
  • [4] Hulka K., Bordignon P., Gray J.M., Experience with low carbon HSLA steel containing 0.06-0.10 percent niobium, Araxá: Companhia Brasileira de Metalurgia e Mineração, 23, 6, pp. 30-40, (2003)
  • [5] Yoo J.Y., Ahn S.S., Seo D.H., Et al., New development of high grade X80 to X120 pipeline steels, Materials and Manufacturing Processes, 26, 1, pp. 154-160, (2011)
  • [6] Yoneguchi A., Schaad J., Kurebayashi Y., Et al., Development of new high strength spring steel and its application to automotive coil spring, 1, pp. 98-105, (2000)
  • [7] Fu J.Y., Meng F.M., Technology and development of niobium steel in automobile industry, Automobile Technology & Material, 6, pp. 4-20, (2004)
  • [8] Wang W., Gu H.R., Influence of coiling temperature on precipitate and property of X80 pipeline steel, Materials and Metallurgy, 9, 3, pp. 207-210, (2010)
  • [9] Wen J.H., Liu Q.Y., Sun X.J., Et al., Influence of cooling rate on microstructures of high-Nb microalloyed steel, Journal of Iron and Steel Research, 19, 12, pp. 35-39, (2008)
  • [10] Jiao D.T., Cai Q.W., Wu H.B., Effects of cooling process after rolling on microstructure and yield ratio of high-strain pipeline steel X80, Acta Metallurgica Sinica, 45, 9, pp. 1111-1116, (2009)
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