As-Cast Microstructures of Low-Carbon Microalloyed Steel Produced by Twin-Roll Strip Casting

被引：0
|
作者：
Wang H.-S. [1 ]
Yuan G. [1 ]
Cao G.-M. [1 ]
Wang G.-D. [1 ]
机构：
[1] State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang
来源：
Dongbei Daxue Xuebao/Journal of Northeastern University | 2018年 / 39卷 / 04期
关键词：
Low-carbon microalloyed steel; Precipitate; Prior austenite grain; Solidification structure; Twin-roll strip casting;
D O I：
10.12068/j.issn.1005-3026.2018.04.009
中图分类号：
学科分类号：
摘要：
Low-carbon microalloyed steel was produced via twin-roll strip casting in the laboratory. The solidification structure, microstructure at room temperature, precipitate and dislocation of the as-cast strip were analyzed by OM, SEM and TEM. The results showed that the secondary dendrite arm spacing of the solidification structure is in the range of 12~15 μm, which is much finer than that of the slab produced by the traditional process. The prior austenite grain of the as-cast strip is quite coarse with a size range of 250~410 μm. The microstructure of the as-cast strip consists of Widmanstatten ferrite, pearlite and irregular ferrite. The nano-sized TiC precipitate and rod-like cementite are observed in the as-cast structure. The TiC precipitate in the as-cast strip is not obviously suppressed by the rapid solidification rate and secondary cooling rate (cooling in air) of the twin-roll strip casting. Furthermore, a large amount of dislocations in the as-cast strip are also observed, formed by rolling force among the casting rollers and nonuniform cooling rate of the second cooling process. © 2018, Editorial Department of Journal of Northeastern University. All right reserved.
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页码：497 / 500
页数：3
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