Effect of casting speed on dendrite arm spacing of Mn13 steel continuous casting slab
- PDF / 2,312,856 Bytes
- 8 Pages / 595.276 x 790.866 pts Page_size
- 51 Downloads / 226 Views
ORIGINAL PAPER
Effect of casting speed on dendrite arm spacing of Mn13 steel continuous casting slab Jian‑min Li1,2,3 · Mao‑fa Jiang1,3 · Jun‑xiang Ning1,3 · Jun Zhai2 Received: 29 April 2019 / Revised: 18 July 2019 / Accepted: 18 July 2019 © China Iron and Steel Research Institute Group 2020
Abstract The dendrite arm spacing in the continuous casting slab of Mn13 steel under different casting speeds was measured using the metallographic microscope. Meanwhile, a heat transfer model was established by the Pro-cast software. The relationship between the dendrite arm spacing and casting speed in continuous casting slab of Mn13 steel was studied and described by a function expression. The results provide an important theoretical basis for the development and optimization of continuous casting production process of high-manganese steel and help to improve the quality of continuous casting slab of high-manganese steel. Under the experimental conditions, the suitable casting speed is about 0.9 m/min. The secondary dendrite spacing maintains a relatively stable low-amplitude increase trend, and it is beneficial to obtain a higher proportion of equiaxed crystals. Keywords High-manganese steel · Dendrite arm spacing · Continuous casting · Casting speed
1 Introduction Due to the good impact toughness and work-hardening property, high-manganese steel is widely used in metallurgy, mining, building, railways, and military. At present, metallurgists have carried out relevant basic research on the control of inclusions in high-manganese steels [1], mathematical simulation of the solidification characteristics of high-manganese steels [2], and the correlation and control of the structure and mechanical properties of high-manganese steels [3]. However, the continuous casting production of high-manganese steel is difficult to achieve because of its special properties, such as high alloy content, strong thermal sensitivity, wide two-phase field, and slow solidification process [4–8]. Unreasonable process parameters in related continuous casting process can easily lead to the formation of * Jun Zhai [email protected] 1
Key Laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education), Northeastern University, Shenyang 110819, Liaoning, China
2
Shanxi Taigang Stainless Steel Co., Ltd., Taiyuan 030003, Shanxi, China
3
School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China
large dendrite in the continuous casting slab and the composition segregation between dendrites, which will deteriorate the quality of the continuous casting slab. The dendrite arm spacing, which directly affects the composition segregation, is an important characteristic of the directional solidification structure, and it is highly dependent on the continuous casting process, such as the cooling water intensity and casting speed. It was found that the dendrite arm spacing of high-carbon steel slab showed an increased tendency with the decrease in secondary cooling water intensity and the increase in superh
Data Loading...
