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Influence of Cooling Rate on the Contraction of Peritectic Transformation During Solidification of Peritectic Steels |
GUO Junli,WEN Guanghua(),FU Jiaojiao,TANG Ping,HOU Zibing,GU Shaopeng |
SCollege of Materials Science and Engineering, Chongqing University, Chongqing 400044, China |
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Cite this article:
GUO Junli, WEN Guanghua, FU Jiaojiao, TANG Ping, HOU Zibing, GU Shaopeng. Influence of Cooling Rate on the Contraction of Peritectic Transformation During Solidification of Peritectic Steels. Acta Metall Sin, 2019, 55(10): 1311-1318.
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Abstract Driven by the demand for the improving mechanical properties of steel products and the cost reduction in alloys, steels falling within the peritectic composition range are designed recently. However, notoriously cast surface defects such as cracks, deep oscillation mark formation and breakouts are found to occur frequently during continuous casting of steels, particularly at high casting speeds. This phenomenon is closely related to the shrinkage of phase transformation caused by the peritectic transformation. In order to understand the effects of cooling rate on the contraction of the peritectic transformation, the initial solidification processes of a peritectic steel (Fe-0.1C-0.21Si-1.2Mn, mass fraction, %) were observed using high-temperature confocal laser scanning microscopy under different cooling rates, and then variations in surface roughness were measured to reflect the degree of peritectic transformation contraction. The results show that the peritectic transformation occurs a massive transformation when the cooling rate exceeds the critical value. The massive transformation results in a sudden peritectic transformation contraction and surface roughness variations, which directly cause the occurrence of surface longitudinal cracks of slabs at high casting speeds. The contraction increases first and then decreases with the cooling rate increasing and the maximum surface roughness at the middle cooling rate (20 ℃/s) is about 2.8 times more extensive than that which occurs at the low cooling rate of 2.5 ℃/s. The phenomenon that the peritectic transformation contraction decreases under the high cooling rate may provide a new strategy to reduce cracks occurring in high speed casting.
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Received: 19 December 2018
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Fund: National Natural Science Foundation of China(U1760103) |
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