Influence of Cooling Rate on the Contraction of Peritectic Transformation During Solidification of Peritectic Steels

doi:10.11900/0412.1961.2018.00553

Acta Metall Sin

2019, Vol. 55

Issue (10): 1311-1318 DOI: 10.11900/0412.1961.2018.00553

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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

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.

Key words: peritectic transformation contraction cooling rate surface roughness peritectic steel continuous casting

Received: 19 December 2018

ZTFLH:

TF777

Fund: National Natural Science Foundation of China(U1760103)

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	Junli GUO
	Guanghua WEN
	Jiaojiao FU
	Ping TANG
	Zibing HOU
	Shaopeng GU

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https://www.ams.org.cn/EN/10.11900/0412.1961.2018.00553 OR https://www.ams.org.cn/EN/Y2019/V55/I10/1311

Fig.1 Thermal scheme used in this experiment

Fig.2 The peritectic transformation of δ to γ under the cooling rate of 2.5 ℃/s

Fig.3 Image analyses of the δ/γ propagation of region A in Fig.2a

Fig.4 Two different modes of the peritectic transformation during solidification (G.B.—grain boundary)

Fig.5 Peritectic transformation temperatures under different cooling rates (T₀-line is the thermodynamic equivalence of δ and γ)

Fig.6 Relationship between the cooling rate (dT/dt) and the undercooling (ΔT)

Fig.7 Surface morphologies under the cooling rates of 5 ℃/s (a) and 50 ℃/s (b)

Fig.8 Surface roughness (a) and the difference between maximum of roughness R_a(max) and minimum of roughness R_a(min) (φ) (b) under different cooling rates

Fig.9 Effect of the cooling rate and casting speed at the initial solidification in mold on the crack

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