SOLID FEEDING MECHANISM AND ITS APPLICA-TION ON CASTINGS WITH LARGE HEIGHT-TO-DIAMETER RATIO

doi:10.11900/0412.1961.2016.00075

Acta Metall Sin

2016, Vol. 52

Issue (12): 1510-1516 DOI: 10.11900/0412.1961.2016.00075

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SOLID FEEDING MECHANISM AND ITS APPLICA-TION ON CASTINGS WITH LARGE HEIGHT-TO-DIAMETER RATIO

Longfei CHEN,Yikun LUAN(

),Dianzhong LI,Yiyi LI

Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Cite this article:

Longfei CHEN,Yikun LUAN,Dianzhong LI,Yiyi LI. SOLID FEEDING MECHANISM AND ITS APPLICA-TION ON CASTINGS WITH LARGE HEIGHT-TO-DIAMETER RATIO. Acta Metall Sin, 2016, 52(12): 1510-1516.

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Abstract

Shrinkage porosity is one of major defects in castings, which seriously influences the quality of the castings. In general, the common method to eliminate this defect is to increase the liquid feeding ability of the casting through setting a riser in the corresponding position. However, for the casting with large height-to-diameter ratio, narrow and long feeding channel increases the flow resistance of the liquid metal in the late stage of the solidification. It is difficult to achieve a long-range liquid feeding, and the effect of the feeding is very little. Therefore, the penetrated shrinkage porosity in axis is frequently produced in the continuous casting ingots with large height-to-diameter ratio and large cross-section. As the liquid feeding mechanism has no effect on this problem, the solid feeding mechanism is proposed. First, the solid feeding mechanic is clarified by analyzing the effect of the hydrostatic tense stresses on the pore formation and the solid deformation. In addition, the ability of the solid feeding is determined by the value of the fracture of liquids, the content of the gas solute in liquid metal and yield strength of the solid. Then on the basis of this mechanism, reducing the temperature gradient in the radial direction of the casting is proposed to enhance the solid feeding ability. Finally, a verification experiment was conducted, and the results proved the function of the solid feeding on eliminating the shrinkage porosity defects.

Key words: casting, shrinkage porosity, solid feeding, hydrostatic tension

Received: 09 March 2016

Fund: Supported by National Natural Science Foundation of China (No.51304185)

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	Longfei CHEN
	Yikun LUAN
	Dianzhong LI
	Yiyi LI

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https://www.ams.org.cn/EN/10.11900/0412.1961.2016.00075 OR https://www.ams.org.cn/EN/Y2016/V52/I12/1510

Fig.1 Schematic of interaction between the solid deformation and the void nucleation (p_f—fracture pressure of liquid, p_t—yield pressure of the solid)

Fig.2 Schematic of mechanical model of the casting (a—radius of the solid liquid interface, b—radius of the casting, r—radius, p—tension)

Fig.3 Distributions of shrinkage porosity in the center of the castings

(a) No.1 (mould temperature is 20 ℃)

(b) No.2 (mould temperature is 300 ℃)

Fig.4 Distributions of shrinkage porosity showed by different cut-off values

(a) porosity>2% (b) porosity>1% (c) porosity>0.5%

Fig.5 Temperature difference (ΔT) vs temperature in casting core (T_m) during solidification

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