Initial solidification dynamics of spreading droplets

A mathematical model coupled with electromagnetic field has been developed to simulate the transient turbulence flow and initial solidification in a slab continuous casting mold under different electromagnetic stirring (EMS) currents and casting speeds. Through comparing the magnetic flux density, flow field with measured results, the reliability of the mathematical model is proved. The uniform index of solidified shell thickness has been introduced to judge the uniformity of the solidified shell. The results show that a horizonal recirculation flow has been generated when EMS is applied, and either accelerated or decelerated regions of flow field are formed in the liquid pool. Large EMS current and low casting speed may cause the plug flow near the mold narrow face and a suitable EMS current can benefit to the uniform growth of solidified shell. Meanwhile, an industrial test exhibits that EMS can weaken the level fluctuation and number density of inclusion. Overall, a rational EMS current range is gained, when the casting speed is 1.2 m/min, the rational EMS current is 500–600 A.

Download Full-text

The Effect of Temperature Fluctuation on the Formation of Billet Surface Defect in the Initial Solidification Area

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.148-149.163 ◽

2010 ◽

Vol 148-149 ◽

pp. 163-167

Author(s):

Xiao Li Jin ◽

Zuo Sheng Lei ◽

Kang Deng ◽

Zhong Ming Ren

Keyword(s):

Continuous Casting ◽

Temperature Fluctuation ◽

Surface Defects ◽

Casting Process ◽

Effect Of Temperature ◽

Billet Surface ◽

Maximum Value ◽

Key Factor ◽

Oscillation Marks ◽

Initial Solidification

The heat transfer in steel continuous casting process under mold oscillation was calculated, and temperature fluctuation phenomena was found in the initial solidification area, the maximum value was approximate 16 °C. The effect of different continuous casting parameters on temperature fluctuation were analyzed, and the temperature fluctuation was considered to be a key factor to the formation of oscillation marks. The Index of Temperature Fluctuation(ITF) was proposed to predict the effect of temperature fluctuation on the formation of billet surface defects.

Download Full-text

A Study for Initial Solidification of Sn-Pb Alloy During Continuous Casting: Part II. Effects of Casting Parameters on Initial Solidification and Shell Surface

Metallurgical and Materials Transactions B ◽

10.1007/s11663-014-0058-3 ◽

2014 ◽

Vol 45 (3) ◽

pp. 1048-1056 ◽

Cited By ~ 15

Author(s):

Dong Zhou ◽

Wanlin Wang ◽

Haihui Zhang ◽

Fanjun Ma ◽

Ken Chen ◽

...

Keyword(s):

Continuous Casting ◽

Shell Surface ◽

Initial Solidification

Download Full-text

Study of the Effect of Carbon on the Contraction of Hypo-Peritectic Steels during Initial Solidification by Surface Roughness

Metals ◽

10.3390/met8120982 ◽

2018 ◽

Vol 8 (12) ◽

pp. 982 ◽

Cited By ~ 1

Author(s):

Dazhi Pu ◽

Guanghua Wen ◽

Dachao Fu ◽

Ping Tang ◽

Junli Guo

Keyword(s):

Surface Roughness ◽

Cooling Rate ◽

Solidification Process ◽

Casting Process ◽

Continuous Casting Process ◽

Peritectic Steel ◽

Laser Confocal Microscope ◽

Initial Solidification

In the continuous casting process, the shrinkage of the peritectic phase transition during the initial solidification process has an important influence on the surface quality of peritectic steel. The initial solidification process of 0.10C%, 0.14C%, and 0.16C% peritectic steels was observed in situ by a high temperature laser confocal microscope, and the contraction degree during initial solidification was characterized by surface roughness. The results showed that under the cooling rate of 20 °C/s, the surface roughness value Ra(δ/γ) of 0.10C% peritectic steel was 32 μm, the Ra(δ/γ) value of 0.14C% peritectic steel was 25 μm, and the Ra(δ/γ) value of 0.16C% peritectic steel was 17 μm. With increasing carbon content, the contraction degree of the δ→γ transformation decreased, and the value of the surface roughness Ra(δ/γ) declined. Therefore, surface roughness can characterize the contraction degree of the δ→γ transformation in the initial solidification process of peritectic steel under the condition of a large cooling rate.

Download Full-text

Mechanical Property of (Al, Mg)B2 Phase Reinforced Al-Mg-B Alloys

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.813.47 ◽

2013 ◽

Vol 813 ◽

pp. 47-50

Author(s):

Jae Ik Cho ◽

Cheol Woo Kim

Keyword(s):

Mechanical Property ◽

Ternary Alloy ◽

Composite System ◽

Solidification Process ◽

Mechanical Behaviors ◽

Dendritic Region ◽

Initial Solidification

The microstructure and mechanical behaviors of the Al-Mg-B ternary alloy have been investigated in order to fabricate a composite system composed of (Al,Mg)B2 in a Al-Mg matrix. Several Al-Mg-B ternary alloy compositions were selected for identification of borides and matrix formation during solidification. The in-situ (Al,Mg)B2 phase was developed in an eutectic matrix of Al8Mg5 and Al, and formed in the location of inter and intra the Al dendritic region, indicating that the formation of (Al,Mg)B2 was developed at the initial solidification process. Dominating factors for controlling the (Al,Mg)B2 phase and mechanical behaviors are discussed in terms of structural identifications.

Download Full-text