Effect of Addition of NiO Powder on Pore Formation in Lotus-Type Porous Carbon Steel Fabricated by Continuous Casting

2010 ◽  
Vol 658 ◽  
pp. 215-219 ◽  
Author(s):  
Makoto Kashihara ◽  
Hiroshi Yonetani ◽  
Shinsuke Suzuki ◽  
Hideo Nakajima
Keyword(s):  
Carbon Steel ◽  
Continuous Casting ◽  
Porous Carbon ◽  
Nitrogen Pressure ◽  
Nitrogen Atmosphere ◽  
Steel Plates ◽  
Casting Technique ◽  
Irregular Shapes ◽  
Solid Liquid Interface ◽  
Solid Liquid

Lotus-type porous carbon steel (lotus carbon steel) plates were fabricated by continuous casting technique in a pressurized nitrogen atmosphere. The experiments were done both with adding 0.3wt% of NiO powder in molten carbon steel in a ceramic crucible and without NiO powder. The lotus carbon steel fabricated without NiO powder under nitrogen pressures of 0.1 and 0.5 MPa had single pores which grew independently. On the other hand, the lotus carbon steel fabricated with adding NiO powder had pores which coalesced each other and became in irregular shapes. Under nitrogen pressure of 2.5 MPa, the pores formed with adding NiO powder were smaller than that formed without NiO powder. The porosity increased by adding NiO powder in every pressurized nitrogen atmosphere. From these results, NiO powder in molten carbon steel is considered to act as nucleation sites for pores at the solid-liquid interface and to increase of the pore number.

Fabrication of Lotus-Type Porous Carbon Steel Slabs by Continuous Casting Technique in Nitrogen Atmosphere

2010 ◽  
Vol 41 (9) ◽  
pp. 2377-2382 ◽  
Author(s):  
Makoto Kashihara ◽  
Shinsuke Suzuki ◽  
Yuki Kawamura ◽  
Sang-Youl Kim ◽  
Hiroshi Yonetani ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Continuous Casting ◽  
Porous Carbon ◽  
Nitrogen Atmosphere ◽  
Casting Technique ◽  
Steel Slabs

scholarly journals Mechanical property of lotus-type porous carbon steel fabricated by continuous casting method

2009 ◽  
Vol 165 ◽  
pp. 012071
Author(s):  
Y Kawamura ◽  
S Suzuki ◽  
S-Y Kim ◽  
H Nakajima ◽  
M Kashihara ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Carbon Steel ◽  
Continuous Casting ◽  
Porous Carbon ◽  
Casting Method

Analytical Solution on the Relation of Technique Parameters for Continuous Casting with Heated Mould

2011 ◽  
Vol 337 ◽  
pp. 225-231
Author(s):  
Feng Ni ◽  
Shi Zhong Wei ◽  
Rui Long
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Continuous Casting ◽  
Casting Speed ◽  
Specific Conductance ◽  
Liquid Interface ◽  
Mould Temperature ◽  
Interface Position ◽  
Solid Liquid Interface ◽  
Solid Liquid

The technique of continuous casting with heated mould is a kind of near-net-shape processing technology, which combines unidirectional solidification with continuous casting and has been used widely for new material development and processing. A steady-state heat-transfer model was suggested for pure metal case. Some of modeling parameters, such as equivalent specific conductance and equivalent heat-transfer coefficient, etc, had been defined. The analytic solution of temperature profile along the axis of casting rod was obtained for solid-liquid interface to be as origin of position coordinate, by which the relations had been solved among mould temperature, casting speed, solid-liquid interface position, equivalent specific conductance between mould and metal, equivalent heat-transfer coefficient of cooling of cast rod, temperature gradient and cooling rate of melt in front of solid-liquid interface. As an example, the coordinate relations of solid-liquid interface position, mould temperature and casting speed were calculated and compared with experimental results in the case of pure copper. The calculation results conformed very well to the experimental ones. And it was indicated that the cooling rate of melt in front of solid-liquid interface had a nonlinear relation with casting speed during steady continuous casting process.

Influence of vibration on grain size and degree of grain refinement in mild steel weldments

1993 ◽  
Vol 8 (9) ◽  
pp. 2228-2230 ◽  
Author(s):  
S.P. Tewari
Keyword(s):  
Grain Size ◽  
Mild Steel ◽  
Grain Refinement ◽  
Solid Phase ◽  
Steel Plates ◽  
Lower Amplitude ◽  
Experimental Findings ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
Fast Removal

Mild steel plates were welded under stationary and dynamic (longitudinal and transverse vibration) conditions. The frequency and amplitude ranges selected were 0 Hz to 300 Hz and 0 μm to 30 μm, respectively. It has been observed on the basis of experimental findings that vibration, in general, reduces the grain size of the weldment, and this reduction is appreciable at a lower amplitude of vibration. This may be due to the lower energy required for nucleation of the solid phase. Fast removal of latent heat of solidification from the solid liquid interface plays a significant part in the grain refinement under vibration.

scholarly journals Core–shell architecture based on bio-sourced porous carbon: the shape formation mechanism at the solid/liquid interface layer

RSC Advances ◽  
2019 ◽  
Vol 9 (44) ◽  
pp. 25544-25553 ◽  
Author(s):  
Anfar Zakaria ◽  
Jada Amane ◽  
El Alem Noureddine
Keyword(s):  
Formation Mechanism ◽  
Porous Carbon ◽  
Interface Layer ◽  
Liquid Interface ◽  
Core Shell ◽  
Shape Formation ◽  
Solid Liquid Interface ◽  
Solid Liquid

This paper focus on the shape formation mechanism of core–shell architecture based bio-sourced porous carbon prepared by biological activation at the solid/liquid interface.

In Situ Observation of Growth Process of δ Phase of 0.15% C Carbon Steel during Solidification

2011 ◽  
Vol 299-300 ◽  
pp. 341-344
Author(s):  
Xu Dong Yue ◽  
Guang Can Jin ◽  
Shu Ying Chen ◽  
Guo Wei Chang
Keyword(s):  
Growth Rate ◽  
High Temperature ◽  
Carbon Steel ◽  
Growth Process ◽  
High Temperature Phase ◽  
Liquid Interface ◽  
Temperature Phase ◽  
Solid Liquid Interface ◽  
Solid Liquid

In situ observation of growth process of high temperature phase in 0.15% C carbon steel during solidification concerned with using Confocal Scanning Laser Microscope (CSLM), the growth rate of -phase has been measured. The results indicate that high temperature -phase grows at cell crystal way when the cooling speed reaches 2°C/min in 0.15% C carbon steel. The -phase of round or oval cross-sectional shaped may grow stably. The growth rate of -phase is gradually getting slow along with increasing of curvature radius. The variation of growth speed tends to be similar with different solid-liquid interface shapes of -phase. The growth rate of concave solid-liquid interface is faster than that of convex solid-liquid interface for phase. The smaller radius of curvature of phase is, the faster the growth rate reaches.

scholarly journals Fabrication and Mechanical Properties of Lotus-type Porous Carbon Steel by Unidirectional Solidification in Nitrogen Atmosphere

2008 ◽  
Vol 94 (1) ◽  
pp. 30-34 ◽  
Author(s):  
Makoto Kashihara ◽  
Hirosi Yonetani ◽  
Takahiro Kobi ◽  
Soong-Keun Hyun ◽  
Shinsuke Suzuki ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Steel ◽  
Porous Carbon ◽  
Nitrogen Atmosphere ◽  
Unidirectional Solidification

Melt-Stirring Method: Influence on Ingot Purity During Ohno Continuous Casting

2019 ◽  
Author(s):  
Simbarashe Fashu ◽  
Lynette Mudzingwa ◽  
Aaron Mukuya ◽  
Macdonald Tozvireva ◽  
Rajwali Khan
Keyword(s):  
Flow Field ◽  
Continuous Casting ◽  
Melt Mixing ◽  
Mechanical Stirring ◽  
Solidification Model ◽  
Velocity Flow ◽  
High Purity Aluminum ◽  
Optimum Velocity ◽  
Solid Liquid Interface ◽  
Solid Liquid

This article outlines the findings in the comparison of the influence of mechanical and electromagnetic stirring (EMS) on ingot long-term purity and uniformity during Ohno continuous casting (OCC). The magnitude of the average optimum velocity flow field and stirring parameters required to effectively purify aluminum ingots using mechanical stirring of the melt was determined and analyzed. Basing on the determined optimum mechanical flow field, electromagnetic parameters producing almost the same flow field near the interface were obtained through careful adjustments of parameters. Optimum parameters of the mechanical and EMS were obtained by numerically solving the solidification model coupled with either the multi-reference frame model (for mechanical stirring) or the magnetohydrodynamic model (for EMS) in CFD Fluent 6.3.26 software. For mechanical stirring, an optimum stirring intensity of 2 mm/min was determined whilst for EMS, the optimum magnetic field with an amplitude of 20 mT and a frequency of 2.7 Hz was determined, and these produced same magnitude optimum flow fields resulting in high-purity aluminum ingots. Comparison of the two methods showed that EMS is good in covering all the regions near the solid–liquid interface and is more effective in bulk melt mixing; thus it produces more uniform and purer ingots for longer casting times.

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