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Authors: Xiangzhou Gao, Jingshe Li, Shufeng Yang
In order to improve the center segregation of 50CrMo billet, a three-dimensional numerical model for continuous casting process was established to investigate the influence law of process parameters on secondary dendrite arm spacing (SDAS) and equiaxed crystal ratio.
Authors: Adeline Maitre, Douglas G. Ivey and Hani Henein
High strength low alloyed steels (HSLA) are an important class of steels used for pipeline transmission applications. Precipitates of various sizes, chemistries and volume fractions have been reported in the literature for these steels. The largest of these, microns in size, form during continuous casting. Many efforts have been focused on minimizing their formation as they deplete the matrix valuable microalloying elements that can precipitate in the solid steel during subsequent controlled thermo-mechanical processing resulting in further improved steel properties.
Authors: ZHOU Tongjun, L IU Junzhan, LUO Hui
During ingot casting process, the parametric changes of molten steel pouring process often cause both ingot surface and internal quality defects.
Numerical Modeling Of The Dispersion Of Ceramic Nanoparticles During Ultrasonic Processing Of 6061-Based Nanocomposites
Authors: D. Zhang, P.G. Allison, T.W. Rushing and L. Nastac
The metal-matrix-nano-composites (MMNCs) in this study consist of a 6061 alloy matrix reinforced with 1.0 wt.%SiC nanoparticles that are dispersed within the matrix using an ultrasonic cavitation dispersion technique available in the Solidification Laboratory at UA. The required ultrasonic parameters to achieve (i) the required stirring and cavitation for suitable degassing and refining of the aluminum alloy and (ii) the adequate fluid flow characteristics for uniform dispersion of the nanoparticles into the 6061 matrix are being investigated in this study by using an in-house developed CFD ultrasonic cavitation model.
Authors: ZHOU Tongjun
This paper describes the development of argon protection in the ingot casting process, and the production process of totally enclosed argon protection in a 40-tons production line. The influences of some related factors on the oxygen content are analyzed.
Control Of Internal Cracks In The Ingots Of Fe-Cr-Al Alloy Produced By Electroslag Remelting Process
Authors: Weihua Zhang, Shufeng YangR, Jingshe Li, Xiangzhou Gao
The reasons caused internal cracks in the 200 kg Fe-Cr-Al alloy ingot produced by electroslag remelting (ESR) process were analyzed by industrial experiments and the effects of mold structure, cooling method and intensity, and heating voltage and current were included.
Authors: Gang Li, Shufeng Yang, Jing she Li, Xiangzhou Gao
Arcing can result in arc point on the ingot surface in Electroslag Remelting process, which influences the quality of ingot. In this paper, a 200 kg iron-chromium alloy ingot was employed to study the formation mechanisms of arc point by industrial trials.
Authors: Miguel Angel Barbes, Jose Ignacio Verdeja, Maria Jose Quintana, Luis Felipe Verdeja, Roberto Gonzalez
The microstructure of Pressure Die Casting of an Al-8.5 Si-3.5 Cu alloy used for clean room tiles shows amount of constituents (eutectic and Si phases) that do not correspond to the ones indicated by the phase diagram. Furthermore, there are differences in amount of constituents between the core and the surface zones of parts produced by this process.
Authors: S.W. Hudson, D. Apelian
Aluminum alloy castings are becoming commonplace for critical applications in the automotive and aerospace industries where materials failure is not an option. In order to meet such property demands, tight control over the cleanliness of the melt (mitigation of solid particle inclusions) and microstructure must be achieved. In order to control cleanliness, it must first be well defined and measured.
New Simple Approaches For Designing Eco-Friendly Smart And Functional Coatings For Industrial Applications
Authors: Abdel Salam Hamdy Makhlouf
A new class of 'smart' or 'self-healing' advanced coatings of multifunctional properties has been developed during the last decade. Such properties add functionality to the materials of construction to protect themselves automatically after mechanical, physical or chemical damages. However, most of the smart coatings techniques available are quite expensive and need further investigation for possible use in real industrial applications.