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Investigation Of Microstructure And Purity Of Nickel Based Superalloy Master Alloy With Revert Remelting Method

Published: 2014
Authors: Chuanbo Ji, Xiaofeng Wang, Jie Yang, Jinwen Zou

The microstructure and purification technology of nickel based powder metallurgy superalloy was investigated with the revert remelting in the industrial vacuum furnace. The effect of melted filter system and secondary refining on the cleanness of the master alloy was also carried out in the experiment. The purity of the master alloy comparison between reverts and virgin alloy was also performed by the chemical analysis, gas content and big sample electrolysis methods.

Material Resources / Publications

Solidification Characteristics Of Fe-Rich Intermetallics And Its Effect On Mechanical Properties Of Squeeze Cast Al-5.0Cu-0.6Mn Alloy

Published: 2014
Authors: Wei wen Zhang, Bo Lin, Datong Zhang, Yuanyuan Li

The development of high performance Al-Cu based alloys generally depends on the strict control of the Fe content. With the increasing use of recycled aluminum alloys, it is necessary to extend the tolerance of Fe content for the purpose of low cost, energy saving and environment protection. In this paper, the solidification characteristics of Fe-rich intermetallics and its effect on mechanical properties of squeeze cast Al-5.0Cu-0.6Mn alloy with Fe content up to 1.5 wt% have been investigated.

Material Resources / Publications

Low Voltage, Cast Al-Zn-Bi, Sacrificial Anodes: Effect Of Heat Treatment

Published: 2014
Authors: Alan P. Druschitz, Katie Tontodonato

Heat treatment (solutionize and quench) altered the characteristic operating parameters and reduced the variation in performance of an aluminum-zinc-bismuth alloy sacrificial anode as measured by galvanostatic, potentiostatic, open circuit, Tafel and galvanic corrosion tests. The specific alloy composition was Al-0.57 wt% Zn-0.55 wt% Bi and the heat treatment was solutionize at 5380C (1000┬░F) for 96 hours followed by water quenching. The average potential and corrosion rate from galvanostatic tests were -0.815 } 0.011 V sce and 0.35 } 0.02 mg/hr for as-cast material and -0.798 } 0.010 V sce and 0.36 } 0.02 mg/hr for heat treated material.

Material Resources / Publications

Effect Of Nickel Additions On Solidification Structure And Aging Response In Copper-Manganese Alloys

Published: 2014
Authors: Kevin J. Chaput and Kevin P. Trumble

Recently a binary alloy based around the congruent point (Cu-35Mn) in the Cu-Mn system was developed as a lead-free casting bronze. The unique feature of this alloy was that the as-cast microstructure displayed a cellular solidification structure free of shrinkage porosity.

Material Resources / Publications

Numerical Simulation Of Molten Steel Flow And Inclusions Motion Behavior In The Solidification Processes For High Speed Continuous Casting Slab

Published: 2014
Authors: Shaowu Lei, Jiongming Zhang, Xinkai Zhao, Qipeng Dong

A three-dimensional numerical simulation of transient fluid flow field during the solidification processes for high speed continuous casting slab has been developed to predict the solidification front capturing the inclusions at different casting speed and the distribution of the inclusions at the different location in the inner surface layer for high speed process has been given.

Material Resources / Publications

Flow And Temperature Field Evolution During Solidification Of An Electromagnetically Stirred Melt: Influence Of Magnetic Shields

Published: 2014
Authors: Gregory Poole, Laurentiu Nastac

This paper investigates the effect of magnetic shield placement in proximity to an electromagnetically-stirred melt undergoing solidification. The electromagnetic field in both the molten metal and magnetic shields was computed using the mutual inductance technique. An improved dual-zone model was employed to describe the flow behavior in the mushy region.

Material Resources / Publications

Numerical Simulation On Optimization Of Center Segregation For 50Crmo Billet

Published: 2014
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.

Material Resources / Publications

Precipitation In Continuously Cast Microalloyed Steels

Published: 2014
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.

Material Resources / Publications

Research And Application Of Numerical Simulation On Optimizing Of Ingot Casting Process

Published: 2014
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.

Material Resources / Publications

Numerical Modeling Of The Dispersion Of Ceramic Nanoparticles During Ultrasonic Processing Of 6061-Based Nanocomposites

Published: 2014
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.

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