Studies from National Institute of Technology Yield New Data on Metals Research

By a News Reporter-Staff News Editor at Journal of Technology -- Data detailed on Metals Research have been presented. According to news originating from Mangalore, India, by VerticalNews correspondents, research stated, "Heat flux transients were estimated during unidirectional downward solidification of Al-22% Si alloy against copper, die steel and stainless steel chills. The chill instrumented with thermocouples was brought into contact with the liquid metal so as to avoid the effect of convection associated with the pouring of liquid metal."

Our news journalists obtained a quote from the research from the National Institute of Technology, "Heat flux transients were estimated by solving the inverse heat conduction problem. Higher thermal conductivity of chill material resulted in increased peak heat flux at the metal/chill interface. Peak heat flux decreased when 100 mu m thick alumina coating was applied on the chill surface. The lower thermal conductivity of alumina based coating and the presence of additional thermal resistance decreases the interfacial heat transfer. For uncoated chills, the ratio of the surface roughness (R-a) of the casting to chill decreased from 6.5 to 0.5 with decrease in the thermal conductivity of the chill material. However when coating was applied on the chill, the surface roughness ratio was nearly constant at about 0.2 for all chill materials. The measured roughness data was used in a sum surface roughness model to estimate the heat transfer coefficient."

According to the news editors, the research concluded: "The results of the model are in reasonable agreement with experimentally determined heat-transfer coefficients for coated chills."

For more information on this research see: Assessment of Heat Transfer During Solidification of Al-22% Si Alloy by Inverse Analysis and Surface Roughness Based Predictive Model. Transactions of the Indian Institute of Metals, 2012;65(6):539-543. Transactions of the Indian Institute of Metals can be contacted at: Springer India, 7TH Floor, Vijaya Building, 17, Barakhamba Road, New Delhi, 110 001, India. (Springer - www.springer.com; Transactions of the Indian Institute of Metals - www.springerlink.com/content/0972-2815/)

The news correspondents report that additional information may be obtained from J.a.y.a.n.a.n.d.a., .N.a.t.l. Inst Technol Karnataka, Dept. of Met & Mat Engn, Mangalore 575025, India.

Keywords for this news article include: Asia, India, Mangalore, Metals Research

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