By J. F. Grandfield, D. G. Eskin, Ian Bainbridge
Direct-chill casting is the most important construction path for wrought aluminium and magnesium alloys which are later deformed (rolled, extruded, solid) to the ultimate items. to assist during this technique, this ebook presents accomplished assurance on themes reminiscent of the background of method improvement during this box, commercial purposes, together with vertical and horizontal casting, soften instruction, basics of solidification in DC casting, and extra. the 1st booklet specified for the commercial researcher and practitioner, it pulls jointly the perform and technique of physics with the target of bettering method functionality
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Extra info for Direct-Chill Casting of Light Alloys: Science and Technology
T. Ennor. US Patent 2301027, 1942, filed 1938. 20. W. H. Pruitt. R&D for Industry. A Century of Technical Innovation at Alcoa, Cambridge University Press, Cambridge, 1990, pp. 251–262. 21. G. B. Hirst. J. Inst. , 1952–1953, vol. 81, pp. 393–400. 22. W. Roth, E. Weisse. Aluminium, vol. 26, no. 7/8, 1942, pp. 134–136. 23. W. Roth. GB Patent 492216, 1937. 24. P. Brenner, W. Roth. Metallwirtschaft, Metallwissenschaft, Metalltechnik, 1942, vol. 21, pp. 695–699. 25. W. Roth. Aluminium, 1943, vol. 25, pp.
Although stable launder level control is desired for the melt treatment and casting operations, the control of the metal level tends to be poor with a stationary furnace tap hole. It is also not as safe to shut down the metal flow compared to a tilting furnace which naturally falls back to a safe position. The stationary furnace is mounted at a higher floor level than the casting machine, requiring stairs (introducing dangers for personnel) and making the movement of vehicles and materials around the cast shop more difficult.
All these issues are addressed in Chapters 2, 3, 5, and 6. The history of DC casting invention and progress shows that the engineering ingenuity always matched the demands of the industry and answered the challenge of new products and new materials. 2. 563 Weaker solidified shell, more prone to surface cracking Coefficient of linear thermal expansion, K−1 Thermal conductivity of liquid, W/m K Latent heat, J/kg Volumetric latent heat, J/m3 Liquid thermal expansion, kg/K m3 Kinematic viscosity, m2/s Surface tension, N/m Large thermal gradient in a casting, slower heat removal, but per unit volume heat removal rate is comparable Easier to cool the same volume More prone to air-gap formation, shape distortion Slower superheat dissipation packaging (including beverage cans), construction, and maritime with specific products made out of specific alloys.