JOM

doi: 10.1007/BF03222233pmid: N/A

doi: 10.1007/BF03222224pmid: N/A

doi: 10.1007/BF03222226pmid: N/A

doi: 10.1007/BF03222225pmid: N/A

doi: 10.1007/BF03222227pmid: N/A

Bossi, Richard H.;Georgeson, Gary E.

doi: 10.1007/BF03222228pmid: N/A

Abstract As aerospace components become more complex, their cost increases and nondestructive evaluation of their quality takes on new significance. X-ray computed tomography is a nondestructive evaluation technique that provides quantitative information on material density, constituents, and dimensions. This capability is of considerable economic value to the aerospace manufacturing community, because it allows better control of materials, processes, and product quality. Additionally, data obtained through computed tomography can be used in the modeling of component behavior to help determine whether defects and flaws are grounds for rejection of a part.

Liedl, G. L.

doi: 10.1007/BF03222229pmid: N/A

Shibasaki, T.;Hayashi, M.

doi: 10.1007/BF03222230pmid: N/A

Abstract The Mitsubishi process is a continuous copper smelting and converting process comprising three steps—smelting of raw materials by injection, separation of slag and matte, and direct converting of high-grade matte. Since commercial operation began in 1974, the hearth productivity has been doubled, and several other improvements have been made, including higher-grade matte smelting and the treatment of various secondary materials. Because the Mitsubishi process is superior to the conventional process, it was decided to construct a larger unit of the Mitsubishi furnaces to replace the two existing smelter lines. This article discusses various technical considerations.

Leroy, Christophe;Pignault, Gérard

doi: 10.1007/BF03222231pmid: N/A

Abstract The three major characteristics of liquid aluminum quality are hydrogen content, alkaline content, and inclusion content. The past 20 years have seen considerable development in rotating gas injectors processes, at different steps of liquid metal processing in the casthouses, designed to address these three quality factors. Simultaneously, a great deal of academic work has been done to understand and model these processes, using knowledge from the fields of chemical engineering, thermodynamics, and fluid dynamics. This article shows how very simple efficiency models can be used to represent the processes, combining first-order kinetics for batch treatment and residence time distribution for in-line systems, leading to realistic efficiency laws. These laws are valid for all quality factors under the same form and involve very few parameters.

doi: 10.1007/BF03222232pmid: N/A