Fig. 6-Crack in carbide beginning to penetrate into matrix. X1890. Area increased approximately 50 pct for reproduction.It was found that a critical boron content exists which yields the maximum boronhardenability effect in hypoeutectoid steels, as was predicted from the mechanism proposed in a previous paper. The hardenability of boron steels with boron contents between 0.00005 and 0.0017 pet was dependent on the boron content, austenitizing temperature, quenching temperature, and austenite grain size. The effects of these variables on. hardenability can be explained by the mechanism previously proposed for the boron effeet.
The History of Metals in America presents the history of the development of metals in the United States as both an industrial activity and a science. Progress involving structural metals shaped modern society and this book chronicles the events. Each chapter describes the development of a metal or series of metal alloys, industry growth, and modern uses in manufacturing. The book includes chapters on cast iron, wrought iron, alloy steels, tool steels, stainless steels, nickel-base superalloys, aluminum, and titanium. Other chapters cover the science of metals as it developed from 1890 to 1950 and the biographies of the pioneers of metals research. The final chapters cover the formation, growth, and decline of the integrated steel industry and the rise of a new industry in steel minimills. For information on the print version, ISBN 978-1-62708-145-0, follow this link.
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