12_7

Materials Science and Engineering: An Introduction

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263 Applications: aircraft structures, space vehicles, and in chemical and petroleum industries. Refractory Metals Distinctive features: extremely high melting temperatures; large elastic moduli, hardnesses, and strengths. Limitation: some experience rapid oxidation at elevated temperatures. Applications: extrusion dies, structural parts in space vehicles, incandescent light filaments, x-ray tubes, and welding electrodes. Superalloys Distinctive features: able to withstand high temperatures and oxidizing atmospheres for long time periods. Applications: aircraft turbines, nuclear reactors, and petrochemical equipment. Noble Metals Distinctive features: highly resistant to oxidation, especially at elevated temperatures; soft and ductile. Limitation: expensive. Applications: jewelry, dental restoration materials, coins, catalysts, and thermocouples.
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Unformatted text preview: Design Problems 12.D1 This question provides us with a list of several metal alloys, and then asks us to pick those that may be strengthened by heat treatment, by cold work, or both. Those alloys that may be heat treated are either those noted as "heat treatable" (Tables 12.6 through 12.9), or as martensitic stainless steels (Table 12.4). Alloys that may be strengthened by cold working must not be exceptionally brittle, and, furthermore, must have recrystallization temperatures above room temperature (which immediately eliminates lead). Heat Treatable Cold Workable Both 6150 Steel 6150 Steel 6150 Steel C17200 Be-Cu C17200 Be-Cu C17200 Be-Cu 6061 Al 6061 Al 6061 Al 304 Stainless Steel R50500 Ti C51000 Phosphor Bronze AZ31B Mg...
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This document was uploaded on 05/04/2010.

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