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Materials Science and Engineering: An Introduction

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257 CHAPTER 12 METAL ALLOYS PROBLEM SOLUTIONS 12.1 The advantages of cold working are: 1) A high quality surface finish. 2) The mechanical properties may be varied. 3) Close dimensional tolerances. The disadvantages of cold working are: 1) High deformation energy requirements. 2) Large deformations must be accomplished in steps, which may be expensive. 3) A loss of ductility. The advantages of hot working are: 1) Large deformations are possible, which may be repeated. 2) Deformation energy requirements are relatively low. The disadvantages of hot working are: 1) A poor surface finish. 2) A variety of mechanical properties is not possible. 12.2 (a) The advantages of extrusion over rolling are as follows: 1) Pieces having more complicated cross-sectional geometries may be formed.
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Unformatted text preview: 2) Seamless tubing may be produced. (b) The disadvantages of extrusion over rolling are as follows: 1) Nonuniform deformation over the cross-section. 2) A variation in properties may result over a cross-section of an extruded piece. 12.3 Four situations in which casting is the preferred fabrication technique are: 1) For large pieces and/or complicated shapes. 2) When mechanical strength is not an important consideration. 3) For alloys having low ductilities. 4) When it is the most economical fabrication technique. 12.4 This question asks us to compare sand, die, investment, and continuous casting techniques....
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This document was uploaded on 05/04/2010.

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