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Materials Science and Engineering: An Introduction

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Unformatted text preview: REVISED PAGES 192 - Chapter 7 I Dislocations and Strengthening Mechanisms Ductilitir (EH-l) 1040 Steel _ 20 140 120 900 120 800 100 s C s 700 me e E so 3 E 5 ._. g z 5 E, ’33 E“ 600 E” 5 e e 3 L. m :a so 3 1'; 50 E E =5, .2 e e 500 g r fl I— 40 400 50 300 20 40 7B 200 70 Percent cold work Percent cold work {a} (b) Figure 7.19 For 1040 steel, brass. and copper, (a) the increase in yield strength, (1)) the increase in tensile strength, and (c) the decrease in ductility (%EL) with percent cold work. [Adapted from Metals Handbook: Properties and Selection: Irons and Steels, Vol. 1, 9th edition, B. Bardes (Editor), American Society for Metals, 1978, p. 226; and Metofs Handbook: Properties and Selection: Nonferrous Alloys and Pure Metals. Vol. 2. 9th edition, Percent cold “Wk H. Baker (Managing Editor), American Society for Metals, 1979, (a) pp. 276 and 327.] 30 4D 50 60 70 Figures 7.19:1 and 7.1913 demonstrate how steel, brass, and copper increase in yield and tensile strength with increasing cold work. The price for this enhancement of hardness and strength is in the ductility of the metal. This is shown in Figure 7.19:3, in which the ductility, in percent elongation, experiences a reduction with increas- ing percent cold work for the same three alloys. The influence of cold work on the EQA ...
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