The following tabulated data were gathered from a series of Charpy impact tests on a tempered 4340

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The following tabulated data were gathered from a series of Charpy impact tests on a tempered 4340 steel alloy.

Temperature (°C) _______________ Impact Energy (J)

0 .................................................... 105

-25 ..................................................104

-50 ................................................. 103

-75 ................................................... 97

-100 ................................................. 63

-113 ................................................. 40

-125 ................................................. 34

-150 ................................................. 28

-175 ................................................. 25

-200 ................................................. 24

(a) Plot the data as impact energy versus temperature.

(b) Determine a ductile-to-brittle transition temperature as the temperature corresponding to the average of the maximum and minimum impact energies.

(c) Determine a ductile-to-brittle transition temperature as the temperature at which the impact energy is 50 J?

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Materials Science and Engineering An Introduction

ISBN: 978-1118324578

9th edition

Authors: William D. Callister Jr., David G. Rethwisch

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