11_3

Materials Science and Engineering: An Introduction

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246 11.10 The two thermal properties of a liquid medium that influence its quenching effectiveness are thermal conductivity and heat capacity. 11.11 (a) This part of the problem calls for us to construct a radial hardness profile for a 50 mm (2 in.) diameter cylindrical specimen of an 8640 steel that has been quenched in moderately agitated oil. In the manner of Example Problem 11.1, the equivalent distances and hardnesses tabulated below were determined from Figures 11.5 and 11.8. Radial Equivalent HRC Position Distance, mm (in.) Hardness
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Unformatted text preview: Surface 7 (5/16) 54 3/4 R 11 (7/16) 50 Midradius 14 (9/16) 45 Center 16 (10/16) 44 The resulting profile is plotted below. 2 1 42 44 46 48 50 52 54 56 Position Hardness (HRC) (b) The radial hardness profile for a 75 mm (3 in.) diameter specimen of a 5140 steel that has been quenched in moderately agitated oil is desired. The equivalent distances and hardnesses for the various radial positions are tabulated below. Radial Equivalent HRC Position Distance, mm (in.) Hardness Surface 13 (1/2) 41 3/4 R 19 (3/4) 35...
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