11_6

Materials Science and Engineering: An Introduction

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249 11.12 We are asked to compare the effectiveness of quenching in moderately agitated water and oil by graphing, on a single plot, hardness profiles for a 65 mm (2-1/2 in.) diameter cylindrical specimen of an 8630 steel that has been quenched in both media. For moderately agitated water, the equivalent distances and hardnesses for the several radial positions [Figures 11.8(a) and 11.6] are tabulated below. Radial Equivalent HRC Position
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Unformatted text preview: Distance, mm Hardness Surface 2.5 52 3/4 R 7 43 Midradius 11 36 Center 13 33 While for moderately agitated oil, the equivalent distances and hardnesses for the several radial positions [Figures 11.8(b) and 11.6] are tabulated below. Radial Equivalent HRC Position Distance, mm Hardness Surface 10 37 3/4 R 15 32 Midradius 18 29 Center 20 28 These data are plotted below. 20 30 40 50 60 Position Hardness (HRC) Water Oil...
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