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THE STRENGTH OF COLD-WORKED AND HEAT-TREATED STEELS 33.17
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THE STRENGTH OF COLD-WORKED AND HEAT-TREATED STEELS
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FIGURE 33.10 Location on end-quenched Jominy hardenability specimen corresponding to 50 percent from the center of round bars. (From [33.4] with permission of Pitman Publishing Ltd., London.)
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diameter and the Jominy distance (Fig. 33.15). For the 8640 steel the Jominy hardnesses are estimated as displayed in Table 33.12. The Rockwell C-scale hardness is plotted against Jominy distance in Fig. 33.16, upper contour. The softening due to 2 hours of tempering at 1000 F can be estimated as before using the addition method of Crafts and Lamont. The A term is evaluated as follows: D = 5.31 (Fig. 33.3) B = 9.90 (Fig. 33.4) f = 0.34 (Fig. 33.5) AMn = 2.25 (Fig. 33.6) ASi = 1.13 (Fig. 33.7) ACr = 2.59 (Fig. 33.17) ANi = 0.11 (Fig. 33.18) AMo = 3.60 (Fig. 33.19) A = 9.67
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THE STRENGTH OF COLD-WORKED AND HEAT-TREATED STEELS 33.18
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PERFORMANCE OF ENGINEERING MATERIALS
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FIGURE 33.11 Location on end-quenched Jominy hardenability specimen corresponding to the center of round bars. (From [33.4] with permission of Pitman Publishing Ltd., London.)
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FIGURE 33.12 Variation of surface ultimate strength with diameter for a 1040 steel oil-quenched (H = 0.35) from 1575 F and tempered 2 hours at 1000 F.
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THE STRENGTH OF COLD-WORKED AND HEAT-TREATED STEELS 33.19
THE STRENGTH OF COLD-WORKED AND HEAT-TREATED STEELS
TABLE 33.6 Equivalent Jominy Distances for Quenched Rounds at r/R
The tempered hardness equations become either RT = (RQ 5.31 9.90)0.34 + 9.90 + 9.67 = 0.34RQ + 14.4 or RT = RQ 5.31
TABLE 33.7 Equivalent Jominy Distances for Quenched Rounds at r/R
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THE STRENGTH OF COLD-WORKED AND HEAT-TREATED STEELS 33.20
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TABLE 33.8 Equivalent Jominy Distances for Quenched Rounds at r/R
The transition hardness obtained by equating the preceding pair of equations is RQ = 29.9. The Jominy curve may be corrected for tempering. Table 33.13 shows the tempered hardness and ultimate strength corresponding to the Jominy distances. The column RT is plotted against Jominy distance as the lower curve in Fig. 33.16. The surface ultimate strength can be estimated for diameters 0.5, 1, 2, 3, and 4 in. At a diameter of 2 in, the equivalent Jominy distance is 8.2 from Table 33.6. The surface ultimate strength as a function of diameter of round is displayed in Table 33.14. The ultimate tensile strength is found by interpolation in the prior display, entering with equivalent Jominy distance. The tensile ultimate strength at the surface versus diam-
TABLE 33.9 Equivalent Jominy Distances for Quenched Rounds at r/R
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THE STRENGTH OF COLD-WORKED AND HEAT-TREATED STEELS 33.21
THE STRENGTH OF COLD-WORKED AND HEAT-TREATED STEELS
TABLE 33.10 Surface Ultimate Strength of a 1040 Steel Heat-Treated Round as a Function of Diameter
eter of round is plotted in Fig. 33.20. Note the greater hardening ability of the 8640 compared to the 1040 steel of the previous section. Local interior properties are available using Figs. 33.9, 33.10, and 33.11. An estimate of the variation of properties across the section of a round 4 in in diameter will be made. The equivalent Jominy distances are 11.2 at r = 2 in, 18.0 at r = 1.6 in, 23.5 at r = 1 in, and 29.7 at r = 0. Thus Table 33.15 may be formed. The values of Su are obtained by interpolation; the values of Sy are estimated using Eq. (33.3). A plot is shown in Fig. 33.21. A common source for properties of steels is Modern Steels and Their Properties [33.5]. It is well to note that hardness was taken in this reference at the surface of a
FIGURE 33.13 Multiplying factors for five common alloying elements (for trace copper, use nickel curve). (From [33.4] with permission of Pitman Publishing Ltd., London).
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