. Electric railway journal . Fig. 4 Fig. 5 HEAT TREATMENT FOR AXLES—FIG. 3—HEATING AND COOLING CURVES OF STEEL. FIG. 4—MICRO-PHOTOGRAPH OF OIL-QUENCHEDSTEEL, BRINELL HARDNESS 364. FIG. 5—MICRO-PHOTOGRAPH OF WATER-QUENCHED STEEL, BRINELL HARDNESS 555 hardening operation, can be somewhat changed. Theextent of this rearrangement is controlled by the tem-perature to which the piece is reheated and the lengthof time it is held at this temperature. The result is todecrease the hardness of the metal and increase itstoughness. The arrangement of the carbides thus pro-duced is stable at atmospheric tem
. Electric railway journal . Fig. 4 Fig. 5 HEAT TREATMENT FOR AXLES—FIG. 3—HEATING AND COOLING CURVES OF STEEL. FIG. 4—MICRO-PHOTOGRAPH OF OIL-QUENCHEDSTEEL, BRINELL HARDNESS 364. FIG. 5—MICRO-PHOTOGRAPH OF WATER-QUENCHED STEEL, BRINELL HARDNESS 555 hardening operation, can be somewhat changed. Theextent of this rearrangement is controlled by the tem-perature to which the piece is reheated and the lengthof time it is held at this temperature. The result is todecrease the hardness of the metal and increase itstoughness. The arrangement of the carbides thus pro-duced is stable at atmospheric temperatures, or in factat any temperature below the draw back or temperingpoint. Heat treatment is complete with this operation. Heat Treatment of Car Axles While the fundamental reason for annealing is to re-lieve axles from any forging strains which may havebeen set up, this operation can be so conducted as some-what to increase the elastic limit over that of normalsteel. For example, a comparison of the physical pro
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