By P. Hodgeson
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Additional info for Quenching and carburising
Nitrogen has hitherto been mostly 1200 1200 1000 1000 -, - Gn Tempenture 5O"C _____ Gn Temperature'l00"C 800 800 E 600 E 600 ! \~ 1Y I ! I I /' Q ! 12 14 Time (Mins) Fig. 17. Influence of the following parameters on cooling curves or cooling rate for gas quenching in vacuum furnaces: (a) gas temperature, and heat transfer coefficient; (b) gas velocity; (c) gas pressure; (d) gas properties; (e) gas flow pattern (furnace design); (f) size (mass) of work-piece. 24 Quenching and Carburising Table 2.
Higher hardness and bigger depth of hardening, as is shown in Fig. 24, can also result from intensive quenching. This offers the possibility in some cases, to use a cheaper carbon steel instead of an alloyed one. According to Kern", the reasons for using intensive quenching may be one or a combination of the following: • To achieve microstructures, in the surface of a part and in some instances below the surface, that are essentially 100 martensitic. • To develop high temperature gradients and to obtain high residual compressive stresses.
6 mls in the working space are possible. By adding water into a salt bath whose temperature is higher than the boiling temperature of water, the main problem is how to keep this added amount of water constant, because of evaporation. Figure 19 shows a newly developed device for automatic continuous addition of water into the hot salt bath. Provided the temperature of the salt bath and its agitation rate are constant, its quenching intensity can be maintained within close tolerance by the application of the mentioned device.
Quenching and carburising by P. Hodgeson