Abstract
Experiments on high-rate carburizing in a dc glow-discharge plasma were extended to cover a broader range of temperature, carburizing gases, and steel compositions. Results show that the enhanced carburizing rate observed with methane is also obtained with its heavier homologues over the temperature range explored. The efficiency at which the carburizing gas is utilized during the carburizing stage was measured for both pure methane atmospheres and methane/nitrogen mixtures. AISI 4615 steel differential gears were plasma carburized at 1040 °C for performance tests to determine whether the more rapid carburization at the higher temperature would have any deleterious effect on impact fatigue life. In accelerated fatigue tests in an automobile, the performance of the plasma carburized gears equalled that of gears that had been carburized in the conventional way.
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