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The greater the surface hardness value the higher the pitting resistance. However, bending energy increases for surface hardness up to about 50 HRC, after which the rise is offset by an increase in notch sensitivity. A number of heat therapy course of selections exist for hardening a gear, each designed to extend automotive gears gear hardness. These often involve heating and rapid cooling and are usually categorized as via hardening, case hardening , and surface hardening by utilized power . Normalizing performs a significant position within the control of dimensional variation during hardening and case hardening.
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