Hammer bushings with hardened inner region

A method of manufacturing a bushing, comprising:

• forming a rough bushing with steel having a carbon content greater than about 0.58% by weight, the rough bushing having an inner surface and an outer surface opposing the inner surface;
• heating the rough bushing to a temperature of at least about 760° C.;
• quenching the rough bushing directly from the temperature at which the heating is performed to form a hardened bushing;
• tempering the hardened bushing at a temperature in a range of about 450° C. to about 570° C. to form a softened bushing;
• induction heating the softened bushing along the inner surface;
• quenching the softened bushing to form an inner region proximal to the inner surface, the inner region harder than the outer surface of the bushing;
• and
• tempering the bushing in a range of about 100° C. to about 400° C.

A machine comprising a component, wherein the component comprises:

• an inner surface;
• an outer surface;
• a bulk region disposed between the inner surface and the outer surface, the bulk region proximal to the outer surface, the bulk region having a bulk carbon concentration;
• and
• an inner region disposed between the inner surface and bulk region, the inner region having an inner region carbon concentration, wherein the inner region has a hardness of at least about 60 Rockwell Hardness Scale C (HRC), the bulk region has a hardness in the range of about 35 HRC to about 45 HRC, and the bulk carbon concentration and the inner region carbon concentration are substantially the same.