Fragmentation device with increased surface hardness and a method of producing the same

A method of modifying material properties of a fragmentation device, comprising:

• providing a fragmentation device with a first surface, a first section extending from the first surface, a second section disposed on at least one side of the first section and extending from the first surface, a second surface spaced apart from the first surface, a third section extending from the second surface, and a fourth section disposed between the first, second, and third sections, the first section of the fragmentation device having a first thickness and the second section of the fragmentation device having a second thickness less than the first thickness, and an area of the first surface being greater than an area of the second surface;
• positioning the fragmentation device within a carbon-rich environment;
• increasing the temperature within the carbon-rich environment up to 1,200° C.;
• absorbing carbon from the carbon-rich environment into the first and second surfaces of the fragmentation device;
• increasing a content of carbon at the first and second surfaces to 0.06 wt. % carbon to 1.0 wt. % carbon;
• and
• maintaining an original content of carbon at 0.01 wt. % carbon to 0.05 wt. % carbon at the fourth section of the fragmentation device by controlling penetration of the carbon into the fourth section.