Patent ID: 8253081

Claim:
A work piece ( 20 ), having a bearing surface ( 22 ) and a working surface ( 24 ) wherein the working surface ( 24 ) is treated by an electromagnetic pulse, comprising: a treated surface ( 30 ) formed when the electromagnetic pulse strikes the working surface ( 24 ), wherein the treated surface ( 30 ) has: (A) a residual compressive stress layer ( 600 ), whereby the residual compressive stress layer ( 600 ) is formed such that substantially no stress change occurs in the bearing surface ( 22 ) opposite the residual compressive stress layer ( 600 ), and (B) an electromagnetic indentation ( 300 ) having: (i) an indentation perimeter ( 310 ); (ii) an indentation sidewall ( 330 ); (iii) an indentation transition region ( 320 ) extending from the indentation perimeter ( 310 ) to the indentation sidewall ( 330 ), wherein the indentation transition region ( 320 ) is described by an indentation transition radius ( 322 ); (iv) an impact region ( 350 ) formed at an indentation depth ( 360 ), wherein the indentation depth ( 360 ) is measured from an untreated surface ( 26 ) to the impact region ( 350 ); and (v) an impact transition region ( 340 ) extending from the indentation sidewall ( 330 ) to the impact region ( 350 ), wherein the impact transition region ( 340 ) is described by an impact transition region radius ( 342 ), and the indentation transition region ( 320 ) and the impact transition region ( 340 ) are curvilinear.