Referring now to FIG 5, the radially outer wall 125 provides a substrate 198, which may first be first suitably prepared or treated, and then {HEAD ~ laser shock} peened to produce {TAIL ~ an annular laser shock peened surface} 54 and a pre stressed region 56 having deep compressive residual stresses imparted by laser shock peening extending into the radially outer wall 125 and the substrate 198 from the laser shock peened surface 
Referring now to FIG 5 , the radially outer wall 125 provides a substrate 198 , which may first be first suitably prepared or treated , and then { HEAD ~ laser shock } peened to produce { TAIL ~ an annular laser shock peened surface } 54 and a pre stressed region 56 having deep compressive residual stresses imparted by laser shock peening extending into the radially outer wall 125 and the substrate 198 from the laser shock peened surface
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