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 laser shock peened to produce {HEAD ~ an annular laser shock peened surface} 54 and a pre stressed region 56 having {TAIL ~ 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 laser shock peened to produce { HEAD ~ an annular laser shock peened surface } 54 and a pre stressed region 56 having { TAIL ~ 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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