C.A.S.E. (chemically assisted surface enhancement) is a two-stage process consisting of shot peening followed by vibratory superfinishing. The fatigue enhancement properties of shot peening are complimented with a mirror like surface finish.
Applications that require both residual compressive stress and excellent surface finish include precision gears and airfoil blade geometry. Depending on the application and customer finish requirements the valleys of peening dimples can be retained for lubricant retention.
Depending on customer requirements, a component may be super finished as a standalone process or shot peened followed by super finishing which is the C.A.S.E. process.