COMPRESSIVE RESIDUAL-STRESS INTRODUCED BY SHOT PEENING

The distributions of residual stresses of shot peened 20Cr, 30CrMo, 40 Cr, GC4, 45 steels and LC9 aluminum alloy over the hardened layer were measured in an X-ray diffraction apparatus using the 0 and 30 degrees two-point method with step-by-step electrolytical dissolution, and th en studied quantitatively. The compressive residual stress at the surf ace, sigma(s)(rc), the maximum compressive residual stress, sigma(max) (rc), the depth of the compressive residual stress field (CRSF), Z(0), and the average diameter of peening dents D, could be calculated empi rically from the metal yield strength, sigma(0.2), the ultimate tensil e strength, sigma(b), and the peening intensity, f(A). (C) 1998 Elsevi er Science S.A.