Getting Higher Stress Capacity In Long-life Springs

Author:  Kurasz, G.W. and Maker, J.H.
Source:  Metal Progr., June '71, 99, -6-
Doc ID:  1971025
Year of Publication:  1971
Abstract:  
Employing a method involving electropolishing follwied by shot peening, we have raised fatigue strengths in automotive valve springs to exceptional levels. Briefly, the electropolishing virtually eliminates all small surface defects and minimizes the effects of larger defects by removing a measured depth of metal. Shot peening then induces compressive stresses in these surfaces.