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Title: Improvement of Fatigue Strength of Nitrided High-Strength Valve Springs by Application of a New Super Fine Shot-Peening Techn
Author: Yamada, Teratoko, Saitoh, Sasada, Yanagihara
Source: SAE: 2001 World Congress, Detroit, MI, March 5-8, 2001, 2001-01-0834
Publication year 2001
Document number: 2001015
Number of pages: 11
Abstract:
ABSTRACT
The peening of fine steel beads with diameters less than 80um (referred to as SS Treatment in this paper) on the surface of nitrided and then conventionally shot-peened
(with 0.6mm diameter cut steel wires) high-strength helical springs made from developed high strength valve spring wire, was found to effectively improve spring fatigue
strength. This improved fatigue strength is mainly the result of very high compressive residual stress caused by work hardening of the spring surface layer without inducing
deleterious surface qualities such as harmful surface micro-fissuring or surface roughness.
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