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The Effect of Compressive Residual Stresses of Two-stage Shot Peening far Fatigue life of Vehicle Spring Steel  

박경동 (부경대학교 기계공학부)
정찬기 (부경대학교 대학원)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.11, no.1, 2003 , pp. 185-192 More about this Journal
Abstract
Recently the steel parts used at automobiles are required to be used under high stress more than ever before in need of the weight down. To achieve this requirement of a high strength steel, it must be necessary to decrease inclusion content and surface defect as like decarburization, surface roughness etc.. In this study, the surface conditions are measured to Dow the influence on fatigue properties by two cases of shot peening of two-stage shot peening and single-stage shot peening. And for this study, three kinds of spring steel (JISG4081-SUP7, SAE 9254, DON 50CrV4) are made. This study shows the outstanding improvement of fatigue properties at the case of two-stage shot peening in the rotary bending fatigue test and this is assumed to be from (1) Decreasing the surface roughness (2) Unchanging the surface hardness (3) Increasing the compressive residual stress. But, results also show fatigue failures originated at inclusion near surface, and this inclusion type is turned out to be a alumina of hish hardness.
Keywords
Shot peening; Compressive residual stress; Rotary bending; Fatigue life;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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