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Nonlinear 2θ-sin2ψ diagram by shot peening on spring steel

Published online by Cambridge University Press:  01 March 2012

Takayuki Sakakibara  and
Yoshihiro Sato
Takayuki Sakakibara
Affiliation:
Chuo Spring Co., Ltd. and Osaka City University, Japan
Yoshihiro Sato
Affiliation:
Chuo Spring Co., Ltd. and Osaka City University, Japan
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Abstract

Round and spiral-shaped coil springs enable various peening angles that correspond to the surface location, and the directional shot angles may lead to a nonuniform residual stress on the coil spring surface. It is commonly known that a material under directional deformation exhibits a nonlinear 2θ-sin2ψ diagram (ψ split) due to the triaxial stress state. In this study, the residual stress distributions of spring materials deformed by shot peening at different angles were measured, and the microstructure for carbide precipitates was examined using a field-emission scanning electron microscope (FE-SEM). The nonlinearity in the 2θ-sin2ψ diagram for the shot peening samples was revealed. The extent of the ψ split increased with increasing shot peening angles, and was dependent not only on the mass fraction of carbide particles but also on the size distribution of the carbide particles.

Type
Strain/Stress Analysis
Information
Powder Diffraction , Volume 20 , Issue 2 , June 2005 , pp. 117 - 120
Copyright
Copyright © Cambridge University Press 2005

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