キャビテーション・ショットレス・ピーニングによるSUS316Lステンレス鋼の表面改質層の縦弾性係数の低減

概要

論文の詳細を見る
Peeing is a technique of surface modification to improve fatigue strength of metallic materials. Cavitation shotless peeing (CSP) is the peeing method using cavitation impacts and shots are not required. Residual stress and hardness of materials are also changed by CSP. Similarly, Young's modulus of surface improvement layer might be changed by CSP. Young's modulus is one of the main mechanical properties of materials, and indicates material structure, and it is an important parameter for stress measurement by X-ray diffraction. In the present paper, Young's modulus of type 316 L stainless steel peened by CSP was evaluated by measuring natural frequency of cantilever. And, Young's modulus of surface modification layer is evaluated by assuming composite cantilever. It was revealed that Young's modulus of surface modification layer by CSP was decreased about 11%, although Vickers hardness was increased about 40%. Namely, elastically hardness is decreased, and plastically hardness is increased by CSP.
社団法人日本機械学会の論文
2008-06-25