1413 キャビテーション・ショットレス・ピーニングによる圧縮残留応力の導入とミクロひずみの低減(G04-1 機械材料・材料加工(1),21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

概要

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Impacts at cavitation bubble collapses can be utilized for surface modification in the same way as shot peening. Peening method using cavitation impact was called "cavitation shotless peening (CSP)" as shots were not required. Peening is one of the techniques of surface modification to introduce compressive residual stress to improve fatigue strength of metallic materials and to reduce stress corrosion cracking (SCC). At the same time, CSP can release micro strain introduced mechanical finishing or heat treatment, introducing compressive residual stress in the material. There is a possibility that the large residual stress exists in micro-meter subsurface where less 10 μm from surface and 2D method using 2D detector can evaluate residual stress in sub-surface of polycrystalline metallic materials. Full width at half maximum of X-ray diffraction (FWHM) is closely related to micro strain in grain. In the present paper, stainless steel and Inconel were treated by CSP and residual stress and FWHM were evaluated. It was revealed that CSP decreased FWHM with introducing compressive residual stress in micro-meter subsurface.
一般社団法人日本機械学会の論文
2008-08-02