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オーステナイト系ステンレス鋼の高ひずみ速度による微視的残留応力

Residual micro-stresses in austenitic stainless steel due to high strain rate

鈴木 賢治*; 田邊 裕治*; 菖蒲 敬久  

Suzuki, Kenji*; Tanabe, Yuji*; Shobu, Takahisa

低速から高速のひずみ速度で塑性変形させたオーステナイト系ステンレス鋼SUS316Lの微視的残留応力について評価した。SPring-8による放射光応力測定の結果、微視的残留応力の形成にはひずみ速度依存性が存在することを明らかにした。加えて、111回折のように弾性異方性を考慮したヤング率が大きくなる回折面では圧縮応力、200回折のようにヤング率が小さくなる回折面では引張応力が得られることを明らかにした。

Austenitic stainless steel (SUS316L) was used as specimen material, and the plate specimens were deformed plastically with a wide range of strain rates (6.67$$times$$10$$^{-5}$$ $$sim$$ 6.70$$times$$10$$^{2}$$/s). The residual micro-stress for each lattice plane was measured with hard synchrotron X-rays. The residual macro-stress due to tensile deformation depended on strain rate. The residual micro-stresses varied from tension to compression, depending on the diffraction elastic constant. The soft lattice plane had tensile residual stress, and the hard lattice plane had compressive residual stress. The higher the strain rate, the smaller the difference in residual micro-stresses. The residual micro-stresses of the surfaces preened with the laser-preening or water-jet-preening were examined. Both surfaces had exhibited large compressive residual stress. The residual micro-stress on the peened surfaces showed a tendency opposite to residual micro-stress due to tensile deformation.

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