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ウォータジェットピーニングを受けたオーステナイト系ステンレス鋼の残留応力

Residual stresses of water-jet peened austenitic stainless steel

鈴木 賢治*; 菖蒲 敬久  ; 城 鮎美

Suzuki, Kenji*; Shobu, Takahisa; Shiro, Ayumi

ウォータージェットピーニング(WJP)による残留応力特性を明らかにするため、高エネルギー放射光および中性子を用いた深さ方向の残留応力測定を実施した。試験片にはSUS316Lを使用し、WJPを熱処理した試験片、773Kの大気中にて熱時効した試験片をそれぞれ作成し、計測した複数の回折面から表面残留応力状態の熱時効時間依存性を評価した。その結果、圧縮残留応力は1.5mm程度の深さまで内在していること、今回の熱時効程度では応力緩和が発生しないことなどを明らかにした。

The specimen material was austenitic stainless steel, SUS316L. The residual stress was induced by water-jet peening. The residual stress was measured using the 311 diffraction with conventional X-rays. The measured residual stress showed the equi-biaxial stress state. To investigate thermal stability of the residual stress, the specimen was aged thermally at 773 K in air to 1000 h. The residual stress kept the equi-biaxial stress state against the thermal aging. Lattice plane dependency of the residual stress induced by water-jet peening was evaluated using hard synchrotron X-rays. The residual stress measured by the soft lattice plane showed the equi-biaxial stress state, but the residual stress measured by the hard lattice plane did not. In addition, the distributions of the residual stress in the depth direction were measured using a strain scanning method with hard synchrotron X-rays and neutrons.

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