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Vol.48, No.9, 807 ~ 813, 2010
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| Title |
| Formation of Nano-structure and Compressive Residual Stress on AISI304 Stainless Steel by Ultrasonic Nanocrystalline Surface Modification |
| 조인식 In Shik Cho , 동계령 Ji Ling Dong , 유대황 Dae Hwang Yoo , 서정화 Jung Hwa Suh , 아마노프 Auezhan Amanov , 신기삼 Kee Sam Shin , 이창순 Chang Soon Lee , 편영식 Young Shik Pyoun , 박인규 In Gyu Park |
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| Abstract |
| In this paper, the Ultrasonic Nanocrystalline Surface Modification (UNSM) surface treatment process was used to induce compressive residual stress and nanocrystalline structure by severe plastic deformation on the UNSM-treated surface. The test results for AISI304 stainless steel demonstrated that the grain size was found to be 23 nm, the dislocation density was increased by 0.2085×10(18) m-2, and the volume fraction of martensite is defined as 27.6% from austenite so that the surface hardness of the surface is increased from 200 Hv up to 515 Hv. The initial tensile residual stress is changed from 300 MPa to a compressive residual stress of 500 MPa after UNSM treatment. In addition, UNSM was applied under five various conditions, and the results of those conditions were defined as a function of depth quantitative. |
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| Key Words |
| nanostructured materials, surface modification, residual stress, ultrasonics |
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