| Title |
Formation of Nano-structure and Compressive Residual Stress on AISI304 Stainless Steel by Ultrasonic Nanocrystalline Surface Modification |
| Authors |
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) |
| DOI |
https://doi.org/10.3365/KJMM.2010.48.09.807 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
nanostructured materials; surface modification; residual stress; ultrasonics |
| 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. |