초음파 나노표면개질 공정기술에 의한 AISI304 스테인리스강의 표면나노구조화 및 압축잔류응력 형성

• Published in: 대한금속·재료학회지, 48(9) Vol. 48; no. 9; pp. 807 - 812
• Main 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
• Format: Journal Article
• Language: Korean
• Published: 대한금속재료학회 20.09.2010; 대한금속·재료학회
• Subjects: nanostructured materials; residual stress; surface modification; ultrasonics; 재료공학
• ISSN: 1738-8228; 2288-8241

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.