댓글 0건 조회 102회 작성일 2023-06-08 09:52
We found that remarkable martensitic transformation occurs during electrochemical polishing (EP) in 16Cr-5Ni metastable austenitic stainless steel. It was observed through EBSD measurement that the α’ martensite fraction increases as the applied voltage and EP time increase. Interestingly, upon comparing EBSD, XRD, and ferritescope measurements, it was confirmed that the martensitic transformation is confined to the surface where EP took place. To investigate the mechanism by which the EP process induces the martensitic transformation, COMSOL Multiphysics was used to calculate the electric charge distribution on the specimen surface under various applied voltages. In order to accurately consider the surface shape of the specimen, we used AFM for measurement of the three-dimensional space distribution of asperities, which was utilized as an initial condition of COMSOL Multiphysics simulation. Finally, through the first-principles calculations reflecting the obtained charge distribution in the surface region, it was concluded that significant stress could be developed due to the charge build-up on the surface, resulting in stress-induced martensitic transformation on the surface of the metastable austenitic stainless steel during EP.
- 이전글[SSL]Prof. Sung-Joon Kim : Effects of strain rate on tensile ductility in Cu-added stable Fe–Cr–Ni-based austenitic stainless steels 23.06.08
- 다음글Prof. Young-Seek Yoon : Rotary hearth furnace for steel solid waste recycling: Mathematical modeling and surrogate-based optimization using industrial-scale yearly operational data 23.04.05
등록된 댓글이 없습니다.