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Influence of Water-Jet on Micro-Formed Parts Process via Nano-Indentation and SEM Analysis

Quaisie James Kwasi, Yamba Philip, Mwinteribo Tabie Vitus, Akayeti Anthony, Kukurah Jamal-Deen, Mohammed Abdul-Hamid

Advances in Science and Technology. Research Journal

2023

Vol. 17, no 2

353--361

Based on the experimental study of cavitation water jet impact on microforming, a single round hole micro-die was used in this paper. The effect of different process parameters on the performance of 304 stainless steel foil was examined, which involves the nanometer hardness, and elastic modulus. The nano-indentation tester was used to test the nano-hardness of the formed part, and the performance of the workpiece before and after the impact was analyzed. The nano hardness and elastic modulus increased significantly with an increase in the incident pressure. When the incident pressure was 20 MPa and the impact time of 5 min, the hardness increased by at least 122%, and the elastic modulus increased by at least 76%. After the cavitation water jet shocked the metallic foil of the SEM analysis and the results indicated that, as the incident pressure increases, the surface morphology of the formed part changes from approximately spherical to spherical, and the spherical roundness increases. In addition, there were different degrees of defects at the bottom of the formed part, and as the incident pressure increased, the bottom defects became more and more obvious, from micro-cracks to micro-layer cracks.

Analiza zużycia cienkiej folii metalowej

Komar W.

Mechanik

2015

R. 88, nr 7CD

417--424

W artykule przedstawiono rezultaty badania zużycia pary ciernej przygotowanej z materiałów wyselekcjonowanych na elementy robocze łożyska foliowego. Badania realizowano w skojarzeniu folia-rolka na specjalnie do tego celu przygotowanym stanowisku badawczym. Wyniki zaprezentowanych badań są podstawą do końcowego wnioskowania o doborze właściwych materiałów do konstrukcji prototypowego łożyska foliowego.

Wear research results of friction couple made from materials selected for working element of the foil bearing were presented in this paper. Research were conducted using the foil- roller combination at the research stand that was dedicated for such tests. Results of presented research make the base for the final conclusion on the proper materials selection for the prototype foil bearing.