Electrical discharge process for rapid oxycarburisation of titanium in air. (June 2015)

• Record Type: Journal Article
• Authors: Jo, Y. J.; Jo, Y. H.; Seong, J. G.; Kim, Y. H.; Chang, S. Y.; Lee, W. H.
• Is Part Of: Materials science and technology. Volume 31:Number 8(2015:Aug.)
• Page Start: 989
• Page End: 995
• Publication Date: 2015-06
• Subjects: Titanium, -- Electrical discharge, -- Surface modification, -- Heat treatment, -- X-ray photoelectron spectroscopy (XPS); Materials science -- Periodicals; Microstructure -- Periodicals; Metallurgy -- Periodicals; 620.1105
• DOI: 10.1179/1743284714Y.0000000666
• Languages: English
• ISSNs: 0267-0836

Abstract

Abstract : A single pulse of 2·0–3·5 kJ of input energy from a 450 μF capacitor was applied to a Ti rod. The electrical discharge process can produce rapid temperature increases of Ti from 569 to 2398°C in times as short as 159 μs, depending on the input energy. With an input energy greater than 2·5 kJ, a β→α allotropic transformation occurred, showing a typical serrated morphology. At the same time, the original surface of Ti rod with TiO2 was modified into the form of primarily titanium oxycarbide. A much higher value of hardness that was observed at the edge of the cross-section was thus attributed to oxygen- and carbon-induced solid solution hardening during the electrical discharge process.