Laser gas oxidising of Ti–6Al–4V surface: experimental and numerical investigation. (4th May 2022)

• Record Type: Journal Article
• Authors: Guo, Jinchang; Bian, Jianxiao; Zhang, Jianrui; Lian, Xiao; Jing, Qian
• Is Part Of: Surface engineering. Volume 38:Number 5(2022)
• Page Start: 529
• Page End: 540
• Publication Date: 2022-05-04
• Subjects: Oxidation -- Ti–6Al–4V -- Surface topographies -- Simulation -- Molten pool -- Self-sustain combustion -- Crack -- Flow; Surfaces (Technology) -- Periodicals; Coatings -- Periodicals; 620.4405
• DOI: 10.1080/02670844.2022.2111133
• Languages: English
• ISSNs: 0267-0844

Abstract

ABSTRACT: The laser gas oxidising of Ti–6Al–4V surface was studied. Confocal laser scanning microscopy techniques were used to investigate its two- and three-dimensional surface topographies. Gas flow behaviour was simulated to define the minimum O2 concentration required for Ti–6Al–4V to self-sustain combustion. To understand the flow behaviour of the Ti–6Al–4V fluid, a high-speed camera monitored the evolution of the Ti–6Al–4V fluid, and the flow behaviour was simulated. Experimental and simulation results show that Ti–6Al–4V can self-sustain combustion with a high O2 to Ar gas flow ratio, and the oxidising layer is rough with macroscopic cracks, while a low O2 to Ar gas flow ratio results in a smooth oxidising layer without cracks. Ti–6Al–4V can self-sustain combustion when the O2 concentration exceeds 65%. Furthermore, the laser molten pool and self-sustaining combustion zone mix and flow together, and a large self-sustaining combustion zone leads to a low convection velocity.