“…A high O 2 to Ar gas flow ratio leads to excellent oxidising layer mechanical properties [16]; however, as shown in Figures 4 and 5 and Table 5, a high O 2 to Ar gas flow ratio results in poor surface formation. Therefore, further investigations on the effect of gas flow ratio on surface formation are needed.…”
Section: Resultsmentioning
confidence: 99%
“…The process parameters used in laser gas oxidising are listed in Table 1. The process parameters were selected from our previous study [16]. Figure 1 Schematic of the experimental setup.…”
Section: Methodsmentioning
confidence: 99%
“…In a previous study [16], a new process involving laser gas oxidation of titanium surface in a dilute O 2 atmosphere was presented. O 2 was diluted with Ar to reduce the reaction rate between O 2 and Ti, and the Ti surface was heated using a laser to form a molten pool in the diluted O 2 atmosphere.…”
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 O 2 concentration required for Ti-6Al-4V to self-sustain combustion. To understand the flow behaviour of the Ti-6Al-4V fluid, a highspeed 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 O 2 to Ar gas flow ratio, and the oxidising layer is rough with macroscopic cracks, while a low O 2 to Ar gas flow ratio results in a smooth oxidising layer without cracks. Ti-6Al-4V can self-sustain combustion when the O 2 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.
“…A high O 2 to Ar gas flow ratio leads to excellent oxidising layer mechanical properties [16]; however, as shown in Figures 4 and 5 and Table 5, a high O 2 to Ar gas flow ratio results in poor surface formation. Therefore, further investigations on the effect of gas flow ratio on surface formation are needed.…”
Section: Resultsmentioning
confidence: 99%
“…The process parameters used in laser gas oxidising are listed in Table 1. The process parameters were selected from our previous study [16]. Figure 1 Schematic of the experimental setup.…”
Section: Methodsmentioning
confidence: 99%
“…In a previous study [16], a new process involving laser gas oxidation of titanium surface in a dilute O 2 atmosphere was presented. O 2 was diluted with Ar to reduce the reaction rate between O 2 and Ti, and the Ti surface was heated using a laser to form a molten pool in the diluted O 2 atmosphere.…”
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 O 2 concentration required for Ti-6Al-4V to self-sustain combustion. To understand the flow behaviour of the Ti-6Al-4V fluid, a highspeed 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 O 2 to Ar gas flow ratio, and the oxidising layer is rough with macroscopic cracks, while a low O 2 to Ar gas flow ratio results in a smooth oxidising layer without cracks. Ti-6Al-4V can self-sustain combustion when the O 2 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.
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