Abstract
The combustion velocity and the mechanism for a series of Ti-Cr-V alloys with different chemical compositions are studied by a promoted ignition combustion test corresponding to different oxygen pressures to investigate the influence of alloying elements, such as Cr and V, on combustion behavior. The microstructures and composition distributions of the alloying elements in the reaction and oxide areas are observed and analyzed. The thermogravimetry analysis results show that the oxidation mass gain decreases with the increasing Cr content, and the oxidation resistance obviously increases from 10 Cr to 20 Cr. The combustion velocity decreases with increasing Cr content, and it is concluded that elevated Cr content can effectively retard the flame propagation velocity. Importantly, for the Ti-Cr-V alloys, the Cr and V elements accumulate in the melting zone and reduce the heat created by combustion.
Highlights
Titanium alloys are widely used in advanced aero engines because of their excellent high specific strength, corrosion resistance and heat resistance [1,2]
The titanium alloy burns violently dazzling white light when the titanium alloy sample heated by a resistance wire reaches the ignition with a dazzling white light when the titanium alloy sample heated by a resistance wire reaches the temperature
The post-combustion Ti-Cr-V alloys consist of three different zones, namely the heat-affected zone, melting zone and oxide zone
Summary
Titanium alloys are widely used in advanced aero engines because of their excellent high specific strength, corrosion resistance and heat resistance [1,2]. Since the titanium alloys have been used in aero engines, the titanium fire accidents have occurred frequently. Once it occurs, the engines and titanium parts are burned out in 2–20 s, with almost no means of extinguishing the fire. The engines and titanium parts are burned out in 2–20 s, with almost no means of extinguishing the fire To fundamentally solve this problem, many researchers have tried to develop new burn-resistant titanium alloys.
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