The hot deformation behavior of Ti-5322 alloy are researched at compression temperatures range of 750–1050 °C and strain rate range of 0.01–10 s−1, to optimize its hot workability. Processing map analysis and microstructure observations reveal that the optimal processing parameters of Ti-5322 alloy are temperatures of 750–825 °C and strain rates of 0.01–0.05 s−1, and temperatures of 925–975 °C and strain rates of 0.01–1 s−1. The peak efficiency of power dissipation can reach 40% owing to the transformation from α phase to β phase, spheroidization behavior and dynamic recrystallization of the β phase. The dynamic recrystallization was the primary form of microstructure evolution above 900 °C, while the spheroidization of α phase below 900 °C. The spheroidization of α lamellae can be attributed to the instability of subgrain boundaries appeared in the α phase during hot deformation. The β phase wadges into the α/α subgrain boundary and α/β interface migration induced the α phase spheroidization. In addition, three instability domains are detected in the processing maps, which confirmed by the presence of microstructures with wedge cracking and adiabatic shear bands.
In the field of high-voltage electric equipments, the SF6 gas as insulation material is widely used in various kinds of Gas Insulated Switchgears (GIS). And the decomposition of SF6 gas under discharge would generates various kinds of gases, which may seriously result in worse insulation performance of the high-voltage electric power equipment. Thus, it is an urgent issue to monitoring these gases. However, existing inspection methods still fail to conduct on-line monitoring of SF6 decomposed gases. Aimed to solve this problem, this paper proposes an On-line SF6 decomposed gases monitoring approach based on the Quantum-Cascade Laser Absorption Spectroscopy. In this system, the composition and the concentration of each kind of gas can be obtained by testing the absorption peak value and absorption intensity of the wavelength. Experiment results show that the proposed system is able to perform on-line monitoring of SF6 decomposed gases with high accuracy.
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