This article reports the flow stress behaviour of ASTM A335 P92 steel. Uniaxial isothermal compression experiments were conducted to examine the hot deformation behaviour of P92 steel in a Gleeble® 3500 thermal-mechanical simulator. The test conditions were: 0.01-10 s -1 strain rate and 850-1000°C deformation temperature. Constitutive equations and processing maps developed were used to describe the hot deformation process. The results showed that the flow stress-strain curves exhibited a dynamic recovery (DRV) behaviour as the dominant softening mechanism. The flow stress decreased with an increase in the deformation temperature or a decrease in strain rate.Using the Arrhenius equation, the stress exponent and the activation energy values were: 8.0 and 487.56 kJmol -1 , respectively. The correlation between the constructed processing maps and microstructure showed that the optimal process parameters occurred at a lower strain rate in the region of 0.1 s -1 and deformation temperatures of 900-950 °C and 1000 °C for the steel investigated.
In this study, experimental Ti-6Al-1V-3Fe, Ti-4.5Al-1V-3Fe, and Ti-3Fe alloys, as well as commercial Ti-6Al-4V alloy that were scaled up utilizing vacuum induction melting technology, were assessed for corrosion performance in simulated body fluids. The selected simulated body fluids were 0.9 wt% NaCl solution and Hanks balanced salt solution (HBSS). Open circuit potential and linear polarization scans were performed to understand the corrosion performance of the alloys. The surface of the alloys was examined before and after exposure to corrosive solutions using scanning electron microscopy. The results show that all the alloys exhibit good corrosion performance in simulated body fluids. The corrosion rates were less than 0.5 mm/year. Owing to higher corrosion potential and lower corrosion rate, Ti-6Al-1V-3Fe and Ti-4.5Al-1V-3Fe had the best resistance to corrosion in 0.9 wt % NaCl and HBSS, respectively. All the alloys consist of a fully lamellar structure with α and β phases. There was no evidence of severe deterioration on the exposed surface of alloys in the simulated body fluids.
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