Abstract
In this study, the microstructure and texture evolution of hot rolled Ti80 pipe annealing at 960°C and 990°C in α+β two-phase field have been investigated. The results showed that the dissolution of α phases induced the increase of texture components of primary α phases (αP) and the αP were the main factors that determine the final texture at 960°C. At 960°C, the microtextures of secondary α phases (αS) were very close to that of αP. As the annealing temperature increased to 990 °C, the main factors affecting the microtextures of αS changed from the αP to the recrystallized β grains. The textures of β phases were greatly influenced by the annealing temperature. The β phases at high temperature were not mainly from the grow up of residual β phases. It was formed by the transformation of α phases at room temperature. Consequently, this study could provide some ideas for decreasing the texture intensities of hot rolled Ti80 pipes, such as reducing the area of α colonies before rolling, scattering the crystal orientations of αP, and controlling the size of recrystallized β grains.
Highlights
The near α titanium and its alloys are widely used for structural applications in aerospace, energy related, and marine engineering fields because of their low density, high toughness, high specific strength and good corrosion resistance[1,2,3]
As the annealing temperature increased to 990 °C, the content of the α phases (αP) decreased from 20% to 9%, and the average size of the recrystallized β grains increased from 30 ± 6 μm to 80
A study has been conducted to understand the evolution of microstructure and texture of hot-rolled Ti80 pipe during heat treatment
Summary
The near α titanium and its alloys are widely used for structural applications in aerospace, energy related, and marine engineering fields because of their low density, high toughness, high specific strength and good corrosion resistance[1,2,3]. To obtain a good balance between strength and ductility, the bimodal microstructures composed of equiaxed primary α phases (αP) and lamellar secondary α phases (αS) are good candidates[4]. It is well known that the mechanical properties including strength, fracture toughness, ductility and fatigue performance are greatly affected by microstructure morphology[5,6,7]. Increase of the volume fraction of αP could improve the tensile properties and high cycle fatigue performance, but decrease the fracture toughness for bimodal microstructure. Texture is an important factor affecting the mechanical properties of titanium alloy pipes. It is necessary to study the mechanism of microtextures in Ti80 pipes
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