Study on Hot Deformation Behavior and Microstructure Evolution of Ti55 High-Temperature Titanium Alloy

Wu, Fengyong; Wang, Xu; Jin, Xueze; Zhong, Xunmao; Wan, Xingjie; Shan, Debin; Guo, Bingbing

doi:10.3390/met7080319

Cited by 19 publications

(17 citation statements)

References 33 publications

(36 reference statements)

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“…The hot deformation activation energy of SP-700 alloy in the α + β region was higher than in the single-phase β region (305 kJ•mol −1 vs. 165 kJ•mol −1 ) due to the dynamic globularization of the lamellar α phase [60]. A similar increase in Q value due to the formation of the α phase was observed for several titanium alloys: 495 kJ•mol −1 in the α + β region vs. 196 kJ•mol −1 in the β region for a Cu-bearing antibacterial Ti-645 alloy [61], 453 kJ•mol −1 vs. 280 kJ•mol −1 for a Ti-55 high-temperature alloy [62], 617 kJ•mol −1 vs. 149 kJ•mol −1 for a TC8M-1 alloy [63], 589 kJ•mol −1 vs. 226 kJ•mol −1 a TA15 alloy [64], 292 kJ•mol −1 vs. 180 kJ•mol −1 for a Ti-5Al-5Mo-5V-1Cr-1Fe alloy [65], 275 kJ•mol −1 vs. 148 kJ•mol −1 for a Ti-5Al-5Mo-5V-3Cr-1Zr alloy [66].…”

Section: Hot Deformation Activation Energysupporting

confidence: 68%

Hot Deformation Behaviour of Mn–Cr–Mo Low-Alloy Steel in Various Phase Regions

Schindler

Opěla

Kawulok

et al. 2020

Metals

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The deformation behaviour of a coarse-grained as-cast medium-carbon steel, alloyed with 1.2% Mn, 0.8% Cr and 0.2% Mo, was studied by uniaxial compression tests for the strain rates of 0.02 s−1–20 s−1 in the unusually wide range of temperatures (650–1280 °C), i.e., in various phase regions including the region with predominant bainite content (up to the temperature of 757 °C). At temperatures above 820 °C, the structure was fully austenitic. The hot deformation activation energies of 648 kJ·mol−1 and 364 kJ·mol−1 have been calculated for the temperatures ≤770 °C and ≥770 °C, respectively. This corresponds to the significant increase of flow stress in the low-temperature bainitic region. Unique information on the hot deformation behaviour of bainite was obtained. The shape of the stress-strain curves was influenced by the dynamic recrystallization of ferrite or austenite. Dynamically recrystallized austenitic grains were strongly coarsened with decreasing strain rate and growing temperature. For the austenitic region, the relationship between the peak strain and the Zener–Hollomon parameter has been derived, and the phenomenological constitutive model describing the flow stress depending on temperature, true strain rate and true strain was developed. The model can be used to predict the forming forces in the seamless tubes production of the given steel.

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Section: Hot Deformation Activation Energysupporting

confidence: 68%

Hot Deformation Behaviour of Mn–Cr–Mo Low-Alloy Steel in Various Phase Regions

Schindler

Opěla

Kawulok

et al. 2020

Metals

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“…Moreover, the authors also emphasize a need for further experimental research for validation of their conclusions. Wu et al as well as Yang et al [19,20] indicated similar results in predicting the hot workability of Ti-55 high-temperature titanium alloy and for high strength automobile steel Docol 1500 Bor using an approach proposed by Prasad and Murty. Lypchanskyi et al [21] investigated the hot deformation behavior of Ti-6Al-2Sn-4Zr-6Mo alloy using processing maps based on the Malas's criterion.…”

Section: Introductionmentioning

confidence: 80%

The analysis of flow behavior of Ti-6Al-2Sn-4Zr-6Mo alloy based on the processing maps

et al. 2020

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The paper presents the analysis of hot deformation behavior of Ti-6Al-2Sn-4Zr-6Mo (Ti-6246) alloy using the theory of dynamic material modeling (DMM) based on hot compression tests performed to a total true strain of 1 at the strain rates from 0.01 to 100 s −1 and at the temperatures within the range between 800 and 1100°C. The processing maps according to the Prasad's criterion were developed. The analysis of the processing maps allowed for the placement of domains describing the areas of potentially favorable combinations of hot deformation parameters. The microstructure observations of the investigated alloy specimens after hot deformation in stability and instability areas were conducted. The optimal processing parameters for numerical modeling of Ti-6246 alloy forging were selected based on processing maps. After complex analysis of the obtained results, microstructural observations and numerical modeling of forging of selected part, the forging tests of Ti-6246 alloy were realized. The obtained product quality assessment was carried out by computed tomography non-destructive testing.

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“…Another important and specific industrial application of Ti55 alloy 46 was studied to predict the instability parameters using Prasad's instability criterion (i.e. DMM) (Supplementary Figure 27(a)) and Murty's instability criteria (i.e.…”

Section: Analysis Through Processing Mapmentioning

confidence: 99%

Hot deformation behaviour of Ti alloys: A review on physical simulation and deformation mechanisms

Yadav

Saxena

Sehgal³

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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Titanium and its alloys, owing to their properties like high strength, toughness, corrosion resistance and thermal stability, are employable in various engineering and medical applications. The properties of titanium alloys depend upon the processing routes and their final microstructure. Therefore, the present review paper compiles the deformation behaviour of various alloys during hot deformation using a physical simulation. Subsequently, the flow stresses are analysed and utilized to develop the processing maps and the constitutive equations that are advantageous for predicting deformation mechanisms during the hot deformation. Specific features reported in the flow stress curves include work hardening, flow softening and steady-state behaviour. In certain cases, the yield point drop and oscillatory behaviour or serrations are also observed. Softening and oscillatory behaviour is an indicator of either dynamic recrystallization or flow-instability, whereas yield discontinuity signifies locking and unlocking of dislocations. In the processing maps, high power dissipation efficiency, η, reveals safe processing conditions, and the η value higher than 40% demonstrates dynamic recrystallization or globularization in the deformed microstructure, whereas the instability domain expresses shear band, flow localization, void formation and wedge cracks in the deformed microstructure. Amongst all the constitutive equations, the Arrhenius-type hyperbolic sine equation is the most suitable for Ti alloys for calculating flow stress and predicting dominant deformation mechanism using activation energy Q and stress exponent n.

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Study on Hot Deformation Behavior and Microstructure Evolution of Ti55 High-Temperature Titanium Alloy

Cited by 19 publications

References 33 publications

Hot Deformation Behaviour of Mn–Cr–Mo Low-Alloy Steel in Various Phase Regions

Hot Deformation Behaviour of Mn–Cr–Mo Low-Alloy Steel in Various Phase Regions

The analysis of flow behavior of Ti-6Al-2Sn-4Zr-6Mo alloy based on the processing maps

Hot deformation behaviour of Ti alloys: A review on physical simulation and deformation mechanisms

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