Hot Processing of Powder Metallurgy and Wrought Ti-6Al-4V Alloy with Large Total Deformation: Physical Modeling and Verification by Rolling

Wojtaszek, M.; Korpała, Grzegorz; Śleboda, Tomasz; Zyguła, Krystian; Prahl, Ulrich

doi:10.1007/s11661-020-05942-7

Cited by 7 publications

(6 citation statements)

References 42 publications

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“…Duplex microstructures possess both good ductility and high strengths compared with other typical microstructures (equiaxed, widmannstatten, and basket-weave microstructures) [15][16][17][18][19]. The duplex microstructures can be induced by typical thermo-mechanical paths [20][21][22][23][24][25][26][27], in particular the aging conditions. Therefore, in recent decades, some studies have contributed to obtaining these considerable microstructures of Ti alloys by solution plus aging treatment [17,22,26].…”

Section: Introductionmentioning

confidence: 99%

Effects of Aging Treatment on the Microstructures and Mechanical Properties of a TC18 Alloy

Zhang,

Lin,

Wang

et al. 2024

Materials

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In the present work, the effects of aging treatment on the microstructures of a TC18 alloy are studied. The influence of aging treatment on the tensile properties and failure mechanisms is systematically analyzed. It is found that the size and morphology of the primary α (αp) phases are insensitive to aging temperature and time. Furthermore, the aging temperature and time dramatically influence the precipitation of the secondary α (αs) phases. Massive αs phases precipitate and gradually coarsen, and finally weave together by increasing the aging temperature or extending the aging time. The variations in αp and αs phases induced by aging parameters also affect the mechanical properties. Both yield strength (YS) and ultimate tensile strength (UTS) first increase and then decrease by increasing the aging temperature and time, while ductility first decreases and then increases. There is an excellent balance between the strengths and ductility. When the aging temperature is changed from 450 to 550 °C, YS varies from 1238.6 to 1381.6 MPa, UTS varies from 1363.2 to 1516.8 MPa, and the moderate elongation ranges from 9.0% to 10.3%. These results reveal that the thickness of αs phases is responsible for material strengths, while the content of α phases can enhance material ductility. The ductile characteristics of the alloy with coarser αs phases are more obvious than those with thinner αs phases. Therefore, the aging treatment is helpful for the precipitation and homogeneous distribution of αs phases, which are essential for balancing the strengths and ductility of the studied Ti alloy.

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Section: Introductionmentioning

confidence: 99%

Effects of Aging Treatment on the Microstructures and Mechanical Properties of a TC18 Alloy

Zhang,

Lin,

Wang

et al. 2024

Materials

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“…Semi-solid powder forming (SSPF), with advantages of fine grains, net shaping, a simple process and so on [1][2][3][4], has been widely used to prepare excellent composites by many researchers in recent years [5][6][7][8]. Semi-solid powder rolling (SSPR) is a kind of SSPF [9][10][11], which is mainly used to produce alloy or composite strips with high performances in the automotive, aerospace, shipbuilding industries and so on [12][13][14]. During SSPR, powder temperature is a very important parameter, which not only determines the liquid fraction and the material deformation resistance but also affects the solidification and densification process of semi-solid powder materials and, consequently, determines the size and shape, microstructure and mechanical properties of finished products [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Powder Temperature on Semi-Solid Powder Rolling AA2024 Based on Experiments and Numerical Simulation

Wu,

Cai,

Wang

et al. 2023

Metals

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Semi-solid powder rolling (SSPR) is widely used to produce alloy strips with fine grains and excellent performances in the automotive, aerospace and shipbuilding industries. During SSPR, powder temperature, as a very important parameter, greatly affects strips’ microstructures and mechanical properties, which have been investigated by many researchers, but its effect on the forming process and mechanism has rarely been studied. Therefore, based on online experimental detection and transient simulation, the microstructures, strip temperatures, relative densities and rolling forces at different conditions were, respectively, measured, calculated, compared and analyzed in order to study the deformation process and mechanism during SSPR. The result shows that with the increase in powder temperature, the strip temperature and relative density increase, while the rolling force decreases. The grains of the strips are refined after SSPR, and fine and dense microstructures are obtained at 600 °C, which is the optimum powder temperature. In the main deformation sections (II and III), when the contact normal force exists and reaches a maximum, the relative density and rolling force increase rapidly. At these sections, the strips rolled at 600 °C are mainly in a porous solid state, and powder crushing dominates the strip deformation. Therefore, SSPR at 600 °C and below can be considered porous or powder hot rolling, integrating powder crushing, solidification, deformation, densification and grain coarsening. Moreover, as the simulated values are basically consistent with experimental values, the thermomechanical coupling model based on the Fourier equation and its parameters are confirmed to be reasonable.

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“…The temperature of the deformed specimen is measured by thermocouples which are led (through a drilled hole) to the deformed part of the specimen. This ensures accurate sample temperature measurement even with large cumulative strains [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…The MAXStrain unit has been used, for example, to investigate the controlled microstructure evolution, or to investigate the possibility of grain refinement in Al [5,6], Mg [7] and Ti [4,8] based alloys and also in the case of intermetallic alloys [9]. This technique has also been used to investigate of the grain refinement possibilities of microalloyed steels [3,[10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Intensive multi-axis hot deformation of low carbon steel on the MAXStrain II device

Kawulok

HRNČIAR

Schindler

et al. 2022

METAL 2022 Conference Proeedings

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Using the sophisticated MAXStrain II unit, part of the HDS-20 simulator, the effect of intensive cumulative hot deformation on the final structural properties of non-alloyed low carbon steel was investigated. In the case of the MAXStrain II unit, the specimens are deformed by compression in two axes, which allows to achieve large cumulative strains. This fact, together with the possible course of suitable softening processes, represents a potential for research and development of materials with fine-grained structures. The microstructure of all samples of low-carbon alloy steel, deformed at MAXStrain II unit, was composed of a mixture of ferrite and pearlite; in the case of samples after accelerated cooling, hardening components were also detected in the microstructure (share up to 5 %). In all cases, during the MAXStrain II tests, the resulting ferritic grain of the steel under test was refined, with the finest microstructure showing an average ferritic grain size of 6.8 m. The resulting ferritic grain size decreased with decreasing deformation temperature and, in the case of lower overall equivalent strain, also with longer interpass time. However, the chosen cooling rate had a dominant effect on the resulting ferritic grain size.

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Hot Processing of Powder Metallurgy and Wrought Ti-6Al-4V Alloy with Large Total Deformation: Physical Modeling and Verification by Rolling

Cited by 7 publications

References 42 publications

Effects of Aging Treatment on the Microstructures and Mechanical Properties of a TC18 Alloy

Effects of Aging Treatment on the Microstructures and Mechanical Properties of a TC18 Alloy

The Effect of Powder Temperature on Semi-Solid Powder Rolling AA2024 Based on Experiments and Numerical Simulation

Intensive multi-axis hot deformation of low carbon steel on the MAXStrain II device

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