Numerical and experimental study on microstructure evolution of Ti-6Al-4 V alloy shaft preform in cross-wedge rolling process

Yuan, Jiayao; Chen, Xing; Zhao, Zhilong; Sun, Bin; Shu, Xuedao

doi:10.1007/s00170-021-08440-1

Cited by 4 publications

(3 citation statements)

References 30 publications

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“…In a subsequent study [ 48 ], they developed a numerical model involving dynamic and static recrystallization kinetics, and the results of the FEM model validation showed high agreement between the experimental and numerical mean grain sizes. In later studies, FEM was employed to determine the distributions of grain size in parts formed by CWR from the following materials: nickel-based superalloy GH4169 [ 49 , 50 ], steel grades 42CrMo [ 51 ] and 25CrMo4 [ 52 , 53 ], aluminum alloy grade 6061 [ 54 ], and titanium alloy grade Ti6Al4V [ 55 ]. In addition to that, Li et al [ 56 ] determined the volume fraction of the α phase in TC6 alloy parts rolled with varying temperature, area reduction, and rotational speed.…”

Section: Microstructure Modelingmentioning

confidence: 99%

The Application of Finite Element Method for Analysis of Cross-Wedge Rolling Processes—A Review

Pater

2023

Materials

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The aim of this article is to review the application of the finite element method (FEM) to cross-wedge rolling (CWR) modeling. CWR is a manufacturing process which is used to produce stepped axles and shafts as well as forged parts for further processing on forging presses. Although the concept of CWR was developed 140 years ago, it was not used in industry until after World War 2. This was due to the limitations connected with wedge tool design and the high costs of their construction. As a result, until the end of the twentieth century, CWR tools were constructed by rolling mill manufacturers as they employed engineers with the most considerable experience in CWR process design. The situation has only changed recently when FEM became widely used in CWR analysis. A vast number of theoretical studies have been carried out in recent years, and their findings are described in this overview article. This paper describes nine research areas in which FEM is effectively applied, namely: the states of stress and strain; force parameters; failure modes in CWR; material fracture; microstructure modeling; the formation of concavities on the workpiece ends; CWR formation of hollow parts; CWR formation of parts made of non-ferrous materials; and new CWR methods. Finally, to show the potential of FEM on CWR modeling, a CWR process for manufacturing a stepped shaft used in car gearboxes is simulated numerically. This numerical simulation example shows that FEM can be used to model very complex cases of CWR, which should lead to a growing interest in this advanced manufacturing technique in the future.

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Section: Microstructure Modelingmentioning

confidence: 99%

The Application of Finite Element Method for Analysis of Cross-Wedge Rolling Processes—A Review

Pater

2023

Materials

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“…Interest in three-dimensional (3D) micromachining is driven by many advanced applications in different fields, such as materials science [ 1 , 2 , 3 , 4 ], biology [ 5 ], and photonics [ 6 , 7 , 8 ]. Many research groups have made great efforts in developing and improving direct writing techniques that can produce 3D objects with a high spatial fidelity and resolution.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Chiral 3D Microstructure Using Tightly Focused Multiramp Helico-Conical Optical Beams

et al. 2022

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Beams with optical vortices are widely used in various fields, including optical communication, optical manipulation and trapping, and, especially in recent years, in the processing of nanoscale structures. However, circular vortex beams are difficult to use for the processing of chiral micro and nanostructures. This paper introduces a multiramp helical–conical beam that can produce a three-dimensional spiral light field in a tightly focused system. Using this spiral light beam and the two-photon direct writing technique, micro–nano structures with chiral characteristics in space can be directly written under a single exposure. The fabrication efficiency is more than 20 times higher than the conventional point-by-point writing strategy. The tightly focused properties of the light field were utilized to analyze the field-dependent properties of the micro–nano structure, such as the number of multiramp mixed screw-edge dislocations. Our results enrich the means of two-photon polymerization technology and provide a simple and stable way for the micromachining of chiral microstructures, which may have a wide range of applications in optical tweezers, optical communications, and metasurfaces.

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“…Zhang et al [ 12 ] also discussed the problem of microstructural changes during cross-wedge rolling in their study. Yuan et al [ 13 ] analysed the microstructural changes in Ti-6Al-4V titanium alloy forgings after the cross-wedge rolling process.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Susceptibility to Material Fracture in the Cross-Wedge Rolling Process with Concave Tools

Bulzak

2022

Materials

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The internal cracking of forgings during the cross-wedge rolling (CWR) process is a serious limitation that prevents the correct implementation of this process. The phenomenon of material cracking in the CWR process reduces the technological and application possibilities of this highly efficient process, which can produce forgings with high geometric accuracy. This article presents the results of rolling forgings at different temperatures. An analysis of the results showed that the size of the resulting material fracture in the CWR process is related to the size of the ovalisation of the cross-section of the forging formed during rolling. On the basis of the observations made, it was proposed to realise the cross-wedge rolling process with concave tools. The use of tools with a concave geometry is intended to reduce the excessive flow of material in the rolling direction, which restrains the formation of the ovalisation of the cross-section of the forging. Numerical simulations were carried out comparing the rolling with flat tools and concave tools with different radii of the curvature. The results show that the use of concave tools reduces the ovality of the cross-section of the forging during rolling and reduces the value of the normalised Cockcroft–Latham (CL) fracture criterion.

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Numerical and experimental study on microstructure evolution of Ti-6Al-4 V alloy shaft preform in cross-wedge rolling process

Cited by 4 publications

References 30 publications

The Application of Finite Element Method for Analysis of Cross-Wedge Rolling Processes—A Review

The Application of Finite Element Method for Analysis of Cross-Wedge Rolling Processes—A Review

Fabrication of Chiral 3D Microstructure Using Tightly Focused Multiramp Helico-Conical Optical Beams

Assessment of the Susceptibility to Material Fracture in the Cross-Wedge Rolling Process with Concave Tools

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