Results 251 to 260 of about 33,857 (279)

Strengthening of Nickel Deformed by High Pressure Torsion

Materials Science Forum, 2008
The strength of a deformed metal depends on the content of high angle boundaries, low angle dislocation boundaries and the dislocations between the boundaries. High angle boundaries contribute by Hall-Petch strengthening, whereas for the low angle dislocation boundaries and dislocations between boundaries the strengthening is proportional to the square
Zhang, H.W., Huang, Xiaoxu, Hansen, Niels, Pippan, Reinhard, Zehetbauer, Michael   +4 more
openaire   +2 more sources

New Die Design for High-Pressure Torsion

Materials Science Forum, 2022
A special design of the die was developed, which allows to implement the process of severe plastic deformation by high pressure torsion to deform ring blanks, which will be the starting material for creating high-strength piston rings. A special feature of the die design is the provision of torsion of the deforming tool with constant rectilinear ...
Andrey Volokitin, Irina Volokitina, Evgeniy Panin   +2 more
openaire   +1 more source

Finite Element Analysis of High Pressure Torsion

steel research international, 2013
High pressure torsion (HPT) is an important process for producing ultrafine grained materials, and while numerous experimental investigations of HPT have been carried out, most concentrated on microstructure, texture, or the mechanical properties of the processed materials, while few work has been carried out by using FEM because of extreme mesh ...
Wei, Peitang, Lu, Cheng, Tieu, Kiet, Deng, Guanyu, Wang, Haixia, Kong, Ning   +5 more
openaire   +3 more sources

High Pressure Torsion of Rail Steels

Materials Science Forum, 2006
To study the influence of shear deformation on the evolution of the microstructure and the mechanical strength in rail steels, three steels with different microstructure (two pearlitic, one bainitic) were deformed by High Pressure Torsion (HPT). In order to evaluate in addition the effect of the strain path, a cyclic form of HPT was applied.
F. Wetscher, Bao Hui Tian, Richard Stock, Reinhard Pippan   +3 more
openaire   +1 more source

The equivalent strain in high pressure torsion

Materials Science and Engineering: A, 2014
Abstract The results of experiments carried out by means of high pressure torsion (HPT) are frequently described in terms of the Eichinger “equivalent” strain. When employed in conjunction with equivalent stresses derived using von Mises in conjunction with the Fields and Backofen analysis, the values of the work done/unit volume associated with the ...
Jonas, John J., Ghosh, Chiradeep, Toth, Laszlo S.   +2 more
openaire   +1 more source

Electromechanical high-pressure torsion apparatus

Review of Scientific Instruments, 1977
An apparatus for carrying out torsional shear tests of polymers under hydrostatic pressure environment at variable rotational speeds has been developed and tested. The apparatus is capable of containing pressures up to 7 kilobars and producing rotational speeds to 1000 rpm.
K. D. Pae, A. A. Silano
openaire   +1 more source

Texture evolution of Mg during high-pressure torsion

Journal of Materials Science, 2008
Polycrystalline magnesium of 99.8 wt.% purity was subjected to high-pressure torsion (HPT) at room temperature. A special technique was developed in order to enable HPT of Mg up to very high shear strains of 115 and hydrostatic pressures of 4 GPa. The texture development during HPT was investigated by systematic X-ray texture measurements.
Bonarski, Bartlomiej, Schafler, Erhard, Mingler, Bernhard, Skrotzki, Werner, Mikulowski, Boris, Zehetbauer, Michael   +5 more
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High pressure torsion of intermetallic Zr3Al

Materials Science Forum, 2008
The L12-structured intermetallic compound Zr3Al can be rendered amorphous easily by several techniques. In the present study the structural evolution during high pressure torsion (HPT) was investigated systematically by transmission electron microscopy (TEM) methods.
Geist, David, Rentenberger, Christian, Karnthaler, Hans-Peter   +2 more
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Evaluating the influence of pressure and torsional strain on processing by high-pressure torsion

Journal of Materials Science, 2008
Tests were conducted on an Al-6061 alloy to evaluate the separate effects of the applied pressure and the torsional straining in processing by high-pressure torsion (HPT). The values of the Vickers microhardness were measured after processing and plotted both linearly across the diameters of the disks and as three-dimensional representations.
Xu, Cheng, Horita, Zenji, Langdon, Terence G.   +2 more
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High-Pressure Torsion

2016
This chapter starts with a brief description of the technique and how to calculate the strain induced by high-pressure torsion (HPT). Thereafter, the effect of HPT on different classes of metal hydrides is discussed.
openaire   +1 more source