High-Pressure Torsion for Pure Chromium and Niobium
نویسندگان
چکیده
منابع مشابه
Numerical Analysis of Severe Plastic Deformation by High Pressure Torsion
High-pressure torsion (HPT) is a metal processing method in which the sample is subjected to a very high plastic shear deformation. This process can produce exceptional levels of grain refinement, and provides a corresponding improvement in mechanical properties. To investigate the stress and strain distribution due to HPT process finite element simulation were conducted to investigate effectiv...
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Two body centered cubic (bcc) metals, V and Mo, were processed by high pressure torsion (HPT) at ambient temperature. Hardness variation as well as microstructural evolution was examined with strain under a pressure of 2 to 6GPa. It was shown that the hardness increases with straining and saturates to a constant level with the grain size of 330–400 nm in V irrespective of the applied pressures....
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Measurements were taken to evaluate the evolution of homogeneity in disks of high-purity aluminum in the early stages of processing by high-pressure torsion. The results demonstrate that samples processed through 1/4 or more whole revolutions exhibit microhardness values which are generally higher in the centers of the disks than at the edges whereas after 1/8 turn the hardness is higher at the...
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High purity polycrystalline niobium contained in boron-epoxy gasket was compressed in a diamond anvil cell (DAC). The pressure was increased in steps of 3 GPa and the diffraction patterns recorded at each pressure with the incident x-ray beam perpendicular to the load axis of the DAC (radial diffraction). The maximum pressure reached was 37.6 GPa. The compressive strength (differential stress) ...
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Modern vehicle bodies make intensive use of high strength steel grades to meet the contradicting demand of lighter weight and simultaneously better mechanical performance. For many steel grades microalloying by niobium is the key to achieve their characteristic property profile. In HSLA steels niobium enhances the strength primarily by grain refinement. In interstitial free high strength steels...
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ژورنال
عنوان ژورنال: MATERIALS TRANSACTIONS
سال: 2012
ISSN: 1345-9678,1347-5320
DOI: 10.2320/matertrans.md201131