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Wyniki 1-2 spośród 2 dla zapytania: authorDesc:"rób"

» Ochrona przeciwwybuchowa

rób  
Ochronie przeciwwybuchowej i bezpieczeństwu urządzeń będą poświęcone targi ExploRisk, które odbędą się od 16 do 18 marca br. w Norymberdze. Będą im towarzyszyć jeszcze dwie imprezy targowe: POWTECH - [...] więcej»
w zeszycie ATEST - OCHRONA PRACY 2004/1


 

» Mathematical simulation of deformation behaviour in Equal Channel Angular Rolling process

MICHAL KVAčKAJ  TIBOR KVAČKAJ  ANDREA KOVÁČOVÁ  RÓB ERT KOČIŠKO  JÚLIUS BACSÓ  JAN DUTKIEWICZ  
During the last decade, fabrication of bulk nanostructured metals and alloys using severe plastic deformation (SPD) has been evolving as a rapidly progressing direction of modern materials science that is aimed at developing materials with new mechanical and functional properties for advanced application [1]. The principle of these developments is based on grain refinement down to the nanoscale level in bulk billets using SPD. Ultra-fine grained material produced by IPD are characterized by increased value of strength, fatigue properties and mechanical properties of superplasticity. These properties depend from nanosize grain structure, its distribution in the material, stress, texture and other structural properties. The authors [2] highlighted the important fact, that the evolution of structure during the IPD is not related to the transformation of the microstructure of UFG structure with high angled grain boundaries. After IPD using, nanosize structure polyhedral materials is achieved, by dislocations slides, or dislocations rotations inside grains and slides on grain boundaries [3, 4]. Various processes of intensive plastic deformations have been proposed for the process of drafting the UFG materials using a simple slip. The application of severe plastic deformation (SPD) to conventional polycrystalline metals provides a powerful tool for refine the grain size to the submicrometer or nanometer range [1]. Ultra-fine grained materials (UFG, grain size less than ~1 μm) with unique mechanical and physical properties can be produced by severe plastic deformation [5÷11], such as a noble technique called equal channel angular rolling (ECAR). Lee et al. [12] proposed that Φ can be adjusted from 100° to 140° for producing ultra-fine grains with high angles of mi[...] więcej»
w zeszycie INŻYNIERIA MATERIAŁOWA 2011/2


 

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