Debrecen vs Szombathelyi Haladas : Hungarian NB I:- Get LIve Here & Video Highlights

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19:00 - 21:00	Hungarian NB I							Live!
			Debrecen	vs.	Szombathelyi Haladas

CONCLUSIONS:Cryo-Rolling

1. In ECAP, the deformation is non uniform along the transverse axis. This is because the skin experiences more shear resistance than the center portion during deformation. Hence, the center portion of the structure is almost completely unaffected to the applied load in the initial stages.
2. The grain refinement is more predominant in Chilled Cast samples as compared to the other cast samples. This is due to higher grain boundary areas causing more refinement in the microstructure during deformation process.
3. The microstructures are prepared at different conditions (chilled, metallic mold and sand castings) showing three to four times increase in grain size from chilled cast to sand cast structure.
4. After two deformations through ECAP, chilled casting and metal mold castings crushed to such an extent that it is very difficult to identify individual grains at 100X magnification. And after four deformations the average grain size reduced to micron levels.

EFFECT OF INTITIAL GRAIN SIZE ON EQUAL CHANNEL ANGULAR PRESSING

During last decade, Equal Channel Angular Pressing [ECAP] has emerged as a widely known procedure for the fabrication of ultra fine-grained metals and alloys. ECAP imposes large plastic strains on billets via a pure shear strain state. Intense plastic strain is introduced into materials without changing the cross sectional area of deformed billets in this technique. The interaction of shear plane with texture and crystal structure plays a primary role in grain refinement. The present work involves in study of initial microstructure on ECAP. Three different samples were prepared through sand casting, chilled casting and normal casting (using metallic mould). These samples were subjected to repeated pressings with a rotation of 1800 in each pass. Representative samples are taken after every two passes from the deformed samples to examine the grain size & shape effects on deformation and the corresponding hardness values are also reported for successive samples.