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Questions related from S. N. Ojha
This is related to the configuration of atoms generating the tetrahedron and octahedron packing. The octahedron voids are more in austenite compared to that in ferrite.
09 September 2014 1,550 7 View
the thermodynamic limit of hydrogen removal is 1 ppm which has not been achieved by any degassing technique as yet.
09 September 2014 9,342 1 View
Niobium raises recrystallization temperature of steels more effectively than any other metals and consequently facilitates controlled rolling leading to grain refinement of ferrite.
09 September 2014 589 10 View
In metal foam each pore collapses one after another to generate high crash resistance unlike yielding and plastic flow of solid metal.
09 September 2014 6,747 7 View
The correct sequence is to add weaker to stronger deoxidizers. Accordingly, the ferro-manganese is added first followed by ferro-silicon and then Al in the last.
09 September 2014 6,333 18 View
The energy barrier for heterogeneous nucleation is always less than that of the energy barrier for homogeneous nucleation process as a result the heterogeneous nucleation rate is always high.
09 September 2014 4,580 9 View
One of the reasons is segregation of Mn in the inter-dendritic region. During hot rolling, the Mn enriched region reduces the activity of carbon and gives rise to more pearlite, in contrast to...
09 September 2014 1,401 3 View
Titanium and Zirconium are used for grain refinement because they form intermetallics that act as good nucleation cite for crystallization of the melt. The large nucleation cite provides space...
09 September 2014 2,029 0 View
The rheocasting is a process of creating a semi-solid slurry followed by its pushing into a metal mold for freezing. In thixocasting, the slurry freezes to fully solid phase which is again heated...
09 September 2014 1,645 5 View
