Shambhu Nath Ojha

5 Questions 6 Answers 0 Followers

Questions related from Shambhu Nath Ojha

Why is solubility of C in ferrite only 0.025% whereas in Austenite this is 2% ?

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.

20 September 2014 7,612 11 View

Can anybody suggest why cells grow with a hexagonal symmetry but dendrites do not?

Three forces in equilibrium makes 120 degrees angle and with this angle a hexagonal symmetry gets generated in 3D whereas the dendritic growth crystallographic driven.

12 September 2014 3,154 1 View

Can someone throw light on the purpose of addition of Niobium in HSLA steels?

Niobium raises recrystallization temperature of steels more effectively than any other metals and consequently facilitates controlled rolling leading to grain refinement of ferrite.

07 September 2014 9,949 10 View

What is thermodynamic limit of removal of hydrogen from the steel melts?

the thermodynamic limit of hydrogen removal is 1 ppm which has not been achieved by any degassing technique as yet.

04 September 2014 8,063 1 View

Which techniques are based on planar interface condition during freezing of the melt?

The growth of single crystal and zone refining of metals requires it to have planar interface condition.

03 September 2014 3,997 2 View