°Define
full annealing Heating steel to elevated temperature and holding in the same temp for some time limit and cooling very solely in furnace or in insulated condition.
Define normalizing
Heating steel 50 °C to 60 °C above that of its critical temperature and holding in the same temp for some time limit and cooling in still air.
When annealing process preferred
To improve ductility ( to soften )
Remove gases in void
Improve machinability
To bring definite micro structure
Relieve internal stresses due to previous working like rolling, forging and abrupt cooling
Normalized and annealed cooling of low carbon steel
Cooling rate is fast in normalizing than annealing so micro structure is finer than annealing in normalizing process which will give strangeness better than annealed low carbon steel.
Explain conventional normalizing treatment for hyper eutectoid steel
This has carbon > 0.8 % hence heated above critical temp to a range of 50 to 60 °C above ACM line (upper critical temperature 273 °C holding in the same temp for some time limit and cooling in still air.C
Define normalizing
Heating steel 50 °C to 60 °C above that of its critical temperature and holding in the same temp for some time limit and cooling in still air.
When annealing process preferred
To improve ductility ( to soften )
Remove gases in void
Improve machinability
To bring definite micro structure
Relieve internal stresses due to previous working like rolling, forging and abrupt cooling
Normalized and annealed cooling of low carbon steel
Cooling rate is fast in normalizing than annealing so micro structure is finer than annealing in normalizing process which will give strangeness better than annealed low carbon steel.
Explain conventional normalizing treatment for hyper eutectoid steel
This has carbon > 0.8 % hence heated above critical temp to a range of 50 to 60 °C above ACM line (upper critical temperature 273 °C holding in the same temp for some time limit and cooling in still air.C