How can Macrosegregation affects the mechanical properties
How can Macrosegregation affects the mechanical properties
(OP)
What would be the difference betwen the mechanical properties of a sample from the top and other from from the bottom of the ingot, in steel forging ?





RE: How can Macrosegregation affects the mechanical properties
I think advances in process control and better solidification modeling has reduced this effect. I remembeber 20-30 years ago, I'd see 10,000 PSI difference in Q&T yeild strengths between the top and bottom.
I'm guessing your diagram is showing carbon distribution?
rp
RE: How can Macrosegregation affects the mechanical properties
".... This makes the parts from the top higher in hardenss and tensile strength than those from the bottom..."
What about the CHAPPY IMPACT TEST ?
" I'm guessing your diagram is showing carbon distribution? "
YES !
From this paper :
http://
RE: How can Macrosegregation affects the mechanical properties
As you are aware, there is a direct correlation between CVN impact energy and carbon content. As the carbon content increases, the upper shelf decreases in value and typically shifts to the right (meaning the ductile to brittle transition temperature would increase).
RE: How can Macrosegregation affects the mechanical properties
Macrosegregation defect is not the only one to occur in an ingot. There are others, like porosities,inclusions, large columnar grains sometimes cracks which combinedly affect the mechanical properties.
It will be rather too simple to conclude a study based only on macro segrgation effect.
Chocolates,men,coffee: are somethings liked better rich!!
(noticed in a coffee shop)
RE: How can Macrosegregation affects the mechanical properties
The macro seggregation of the other alloying elements will follow that of the carbon, so the areas rich in carbon will also be richer in Cr, Mn, Ni, and, to a lesser extent, Mo. This can affect the hardenability of the material.
rp
RE: How can Macrosegregation affects the mechanical properties
" As you are aware, there is a direct correlation between CVN impact energy and carbon content "
Yes, but don(t forget also the impact of residuals elements;
Sorry but in my samples, i always found that CVN in the top of the ingot are higer than the bottom !!!!! very strange !
RE: How can Macrosegregation affects the mechanical properties
Carbon concentration varying from 0.23 % to 0.45 % is enormous and will have a huge effect on properties.
Regards,
Cory
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RE: How can Macrosegregation affects the mechanical properties
Does the ingot get homogenized before forging?
YES !
" Carbon concentration varying from 0.23 % to 0.45 % is enormous and will have a huge effect on properties. "
it's my forging, just an picture wich show the macrosgregation !
@ Arunmrao
Absolutly, macrosegregation is not the only effect !
But i want to measure the impact of the macrosegregation on the mechnaical properties !
RE: How can Macrosegregation affects the mechanical properties
Regards,
Cory
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.
RE: How can Macrosegregation affects the mechanical properties