How do I reduce the efect of macrasegregation of carbon in steel?

[metalbr]

I'm having macrosegregation problems with a 0,3 %wt carbon steel. The diameter of the part is quite thick, 80 mm, so I found carbon percent of 0,28% in the surface and 0,39% in the segregation region (in the center of the part).

 

[TVP]

Can you provide some additional details please, such as type of casting process (I am assuming this is some type of casting), mold material, cooling method, etc.?

 

[metalbr]

It was used no-bake moulding and cooled inside the mould (the mould left in ambient temperature).

 

[CoryPad]

Addressing the solidifcation issues raised by TVP is an important area of work for you. Also, you can investigate post-solidification heat treatment. Homogenizing steels usually takes place at a temperature between 1000 [°]C and 1500 [°]C.

 

[dbooker630]

Is the part made from bar stock? Perhaps the bar was rolled from ingot cast steel. I know steelmaking is much improved but I used to encounter a similar condition in 1050 bar that would cause chevroning after cold extrusion.

 

[arunmrao]

How did you get lower carbon on the surface,when you have processed oin a no bake mold? Normally there should have been a carbon pickup from the carbonaceous products burning.Please recheck your testing.

Let the castings cool in the mold for a longer time,this might help reduce the carbon gradient. There is no substitute for homogenizing,you need to do it for a longer holding times to eliminate the carbon gradient.Are there any other alloying elements also in the steel exhibiting segregation pattern?

I have not failed. I've just found 10,000 ways that won't work." — Thomas Edison
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[EduardoVieira]

This is a question. the problem is a macrosegregation of carbon in centerline of cylinder for process steel casting. steel 0,3% carbon without alloy elements.