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Red color after Heat treatment

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HaranSR

HaranSR

Materials
Joined
Aug 17, 2017
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We are heat treating 52100 (100Cr6) material with salt quenching.
After heat treatment we are observing red colour (powder like layer) on the surface of the parts.
If i try of wipe of with cloth it gets removed, and it is not like rust.
The process are Prewash ---- 860 C / 2 Hrs --- Salt quench at 230 C / 2 hrs ----- Post wash.
Can anybody suggest what could be the reason for the red colour in the part surface.?
 
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I suspect that it is from your wash.
It may be rust that is being deposited on the surface.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube
 
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Cannot see it being anything other than rust.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."
 
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??? isn't red oxidation on the surface RUST, ???
 
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Carefully remove a sample of the residue and have it analyzed at a local materials testing lab. Easy, quick and definitive.
 
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HaranSR - Rust is a term specific to the oxidation products of iron. Iron oxides and hydroxides come in a wide variety of forms, some of which can be readily identified by appearance.

metengr - X-Ray Diffraction would be the applicable method. It is widely used by rock sample analysis labs (geology/petrology) in case your local met lab does not offer it. I have found it a very useful tool in corrosion failure investigations.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."
 
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