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Red color after Heat treatment

Red color after Heat treatment

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.?

RE: Red color after Heat treatment

I suspect that it is from your wash.
It may be rust that is being deposited on the surface.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

RE: Red color after Heat treatment

Cannot see it being anything other than rust.

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

RE: Red color after Heat treatment

??? isn't red oxidation on the surface RUST, ???

RE: Red color after Heat treatment

Carefully remove a sample of the residue and have it analyzed at a local materials testing lab. Easy, quick and definitive.

RE: Red color after Heat treatment

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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