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GX40CrNiSi20.14 surface problem

GX40CrNiSi20.14 surface problem

GX40CrNiSi20.14 surface problem

(OP)
Hello everyone,

I have a problem on my casting surface, which I never experienced before.
Cast material specification is GX25CrNiSi20.14.
In the as cast condition; after machining, a surface appeared like in the picture below.

[url=http://postimg.org/image/5bmlxa2bv/][img=http://s33.postimg.org/5bmlxa2bv/20160603_103018.j...][/url]

[url=http://postimg.org/image/4d68uzozv/][img=http://s33.postimg.org/4d68uzozv/20160606_094311.j...][/url]

[url=http://postimg.org/image/vjo3bsqq3/][img=http://s33.postimg.org/vjo3bsqq3/20160606_094329.j...][/url]


The order is cast in 4 melt charges.
All charges have the same problem.
Melt is prepared in 500kg induction furnace, cast in a cold setting resin mould.

Any comments will be appreciated.

Thanks

RE: GX40CrNiSi20.14 surface problem

Can you tell more about the resin sand system and the coating used. What is the solvent used in the coating?


"Even,if you are a minority of one, truth is the truth."

Mahatma Gandhi.

RE: GX40CrNiSi20.14 surface problem

(OP)
It is a phenolic resin system, silica sand is used in the mould. Zr coating is applied, solvent is isopropyl alcohol (IPA).

RE: GX40CrNiSi20.14 surface problem

(OP)
Also i tried heat treating today, water quench from 1050C. Nothing changed.

RE: GX40CrNiSi20.14 surface problem

The defect you see, is due to metal mould reaction. Possibly your resin or IPA needs to be checked.

Did you try pouring the same casting in a CO2/Sodium silicate system.


"Even,if you are a minority of one, truth is the truth."

Mahatma Gandhi.

RE: GX40CrNiSi20.14 surface problem

(OP)
Thanks arunmrao.

I didn't try with sodium silicate system, it doesn't look possible with my current moulding system.

I have some concerns from IPA, now looking for a place with gas chromatography to test IPA.

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