4140 surface hardening
4140 surface hardening
(OP)
hi, dear all, i read all your conversation about 4140 steel heat treatment and properties.
here i have a question. it would be appreciated, if somebody answers that?
i have a mold made out of 4140 fr shell sand molding but i want to harden its surface. can you please give me the exact cycle properties such as time for me ?????
o know the temperature 845-830 for austeniting.
thanks
here i have a question. it would be appreciated, if somebody answers that?
i have a mold made out of 4140 fr shell sand molding but i want to harden its surface. can you please give me the exact cycle properties such as time for me ?????
o know the temperature 845-830 for austeniting.
thanks





RE: 4140 surface hardening
Could it be re-heat treated without distortion or cracking being an issue?
How hard is it now?
= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube
RE: 4140 surface hardening
this material (4140) is used as die in which shell sands are shoot to produce core. so, the sand particles erode the die's wall. accordingly, i want to make the die's surface as wear-resistant. to do so,I think i should use carbonizing to harden the die's surface.
is it good treatment?
help me please.
best
RE: 4140 surface hardening
"Even,if you are a minority of one, truth is the truth."
Mahatma Gandhi.
RE: 4140 surface hardening
Unfamiliar with any other way to selectively harden 4140 surface without distortion.
Regards, Wil Taylor
o Trust - But Verify!
o We believe to be true what we prefer to be true. [Unknown]
o For those who believe, no proof is required; for those who cannot believe, no proof is possible. [variation,Stuart Chase]
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion", Homebuiltairplanes.com forum]
RE: 4140 surface hardening
I am with our friend, why use 4140 for this?
We used to make these from resin (epoxy) coated wood, and they made >10,000 cores.
Hardness is one way to resist erosion, coating with something flexible (rubber, urethane) would also do it.
= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube
RE: 4140 surface hardening
RE: 4140 surface hardening
based on ASM vol. 4 i think Carbonitriding is ok with 4140, is not it ?
best