Super Duplex CE8MN - Saveable or not?
Super Duplex CE8MN - Saveable or not?
(OP)
Dear all,
I got a Super duplex stainless steel CE8MN and although composition seems in spec the ratio of ferrite to austenite is nowhere near 50-50.
Take a look at the micrograph. Etchant is Murakami which colors the Ferrite. I would say that I see 20-30% Ferrite which as you understand will cause reduced mechanical properties that are out of spec.
The castings have been heat treated with a resulting hardness of 260HV.
Q: Is it possible to alter the % ferrite to austenite ratio by tailoring the heat treatment? Or am I stuck with the schaeffler diagram which is based on the composition.?
Thanks,
Herc
I got a Super duplex stainless steel CE8MN and although composition seems in spec the ratio of ferrite to austenite is nowhere near 50-50.
Take a look at the micrograph. Etchant is Murakami which colors the Ferrite. I would say that I see 20-30% Ferrite which as you understand will cause reduced mechanical properties that are out of spec.
The castings have been heat treated with a resulting hardness of 260HV.
Q: Is it possible to alter the % ferrite to austenite ratio by tailoring the heat treatment? Or am I stuck with the schaeffler diagram which is based on the composition.?
Thanks,
Herc





RE: Super Duplex CE8MN - Saveable or not?
Michael McGuire
http://stainlesssteelforengineers.blogspot.com/
RE: Super Duplex CE8MN - Saveable or not?
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"It's better to die standing than live your whole life on the knees" by Peter Mayle in his book A Good Year
RE: Super Duplex CE8MN - Saveable or not?
RE: Super Duplex CE8MN - Saveable or not?
A higher anneal temp with very aggressive cooling will result in higher ferrite levels. If you cool fast enough you will have higher than equilibrium amounts.
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