Cooling diagram Duplex stainless steel
Cooling diagram Duplex stainless steel
(OP)
Dear All,
Can somebody help me to find the diagram that help me determine the needed cooling rate for duplex stainless steel (A182-F51), Like CCT or phase diagram? Showing melting temperature till room temperature. And can somebody also help me how to find a manner to calculate the needed cooling rate after solution annealing. Suppose we have a forging with dimension 300x300x300mm and we quench it in water at about 20 degree celsius. What is practically possible and what is needed to prevent the growth of intermetallic phases like Nitrides, Sigma an Chi.
All help is appreciated, thanks in advance,
Can somebody help me to find the diagram that help me determine the needed cooling rate for duplex stainless steel (A182-F51), Like CCT or phase diagram? Showing melting temperature till room temperature. And can somebody also help me how to find a manner to calculate the needed cooling rate after solution annealing. Suppose we have a forging with dimension 300x300x300mm and we quench it in water at about 20 degree celsius. What is practically possible and what is needed to prevent the growth of intermetallic phases like Nitrides, Sigma an Chi.
All help is appreciated, thanks in advance,





RE: Cooling diagram Duplex stainless steel
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RE: Cooling diagram Duplex stainless steel
I hope somebody can help me solve the case above!
RE: Cooling diagram Duplex stainless steel
There are several good reference articles and even books on duplex stainless steels;
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http://www.scientific.net/MSF.638-642.2986
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RE: Cooling diagram Duplex stainless steel
Looks like the information that I need. Do you perhaps have a copy for me of these articles. They are asking a large ammount for it. If not I have to buy.
Kind regards,
RE: Cooling diagram Duplex stainless steel
At any practical cooling rate you will get some mixture. The main reason for annealing isn't to fix the A/F ratio but to fix segregation. If you anneal at higher temps you get more ferrite, lower temps more austenite.
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Plymouth Tube
RE: Cooling diagram Duplex stainless steel
Can you explain what will determine the exact annealling temperature? Is it volume, chemical composition, client requirements? When we want a 50/50 A/F structue, how to calculate the correct temperature? Most material spec only gives a minimum!
Thanks
RE: Cooling diagram Duplex stainless steel
All of the equations and CCT diagrams are great but eventually you will need to heat treat the material and do a ferrite point count to see if it is going to work.
Bob
RE: Cooling diagram Duplex stainless steel
RE: Cooling diagram Duplex stainless steel
@BHollands
Our requirements are 40-60% Ferrite. But I guess the producer tries to reach 50/50 am I correct? My question is mostly related to forging. After forging solution annealing and rapid water quenching. I understand that all requirements has to be cheched afterwards. But what determines the correct temperature for solution annealing?
Is raw material for forging of any influence, means Ingot, Slab, Billet? Maybe manner of forging (ratio)?