By the way guys, just one more question. I read somewhere that the microstructure of stainless steel 304 will keep being Austenitic even if I increase temperature because of the composition that stabilizes austenite, the only thing that will change is the formation of carbides and...
@MagBen
Indeed! I have here one fiber (Cr-Al ferritic) that has been cold drawn and since it has an extremely high elastic modulus which results from the cold work, it has a very low CTE.
Yes the samples were rapidly solidified having two different compositions. One 'ME-304' 18Cr8Ni which becomes fully austenitic after rapidly solidification (10^5ºC/s) and 'ME-446' with Cr 23-27% which becomes fully ferritic. This was confirmed after a microstructural analysis where the samples...
Thank you guys for all the information!
@metengr the link you provided talked about fcc austenite having two eletronic states (y0 and y1), each with different densities and with different proportions of atoms that are depedent of temperature. I'm sorry but i couldnt understand the information...
Thank you for the reply.
Following your answer, the APF off BCC is 0.68 and FCC is 0.74. Which means that austenite is more dense than ferrite. Why then does it have more thermal expansion at room temperature? By increasing temperature i can understand that when austenite phase changes to alpha...
I have been working with two types of stainless steels, one austenitic and another ferritic at room temperature, 304 and 446 respectively. They were Rapid Solidified by melt extraction process.
I noticed that they have two completly different thermal expansion values:
304 - around 20x10-6/ºC at...
