Changing of microstructure after fire
Changing of microstructure after fire
(OP)
Hello,
Could you give me some advice?
Now I examine structural steel (S235) sample from fired construction.
As I can see there is shperoidisation of perlite and some carbides along grain boundaries. Band structure is disappeared.
Is it really possible this changing after fire (Unfortunately I don't know time, but I think it wasn't too long)?
Thank you in advance.
Could you give me some advice?
Now I examine structural steel (S235) sample from fired construction.
As I can see there is shperoidisation of perlite and some carbides along grain boundaries. Band structure is disappeared.
Is it really possible this changing after fire (Unfortunately I don't know time, but I think it wasn't too long)?
Thank you in advance.





RE: Changing of microstructure after fire
Yes, structural steels can be damaged (microstructure and properties) in a fire.
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P.E. Metallurgy, Plymouth Tube
RE: Changing of microstructure after fire
We have performed only hardness test (due to sample size). Hardness is around 125 HV10. Conversion in Rm (UTS) give acceptable result for steel S235, but as I understand in this case value of Rp0.2 (YS offset 0,2%) would be more significant...
N.B. Could you please give some reference if it is possible?
RE: Changing of microstructure after fire
RE: Changing of microstructure after fire
"If you don't have time to do the job right the first time, when are you going to find time to repair it?"
RE: Changing of microstructure after fire
Yes, you can see a microstructural change like that after a exposure of the steel to high temperatures (ie. fire). I suggest you to read this article.
http://www.ommi.co.uk/etd/eccc/advancedcreep/V6i1x...
Good Luck!
RE: Changing of microstructure after fire
"If you don't have time to do the job right the first time, when are you going to find time to repair it?"