1080 Steel Fine Pearlite
1080 Steel Fine Pearlite
(OP)
I am looking for a Fine Pearlite stucture after a piece of rail is thermite welded. The rail steel is essentially a 1080 Carbon Steel. Specifically the composition is:
Weight Percentage, %
Carbon, C
0.72 - 0.84
Manganese, Mn
0.70 – 1.25
Silicon, Si
0.10 – 1.00
Phosphorus, P
0.02 Max.
Sulphur, S
0.02 Max.
Copper, Cu
0.40 Max.
Chromium, Cr
0.20 – 0.40
Nickel, Ni
0.15 Max.
Molybdenum, Mo
0.05 Max.
Vanadium, V
0.01 Max.
Aluminium, Al
0.01 Max.
Based on a CCT Diagram for 1080 steel it should be cooled from Eutectoid temp of 727°C to 25°C no quicker than 2 minutes and no longer than 166 minutes. Does this make sense. See attached.
Weight Percentage, %
Carbon, C
0.72 - 0.84
Manganese, Mn
0.70 – 1.25
Silicon, Si
0.10 – 1.00
Phosphorus, P
0.02 Max.
Sulphur, S
0.02 Max.
Copper, Cu
0.40 Max.
Chromium, Cr
0.20 – 0.40
Nickel, Ni
0.15 Max.
Molybdenum, Mo
0.05 Max.
Vanadium, V
0.01 Max.
Aluminium, Al
0.01 Max.
Based on a CCT Diagram for 1080 steel it should be cooled from Eutectoid temp of 727°C to 25°C no quicker than 2 minutes and no longer than 166 minutes. Does this make sense. See attached.





RE: 1080 Steel Fine Pearlite
RE: 1080 Steel Fine Pearlite
RE: 1080 Steel Fine Pearlite
RE: 1080 Steel Fine Pearlite
I don't understand a) how is the cooling rate constant?
b)If we take a constant cooling rate of 40C/s, it means that from 730C to 0C, it would take 18.3 seconds. That doesn't match the x-scale which says 10^2.
RE: 1080 Steel Fine Pearlite
RE: 1080 Steel Fine Pearlite
RE: 1080 Steel Fine Pearlite
http