![Darken Darken](/uploads/1/2/5/4/125482968/347089958.png)
![Chemistry Chemistry](/uploads/1/2/5/4/125482968/701888953.jpg)
S.H.Avner, Introduction to Physical Metallurgy, McGraw Hill book co.inc. L.S.Darken and R.W.Gurry, Physical Chemistry of Metals, McGraw- Hill, 1958.
. 223 Downloads. Abstract High carbon steel products must frequently be annealed without decarburization. At annealing temperatures, CO 2 and H 2O readily react with carbon in the steel to form CO and H 2. Hydrogen itself can cause decarb, forming methane. Depending on temperature, the carbon in the steel can be present as cementite or as solute in the α- and γ-iron phase.
Each of the forms requires different atmosphere considerations. The condition of the material to be treated (lubricants, oxides, etc.) and the condition of the annealing furnaces can substantially alter the atmosphere composition in the furnace.
Outside the γ-iron region, annealing is done at nonequilibrium atmosphere conditions. This makes the control of the process difficult. By considering the various conditions and the dynamics of the different reactions, high carbon steel can be annealed without decarburization.