Tempering of quenched carbon steels
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Conclusions
- 1.
We determined the relationship between the amounts of the ε- and χ-carbides and cementite in U8, U10, and U12 steels at 120–600°C.
- 2.
We established the temperature limits within which the carbides are stable: the ε-carbide is formed at low temperatures and is stable up to 200°C; at higher temperatures it decomposes intensely, forming cementite and χ-carbide. The χ-carbide is stable up to 400°C; at higher temperatures it is transformed into cementite. The χ- and χ-carbide decompose completely only as the result of tempering at 600°C.
- 3.
We obtained data which allowed us to ascertain that the compositions of the ε- and χ-carbides are the same and correspond to the stoichiometric formula: Fe9C2.
- 4.
We have given a sequence of reactions which, in our opinion, explain the processes occurring during tempering of quenched high-carbon steels.
Keywords
Carbide Carbon Steel Cementite Temperature Limit Stoichiometric FormulaPreview
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