Carbide formation in tempering of quenched silicon steel
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Natural aging and tempering at low temperatures (up to 140°C) of single crystals of silicon steel is accompanied by the appearance of interference effects on diffraction patterns, indicating the formation of sections of martensite with elevated carbon concentrations. The carbon concentration in these enriched sections, calculated on the basis of the angle of broadening of the interference effects, amounts to about 3%.
Rebuilding of the sections enriched in carbon into a lattice with hexagonal symmetry is revealed from diffraction patterns in the transformation of interference effects into reflections of ε-carbide and the appearance of other reflections of this phase after tempering at 140°C. When the steel is tempered after quenching, ε-carbide is precipitated at a lower temperature.
At 370–450°C two carbide phases are observed — ε-carbide and cementite; with tempering at 450°C only cementite is found.
KeywordsSilicon Reflection Carbide Martensite Hexagonal
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