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The effect of temperature on the lattice constants of martensite and ferrite was studied by synchrotron radiation technique. The results showed that the lattice constants of martensite and ferrite increased gradually with the increase of temperature, but diffraction peaks of martensite showed peak splitting phenomenon, while diffraction peaks of ferrite did not. By the peak fitting process of the {110} and {200} diffraction peaks of martensite, it was found that the lattice constants a and c of martensite gradually increased with the increase of temperature, but the increase rate of lattice constant a was faster than that of c, that is, the squareness of martensite gradually decreases. When the temperature increased to 500℃, the squareness (c/a) of martensite was equal to 1. The variation of lattice constant of ferrite with the temperature was basically the same with that of lattice constant a of martensite, but was different from that of lattice constant c of martensite, showing the nature influence of temperature on the lattice constants of martensite. Besides, based on the analysis of synchrotron radiation data, the quantitative equations of lattice constants of martensite and ferrite with the temperature were established.

Influence of temperature on lattice constants of martensite and ferrite