Comparison of the kinetic characteristics of the solid-phase transformation of FCC structures of chromium-nickel alloys Kh30N60M9 and Kh23N65M13 in the temperature range 490–620 °C according to dilatometric analysis and the formula for the amount of stored energy

This article discusses the results of a study of thermal stability of samples of single-phase alloys Kh30N60M9 and Kh23N65M13 for heating conditions of samples at a rate of 5.0 °C/min in argon. The structural states of the alloy samples were obtained by water quenching, the alloy quenching temperatures were 1107 °C and 1135 °C, respectively. Based on the dilatometric analysis of the studied alloys, an estimate was made of the rate of change of the differential coefficient of thermal expansion – 𝛼(𝑇) = 𝑓´(𝑇) = 1/L0(dL/dT), where L0 is the initial length of the sample, T is the temperature, in the temperature range of 490–620 °C. The selection criterion was the smaller value of the change f´(T), which correlates with a lower rate of evolution of the specific enthalpy (stored energy) of the sample, confirming the smaller impact of the applied temperature, determining a more energetically favorable FCC structure of the solid solution of the alloy sample in the temperature range under study. Based on the results of this work, it was established that the structure of the Kh30N60M9 alloy is more stable to temperatures in the range of 490–620 °C, the thermal reaction of solid-phase transformation is less feasible, compared with the structure of the solid solution of the Kh23N65M13 alloy.

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