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Changes in the State of Heat-Resistant Steel Induced by Repeated Hot Deformation
Lyudmila L. Lyubimova,Roman N. Fisenko,Alexander A. Tashlykov,Roman B. Tabakaev 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.1
This work deals with the problems of structural regeneration by thermal restoration treatment (TRT). Theseinclude the lack of a structural sign showing that TRT is possible, a consensus on TRT modes, the data on thenecessary relaxation depth of residual stresses, or criteria of structural restoration. Performing a TRT withoutsolving these problems may deteriorate the properties of steel or even accelerate its destruction. With this inview, the purpose of this work is to determine experimentally how the residual stress state changes under thermaland mechanical loads in order to specify the signs of the restoration of structure and structural stability. Theobject of this research is unused 12Cr1MoV steel that has been aged naturally for 13 years. Using X-ray dosimetrywith X-ray spectral analysis, we study the distribution of internal residual stresses of the first kind duringthe repeated hot deformation. After repeated thermal deformation, the sample under study transforms from aviscoelastic Maxwell material into a Kelvin-Voigt material, which facilitates structural stabilization. A sign ofthis is the relaxation limit increase, prevention of continuous decay of an α-solid solution of iron and restorationof the lattice parameter.