Estudo quali-quantitativo de transformações de fases e de tensão residual via dr-x para tratamentos térmicos aplicados ao aço 1cr 0,5mo

Abstract

A study was carried out with 1Cr 0.5Mo Steel, under the factory conditions and subjected to the Normalization and Tempering thermal treatments, with the objective of analyzing qualitatively and quantitatively the possible correlations between the measured results of Phase transformation and the state of Residual Stress Generated in these processes. The measurement path was the X-ray diffractometer, where the study of Phase transformations was governed by the Rietveld Method (MR) and the Residual Stress Analysis by the Sen² técnica technique. From the aforementioned treatments we analyzed the possible convergences and divergences between the respective results and how these phenomena are influenced. The basic principles and the main parameters and variables involved for the techniques used in this research were analyzed using X-ray Diffraction (XRD), where a work routine for analysis of Phases and TRs in metals, especially the Alloy Cr-Mo. It is concluded that the qualitative and quantitative results obtained by the MR and Sen²ᴪ complement each other, thus, the correlated representation of both techniques considerably broadens the description of the phase and phase state of this steel, in front of the applied thermal treatments. Also, the presence of texture was verified by the association of GOF (MR) results and the reference peak used in the Sen² técnica technique, where this texturing was associated with the annealing and recrystallization processes. It is concluded that the treatments involving stress relief have great capacity for regulation and mediation for the phase transformation results and the Residual Stress state in metals, both qualitatively and quantitatively, respectively, in the study steel.