Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
X- RAY DIFFRACTION STUDY IN MARAGING 300 AGED IN SEVERAL CONDITIONS
Submission Author:
Hugo da Igreja , RJ
Co-Authors:
Hugo da Igreja
Presenter: Hugo da Igreja
doi://10.26678/ABCM.COBEM2019.COB2019-1914
Abstract
The main aim of this work was performing a study of microstructural characterization by X- ray diffraction (XRD) in maraging 300 steel in distinct aging conditions. The austenite volume fraction precipitated versus aging time at 510, 560, 600 and 650°C were determined by using Rietveld Method through Fullproof ® free software. The change of martensite lattice, considering cubic and tetragonal structures, was also analyzed comparing with the residues (χ²) obtained in each condition. The results obtained revealed similar austenite precipitation kinetics behavior, but with a greater amount in high temperatures and aging times in 510, 560 and 600°C interval. Additionally, it was noticed a decrease in the c/a ratio of the martensite lattice parameters, justified by the material aging kinetics and the elements segregation of the supersaturated martensite matrix. In addition, the analyses have shown the relationship between the aging kinetics progress with the dislocation density and the microstrain of the martensite matrix for each temperature. Finally, this work enabled a detailed microstructural characterization in this class of steel, being of great relevance for the evaluation of the mechanical and magnetic behavior during the processing of these materials.
Keywords
maraging steels, Phase quantification, Lattice parameters, Dislocation density, Microstrain
