Mössbauer spectroscopy analysis on a tempered martensitic 9% Cr steel

We report an analysis by means of Mössbauer spectroscopy, on a 9% Cr steel submitted to a tempering process at 780°C. Spectra of several samples with different tempering times obtained at room temperature are fitted, and a study on existent phases is made. From the former analysis, we infer the existence of different neighbors of the Fe atom governed by the concentration of alloying elements. In particular, we analyze the behavior of Cr, as the main substitutional atom. An additional measurement of samples at low velocities is made, aiming to reveal the existence of precipitated carbides. Finally a comparison between samples is performed, in order to obtain a detailed study of the effect of tempering time on hyperfine parameters. © Springer Science + Business Media B.V. 2009.Fil: Ramos, Cinthia Paula. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; ArgentinaFil: Sztrajman, Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; ArgentinaFil: Bianchi, R.. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; ArgentinaFil: Danón, C. A.. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; ArgentinaFil: Saragovi, Celia. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentin

Aluminum partitioning during phase separation in Fe-20%Cr-6%Al

Phase separation in a commercial Fe–20 wt.% Cr–6%Al oxide dispersion-strengthened PM 2000 steel has been characterized with a local-electrode atom probe after isothermal aging at 708 Kand 748 Kfor times up to 3,600 h. A progressing decrease in the Al content of the Cr-rich a0 phase was observed with time at both aging temperatures. The Al partitioning trend was consistent with theoretical calculations. However, the experimentally observed Al partitioning factor was significantly lower than the predicted equilibrium value. A *10 nm diameter, roughly spherical, Al- and Ti-enriched b0 Fe(AlTi) phase was also observedSpanish Ministerio de Educación y Ciencia in the form of a Coordinate Project in the Energy Area of Plan Nacional 2006 (ENE2006-15170-C02). Research at the Oak Ridge National Laboratory SHaRE User Facility was sponsored by Basic Energy Sciences, U.S. Department of Energy. PM 2000™ is a trademark of Plansee SEPeer reviewe