Title: The effect of carbon addition on the structure and high – temperature strength of Fe3Al – based iron aluminide doped by niobium
Authors: Švec, Martin
Vodičková, Věra
Hanus, Pavel
Keller, Vojtěch
Citation: JIRKOVÁ, Hana ed.; JENÍČEK, Štepán ed. Proceedings PING 2019: modern trends in material engineering: 10.-13.09.2019, Pilsen. 1. vyd. Plzeň: University of West Bohemia, 2019, s. 128. ISBN 978-80-261-0879-5.
Issue Date: 2019
Publisher: University of West Bohemia
Document type: konferenční příspěvek
URI: http://hdl.handle.net/11025/35280
ISBN: 978-80-261-0879-5
Keywords: Fe3Al;aluminidy železa;přídavek niobu a uhlíku;fázová struktura;tepelné zpracování;vysoká teplota;kompresní výnosové napětí
Keywords in different language: Fe3Al;type iron aluminides;niobium and carbon addition;phase structure;heat treatment;high temperature;compression yield stress
Abstract in different language: A structural study as well as the determination of σ0.2 compression yield stress at high temperatures have been performed on the Fe3Al-based iron aluminide doped by Nb (5 at. %) and C (1.5 at.%). The carbon occurrence leads to the formation of three-phase structure. Fe3Al matrix, niobium carbides and (Fe,Al)2Nb Laves phase were observed in the structure of investigated alloys. Precipitates were inhomogeneously distributed in as cast state alloy. The annealing at 1000°C for 50 hours leads to more homogenously distribution of secondary phase particles and also to refinement of grain size. The strengthening mechanism of material at high temperatures was detected as a combination of strengthening by incoherent precipitates (NbC and Laves phase) and a solid solution hardening by Nb atoms. Effect of two reinforcing mechanisms together with homogeneously precipitate’s distribution increase the values of σ0.2 compression yield stress about 50 MPa in whole measured temperature range (600 – 800 °C) in comparison to similar intermetallic’s system Fe-Al-Zr-C. Phase composition of the alloy was studied by means of scanning electron microscopy (SEM) equipped by energy dispersive X-ray spectrometer (EDX). The electron backscattered diffraction (EBSD) was used for phase verification and grain size visualization.
Rights: © University of West Bohemia
Appears in Collections:Proceedings PING 2019: modern trends in material engineering
Proceedings PING 2019: modern trends in material engineering

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