Influence of Cumulative Plastic Deformation on Microstructure of the Fe-Al Intermetallic Phase Base Alloy

Abstract

This article is part of the research on the microstructural phenomena that take place during hot deformation of intermetallic phase-based alloy. The research aims at design an effective thermo -mechanical processing technology for the investigated intermetallic alloy. The iron aluminides FeAl have been among the most widely studied intermetallics because their low cost, low density, good wear resistance, easy of fabrication and resistance to oxidation and corrosion. There advantages create wide prospects for their industrial applications for components of machines working at a high temperature and in corrosive environment. The problem restricting their application is their low plasticity and their brittle cracking susceptibility, hampers their development as construction materials. Consequently, the research of intermetallic-phase-based alloys focuses on improvement their plasticity by hot working proceses. The study addresses the influence of deformation parameters on the structure of an Fe38% at. Al alloy with Zr, B Mo and C microadditions, using multi -axis deformation simulator. The influence of deformation parameters on microstructure and substructure was determined. It was revealed that application of cumulative plastic deformation method causes intensive reduction of grain size in FeAl phase base alloy.Keywords: FeAl alloys, Max Strain simulator, cumulative plastic deformation, microstructure Prezentowana praca stanowi element prowadzonych badań nad możliwością kształtowania stopów na osnowie faz między-metalicznych z układu Fe-Al drogą obróbki cieplno-plastycznej. Związki międzymetaliczne są traktowane jako przyszłościowe materiały do pracy w wysokich temperaturach i agresywnych środowiskach korozyjnych. Zainteresowanie tą grupą materiałową jest spowodowane dobrymi właściwościami użytkowymi: dobrą odpornością na utlenianie i korozję w środowisku wody morskiej, zużycie ścierne. Ponadto niskie koszty materiałowe stwarzają perspektywy do zastosowań jako alternatywę dla stali odpornych na korozję. Ograniczeniem możliwości szerokiego zastosowania intermetalików z układu Fe-Al, jest ich niedostateczna plastyczność, będąca czynnikiem hamującym ich dalszy rozwój jako materiałów konstrukcyjnych. Stąd badania nad możliwością poprawy plastyczności droga obróbki cieplno-plastycznej. W artykule analizowano wpływ parametrów odkształcania na mikrostrukturę stopu Fe-38% at. Al z mikododatkami cyrkonu, molibdenu, boru węgla. Z wykorzystaniem symulatora Max Strain, który umożliwa kumulację dużych odkształceń w materiale. Przeprowadzono badania mikrostuktury i substruktury wykazały istotny wpływ odkształcania tą metodą na rozdrobnienie ziarn w badanym stopie.

Microstructural and Mechanical Properties of Binary Ti-Rich Fe–Ti, Al-Rich Fe–Al, and Ti–Al Alloys

“…In terms of lightening, it has been shown previously that density decreases with aluminum content [45], which was aimed at in the first place in the choice of our compositions. However, it was previously noted [46] that problems arise in the production of high-aluminum Fe–Al alloys, hence the use of vacuum or powder-metallurgy techniques. These problems include excessive metal oxidation, and the occurrence of significant internal stresses on parts, resulting in cracks and porosities.…”

Intensive multi-axis hot deformation of low carbon steel on the MAXStrain II device

“…The MAXStrain unit has been used, for example, to investigate the controlled microstructure evolution, or to investigate the possibility of grain refinement in Al [5,6], Mg [7] and Ti [4,8] based alloys and also in the case of intermetallic alloys [9]. This technique has also been used to investigate of the grain refinement possibilities of microalloyed steels [3,[10][11][12][13].…”

Determination of the strain value during severe forming on the multi-axis deformation unit MAXStrain II

“…The aim is to achieve the controlled development of the microstructure and the smallest possible average grain size by a suitable choice of test parameters and deformation conditions. Various technical metallic materials were processed in this way, starting with aluminium [2,5] through titanium alloys [6,7], steels and another special alloys [8][9][10][11]. The phenomenon of the "first stress peak" in microalloyed austenitic and ferritic steels was also studied within the MAXStrain issue [12].…”