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Statements

Subject Item
n2:RIV%2F68407700%3A21340%2F14%3A00227861%21RIV15-MSM-21340___
rdf:type
n12:Vysledek skos:Concept
dcterms:description
Boriding is a comparatively simple method of achieving ultra-hard surface on metals via thermo-chemical diffusion-based mechanism. For irons, the resulting surface hardness can be in the vicinity of 2000 HVN and, in particular, two distinct crystalline phases, i.e. tetragonal Fe2B, which has three polymorphs with space groups I-4/mcm or I-42m, and orthorhombic FeB (Pbnm) originate in the surface layer penetrated by boron ions. The spatial layout of the phases is usually such that the more brittle FeB is on the surface and the needles in deeper layers are grains of Fe2B. Even though differences in thermal expansion coefficients play an important role, macroscopic residual stresses or their spatial distribution in the altered layer are significant from the viewpoint of the new ultra-hard surface durability. In our contribution, we have studied microstructure, hardness and spatial distributions of both phase composition and residual stresses in samples exhibiting either single phase Fe2B or duplex Fe2B-cum-FeB character. The indispensable knowledge of elastic constants used in stresses calculation from measured deformations by XRD were gained from the refined lattice parameters of both iron borides employing density functional theory implemented in CASTEP software by Material Studio In all studied cases, Fe2B has only minor occurrence of preferred orientation and the evaluated residual stresses have compressive character gradually decreasing from its maximal value on the very surface. However, the pronounced fibre 002 texture of FeB epitomized a hurdle for employment of standard algorithms in XRD stress analysis and called for unorthodox computations which took into account the volume fraction of materiál with texture and the texture quantitative characterization by pole figures and ODF. Boriding is a comparatively simple method of achieving ultra-hard surface on metals via thermo-chemical diffusion-based mechanism. For irons, the resulting surface hardness can be in the vicinity of 2000 HVN and, in particular, two distinct crystalline phases, i.e. tetragonal Fe2B, which has three polymorphs with space groups I-4/mcm or I-42m, and orthorhombic FeB (Pbnm) originate in the surface layer penetrated by boron ions. The spatial layout of the phases is usually such that the more brittle FeB is on the surface and the needles in deeper layers are grains of Fe2B. Even though differences in thermal expansion coefficients play an important role, macroscopic residual stresses or their spatial distribution in the altered layer are significant from the viewpoint of the new ultra-hard surface durability. In our contribution, we have studied microstructure, hardness and spatial distributions of both phase composition and residual stresses in samples exhibiting either single phase Fe2B or duplex Fe2B-cum-FeB character. The indispensable knowledge of elastic constants used in stresses calculation from measured deformations by XRD were gained from the refined lattice parameters of both iron borides employing density functional theory implemented in CASTEP software by Material Studio In all studied cases, Fe2B has only minor occurrence of preferred orientation and the evaluated residual stresses have compressive character gradually decreasing from its maximal value on the very surface. However, the pronounced fibre 002 texture of FeB epitomized a hurdle for employment of standard algorithms in XRD stress analysis and called for unorthodox computations which took into account the volume fraction of materiál with texture and the texture quantitative characterization by pole figures and ODF.
dcterms:title
Study of microstructure, hardness and residual stresses in FeB and Fe2B ultrahard layers Study of microstructure, hardness and residual stresses in FeB and Fe2B ultrahard layers
skos:prefLabel
Study of microstructure, hardness and residual stresses in FeB and Fe2B ultrahard layers Study of microstructure, hardness and residual stresses in FeB and Fe2B ultrahard layers
skos:notation
RIV/68407700:21340/14:00227861!RIV15-MSM-21340___
n4:aktivita
n7:I
n4:aktivity
I
n4:dodaniDat
n10:2015
n4:domaciTvurceVysledku
n15:6539599 n15:6426778 n15:8872511
n4:druhVysledku
n8:O
n4:duvernostUdaju
n16:S
n4:entitaPredkladatele
n6:predkladatel
n4:idSjednocenehoVysledku
48301
n4:idVysledku
RIV/68407700:21340/14:00227861
n4:jazykVysledku
n14:eng
n4:klicovaSlova
Boriding; surface hardening; iron borides; tooth-shaped microstructure; residual stresses
n4:klicoveSlovo
n5:Boriding n5:tooth-shaped%20microstructure n5:surface%20hardening n5:residual%20stresses n5:iron%20borides
n4:kontrolniKodProRIV
[658A5B0B985E]
n4:obor
n11:BM
n4:pocetDomacichTvurcuVysledku
3
n4:pocetTvurcuVysledku
6
n4:rokUplatneniVysledku
n10:2014
n4:tvurceVysledku
Stráský, J. Mušálek, R. Čapek, Jiří Pala, Zdeněk Kyncl, Jiří Fojtíková, Jaroslava
n3:organizacniJednotka
21340