Study of microstructure, hardness and residual stresses in FeB and Fe2B ultrahard layers

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F14%3A00227861" target="_blank" >RIV/68407700:21220/14:00227861 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21340/14:00227861

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Study of microstructure, hardness and residual stresses in FeB and Fe2B ultrahard layers

Popis výsledku v původním jazyce

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 ison 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

Název v anglickém jazyce

Study of microstructure, hardness and residual stresses in FeB and Fe2B ultrahard layers

Popis výsledku anglicky

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 ison 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

Druh

O - Ostatní výsledky

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2014

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů