Strengthening mechanisms of different oxide particles in 9Cr ODS steel at high temperatures

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F18%3A00506860" target="_blank" >RIV/68081723:_____/18:00506860 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S1044580318335915?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S1044580318335915?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.msea.2018.06.109" target="_blank" >10.1016/j.msea.2018.06.109</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Strengthening mechanisms of different oxide particles in 9Cr ODS steel at high temperatures

Popis výsledku v původním jazyce

The influence of different oxide particles on deformation mechanisms of 9Cr ODS steels at temperatures 400-600 degrees C is tested. Two ODS variants with Al2O3 and Y2O3 dispersed particles respectively and one variant without particles have been prepared by powder metallurgy. The deformation mechanisms are investigated by the tensile and stress-relaxation test at temperatures 400 degrees C and 600 degrees C. The analysis is based on a comparison of athermal and thermal stress components of the flow stress, apparent activation volume and a strain rate hardening. Microstructural parameters are evaluated upon SEM and TEM observations. The contributions of different strengthening mechanisms are assessed using the Taylor, Hall-Petch, dispersed barrier and Orowan models. Alumina particles provide the highest strengthening which can be explained by the stress decrease around the particles induced by a high difference between Young's moduli of alumina and ferritic matrix. This stress field can trap the dislocation in the vicinity of particles. Due to this stress decrease, alumina particles provide strengthening even at 600 degrees C in contrast to yttria particles that lose their effect due to their overcoming by a non-conservative motion of dislocations.

Název v anglickém jazyce

Strengthening mechanisms of different oxide particles in 9Cr ODS steel at high temperatures

Popis výsledku anglicky

The influence of different oxide particles on deformation mechanisms of 9Cr ODS steels at temperatures 400-600 degrees C is tested. Two ODS variants with Al2O3 and Y2O3 dispersed particles respectively and one variant without particles have been prepared by powder metallurgy. The deformation mechanisms are investigated by the tensile and stress-relaxation test at temperatures 400 degrees C and 600 degrees C. The analysis is based on a comparison of athermal and thermal stress components of the flow stress, apparent activation volume and a strain rate hardening. Microstructural parameters are evaluated upon SEM and TEM observations. The contributions of different strengthening mechanisms are assessed using the Taylor, Hall-Petch, dispersed barrier and Orowan models. Alumina particles provide the highest strengthening which can be explained by the stress decrease around the particles induced by a high difference between Young's moduli of alumina and ferritic matrix. This stress field can trap the dislocation in the vicinity of particles. Due to this stress decrease, alumina particles provide strengthening even at 600 degrees C in contrast to yttria particles that lose their effect due to their overcoming by a non-conservative motion of dislocations.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Materials Science and Engineering A-Structural materials

ISSN

0921-5093

e-ISSN

—

Svazek periodika

732

Číslo periodika v rámci svazku

AUG

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

8

Strana od-do

112-119

Kód UT WoS článku

000441486100015

EID výsledku v databázi Scopus

2-s2.0-85049425702