Effect of phase separation on tensile and Charpy impact properties of MA956 ODS steel

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F17%3A10370265" target="_blank" >RIV/00216208:11320/17:10370265 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.msea.2017.06.010" target="_blank" >http://dx.doi.org/10.1016/j.msea.2017.06.010</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.msea.2017.06.010" target="_blank" >10.1016/j.msea.2017.06.010</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Effect of phase separation on tensile and Charpy impact properties of MA956 ODS steel

Popis výsledku v původním jazyce

Tensile and Charpy tests were carried out to investigate the effect of phase separation on the mechanical properties of MA956 oxide dispersion strengthened high chromium steel. The ferritic matrix of the investigated material separates into Fe-rich alpha and Cr-rich alpha&apos; phases during thermal ageing at 475 degrees C. The yield stress and tensile strength increased in the aged material due to the formation of the nanometric sized precipitates while the ductility was decreasing with ageing time. The effect of Cr-rich precipitates on the strengthening was estimated using analytical models based on different mechanisms. Modulus strengthening can be considered the most important contribution to the yield strength increase. Charpy properties showed orientation dependence reflecting the anisotropy in the microstructure. The thermally aged MA956 alloy exhibited inferior Charpy impact properties compared to the as-received material. After ageing for 1000 h the ductile-brittle transition temperature (DBTT) was shifted by 200 degrees C to higher temperatures, while the upper shelf energy decreased dramatically. In samples with L-R orientation, crack arrester type delamination was observed which is considered to increase the upper shelf energy as compared to the other orientations.

Název v anglickém jazyce

Effect of phase separation on tensile and Charpy impact properties of MA956 ODS steel

Popis výsledku anglicky

Tensile and Charpy tests were carried out to investigate the effect of phase separation on the mechanical properties of MA956 oxide dispersion strengthened high chromium steel. The ferritic matrix of the investigated material separates into Fe-rich alpha and Cr-rich alpha&apos; phases during thermal ageing at 475 degrees C. The yield stress and tensile strength increased in the aged material due to the formation of the nanometric sized precipitates while the ductility was decreasing with ageing time. The effect of Cr-rich precipitates on the strengthening was estimated using analytical models based on different mechanisms. Modulus strengthening can be considered the most important contribution to the yield strength increase. Charpy properties showed orientation dependence reflecting the anisotropy in the microstructure. The thermally aged MA956 alloy exhibited inferior Charpy impact properties compared to the as-received material. After ageing for 1000 h the ductile-brittle transition temperature (DBTT) was shifted by 200 degrees C to higher temperatures, while the upper shelf energy decreased dramatically. In samples with L-R orientation, crack arrester type delamination was observed which is considered to increase the upper shelf energy as compared to the other orientations.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

<a href="/cs/project/GB14-36566G" target="_blank" >GB14-36566G: Multidisciplinární výzkumné centrum moderních materiálů</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Materials Science &amp; Engineering A: Structural Materials: Properties, Microstructure and Processing

ISSN

0921-5093

e-ISSN

—

Svazek periodika

700

Číslo periodika v rámci svazku

neuveden

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

13

Strana od-do

425-437

Kód UT WoS článku

000406564300049

EID výsledku v databázi Scopus

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