Beyond Ni-base superalloys: Influence of Cr addition on Co-Re base alloys strengthened by nano-sized TaC precipitates

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F18%3A00500178" target="_blank" >RIV/61389005:_____/18:00500178 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.physb.2017.11.059" target="_blank" >http://dx.doi.org/10.1016/j.physb.2017.11.059</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.physb.2017.11.059" target="_blank" >10.1016/j.physb.2017.11.059</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Beyond Ni-base superalloys: Influence of Cr addition on Co-Re base alloys strengthened by nano-sized TaC precipitates

Popis výsledku v původním jazyce

The high-temperature Co-Re alloy [1], a promising candidate for gas turbine applications, has a complex microstructure containing various kinds of precipitates in different size scales. The nano-sized fine spherical TaC (< 100 nm) precipitates are the most important for strengthening of the alloy. In this contribution the influence of Cr addition (5 at.% and 15 at.%) on the strengthening TaC precipitates in Co-Re-Ta-C alloy with a C/Ta ratio of 0.9 is studied. The Cr content is important for the oxidation resistance of the alloy, but it also influences the size and volume fraction of TaC precipitates and consequently the possible formation of the Cr-rich Cr2Re3 (sigma phase) and Cr23C6 precipitates. In addition, Cr influences the temperature of the allotropic phase transformation of the Co matrix phase. It was found that additions of 5 at.% or 15 at.% Cr in the alloy does not result in the formation of Cr2Re3 and Cr23C6 phases. Further, the addition of such smaller amounts of Cr does not retain the Co gamma (fcc) phase (stable or metastable) at room temperature after cooling from high temperatures. Only the e (hcp) phase is present at low temperatures. The TaC precipitates are slightly influenced in size and volume fraction with 5 at.% and 15 at.% Cr.

Název v anglickém jazyce

Beyond Ni-base superalloys: Influence of Cr addition on Co-Re base alloys strengthened by nano-sized TaC precipitates

Popis výsledku anglicky

The high-temperature Co-Re alloy [1], a promising candidate for gas turbine applications, has a complex microstructure containing various kinds of precipitates in different size scales. The nano-sized fine spherical TaC (< 100 nm) precipitates are the most important for strengthening of the alloy. In this contribution the influence of Cr addition (5 at.% and 15 at.%) on the strengthening TaC precipitates in Co-Re-Ta-C alloy with a C/Ta ratio of 0.9 is studied. The Cr content is important for the oxidation resistance of the alloy, but it also influences the size and volume fraction of TaC precipitates and consequently the possible formation of the Cr-rich Cr2Re3 (sigma phase) and Cr23C6 precipitates. In addition, Cr influences the temperature of the allotropic phase transformation of the Co matrix phase. It was found that additions of 5 at.% or 15 at.% Cr in the alloy does not result in the formation of Cr2Re3 and Cr23C6 phases. Further, the addition of such smaller amounts of Cr does not retain the Co gamma (fcc) phase (stable or metastable) at room temperature after cooling from high temperatures. Only the e (hcp) phase is present at low temperatures. The TaC precipitates are slightly influenced in size and volume fraction with 5 at.% and 15 at.% Cr.

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

2018

Kód důvěrnosti údajů

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

Název periodika

Physica. B

ISSN

0921-4526

e-ISSN

—

Svazek periodika

551

Číslo periodika v rámci svazku

12

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

5

Strana od-do

1-5

Kód UT WoS článku

000455012800002

EID výsledku v databázi Scopus

2-s2.0-85034847271