The effect of deviations from precise [001] tensile direction on creep of Ni-base single crystal superalloys

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F22%3A00553533" target="_blank" >RIV/68081723:_____/22:00553533 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S1359646221005546?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S1359646221005546?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.scriptamat.2021.114274" target="_blank" >10.1016/j.scriptamat.2021.114274</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The effect of deviations from precise [001] tensile direction on creep of Ni-base single crystal superalloys

Popis výsledku v původním jazyce

Low temperature (1023 K) high stress (800 MPa) tensile creep behavior of the superalloy single crystal ERBO-1 (CMSX-4 type) is investigated. Three loading directions are compared: precise [001] and 15 degrees deviations from [001] towards [111] and [011]. It is found that creep rates (epsilon)over dot scale as (epsilon)over dot([001]->[111]) > (epsilon)over dot ([001]) > (epsilon)over dot([001]->[011]) already in the early stages of creep (epsilon <= 1%), where dislocation network formation and planar fault intersections cannot rationalize the observed rate effects. An analysis based on Peach-Kohler force calculations suggests, that fast creep rates are observed, when dislocations from two octahedral systems, which are required to react and form the leading part of a planar fault ribbon in the gamma'-phase, experience similar driving forces. Creep data, micromechanical calculations and TEM results are in good qualitative agreement. From a technological point of view, the results show that while 15 degrees deviations from [001] towards [011] can be tolerated, deviations towards [111] must be avoided. (C) 2021 The Author(s). Published by Elsevier Ltd on behalf of Acta Materialia Inc.

Název v anglickém jazyce

The effect of deviations from precise [001] tensile direction on creep of Ni-base single crystal superalloys

Popis výsledku anglicky

Low temperature (1023 K) high stress (800 MPa) tensile creep behavior of the superalloy single crystal ERBO-1 (CMSX-4 type) is investigated. Three loading directions are compared: precise [001] and 15 degrees deviations from [001] towards [111] and [011]. It is found that creep rates (epsilon)over dot scale as (epsilon)over dot([001]->[111]) > (epsilon)over dot ([001]) > (epsilon)over dot([001]->[011]) already in the early stages of creep (epsilon <= 1%), where dislocation network formation and planar fault intersections cannot rationalize the observed rate effects. An analysis based on Peach-Kohler force calculations suggests, that fast creep rates are observed, when dislocations from two octahedral systems, which are required to react and form the leading part of a planar fault ribbon in the gamma'-phase, experience similar driving forces. Creep data, micromechanical calculations and TEM results are in good qualitative agreement. From a technological point of view, the results show that while 15 degrees deviations from [001] towards [011] can be tolerated, deviations towards [111] must be avoided. (C) 2021 The Author(s). Published by Elsevier Ltd on behalf of Acta Materialia Inc.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/EF16_025%2F0007304" target="_blank" >EF16_025/0007304: Materiály s vnitřní architekturou strukturované pro aditivní technologie</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Scripta Materialia

ISSN

1359-6462

e-ISSN

1872-8456

Svazek periodika

207

Číslo periodika v rámci svazku

JAN

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

6

Strana od-do

114274

Kód UT WoS článku

000707625400009

EID výsledku v databázi Scopus

2-s2.0-85115171691