High Temperature Creep Properties of Cast Cobalt-Based Superalloys: A Comparison

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F19%3A00511753" target="_blank" >RIV/68081723:_____/19:00511753 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1007/978-3-030-21894-2_8" target="_blank" >http://dx.doi.org/10.1007/978-3-030-21894-2_8</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/978-3-030-21894-2_8" target="_blank" >10.1007/978-3-030-21894-2_8</a>

Result language

angličtina

Original language name

High Temperature Creep Properties of Cast Cobalt-Based Superalloys: A Comparison

Original language description

Cast cobalt-based superalloys have already found applications in the glass industry to construct glass shaping tools. The present study deals with the high temperature characterization of the two cast cobalt-based CoNb and CoTa superalloys which have been developed for precision casting of a rotary fibreglass spinner disc for glass industry. The superalloys have been characterized through constant load creep tests at 1000, 1050 and 1100 °C in a tensile stress range from 20 to 100 MPa, with the aim to simulate the variation of mechanical properties occurring in a rotary fibreglass spinner disc at operational conditions. The results have been compared and discussed, with the aim to link the difference in creep properties to the evolution of creep damage and fracture in superalloys. It was found that the CoNb superalloy possesses longer creep life compared to the CoTa superalloy under the same loading conditions. Fractographic investigations of the creep fractured specimens of the examined superalloys revealed that the dominating creep fracture of the CoTa is of the ductile transgranular dimple fracture mode due to a loss of an external section of specimen (necking). By contrast, the final brittle fracture in the CoNb superalloys occurs via relatively fast propagation of the longest cracks after the ultimate state of creep damage is reach.

Czech name

—

Czech description

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Type

D - Article in proceedings

CEP classification

—

OECD FORD branch

20501 - Materials engineering

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2019

Confidentiality

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

Article name in the collection

Proceedings of the Second International Conference on Theoretical, Applied and Experimental Mechanics

ISBN

978-3-030-21893-5

ISSN

2522-560X

e-ISSN

—

Number of pages

6

Pages from-to

39-44

Publisher name

Springer Nature

Place of publication

Cham

Event location

Corfu

Event date

Jun 23, 2019

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

000521731000008