Stress-Strain Response and Fatigue Lifetime of EEQ-111 Superalloy in Cyclic Loading at High Temperatures

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F24%3A00582280" target="_blank" >RIV/68081723:_____/24:00582280 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1016/j.prostr.2023.12.016" target="_blank" >http://dx.doi.org/10.1016/j.prostr.2023.12.016</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.prostr.2023.12.016" target="_blank" >10.1016/j.prostr.2023.12.016</a>

Result language

angličtina

Original language name

Stress-Strain Response and Fatigue Lifetime of EEQ-111 Superalloy in Cyclic Loading at High Temperatures

Original language description

The material under investigation was polycrystalline Sulzer’s nickel-based superalloy EEQ-111 which is equivalent to the original nGTD-111 developed in the late 1970s. The EEQ-111 superalloy is typical with coarse polyhedral dendritic grains with an average ngrain size of (2.48 ± 0.87) mm. The microstructure consists of γ channels, a bimodal distribution of nano-sized coherent γ´ nprecipitates, γ/γ´ eutectic, and MC and M23C6 carbides. The proportion of casting defects in the material is minimal due to the napplication of hot isostatic pressing. Low cycle fatigue experiments were executed on solid cylindrical specimens with a gauge nlength and diameter of 15 mm and 6 mm, respectively. A symmetrical push-pull cycling under strain control mode was utilized at n800 °C and 900 °C using servo-hydraulic testing machine MTS 810. Hysteresis loops, fatigue hardening/softening curves, and nfatigue lifetime curves in Coffin-Manson, Basquin, and total strain amplitude representations were obtained. Analysis of fracture nsurfaces and secondary cracks from metallographic sections revealed the preferential initiation sites of fatigue cracks that are nindependent of temperature. In contrast, the fatigue crack propagation is purely transgranular at 800 °C, whereas a mix of ntransgranular and intergranular crack propagation can be found at 900 °C indicating grain boundary weakening.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20501 - Materials engineering

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

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

Article name in the collection

Procedia Structural Intergrity

ISBN

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ISSN

2452-3216

e-ISSN

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Number of pages

11

Pages from-to

154-164

Publisher name

Elsevier

Place of publication

Amsterdam

Event location

London

Event date

Sep 12, 2023

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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