Low-cycle fatigue behaviour of boron-added 9% Cr martensitic steel: Effects of temperature, strain rate, and strain amplitude

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F25%3A00637445" target="_blank" >RIV/68081723:_____/25:00637445 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21220/25:00384523

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S014211232500307X?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S014211232500307X?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ijfatigue.2025.109110" target="_blank" >10.1016/j.ijfatigue.2025.109110</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Low-cycle fatigue behaviour of boron-added 9% Cr martensitic steel: Effects of temperature, strain rate, and strain amplitude

Popis výsledku v původním jazyce

The Low-Cycle Fatigue (LCF) behaviour of a boron-added 9% Cr martensitic stainless steel, COST FB2, was investigated at temperatures of 300 °C, 600 °C, and 650 °C. Mechanical strain amplitudes were prescribed between 3×10⁻³ and 8×10⁻³, with four different strain rates ranging from 3.3¯×10⁻⁵/s to 1×10⁻²/s applied at the higher test temperatures. Cyclic softening was observed under all the investigated loading conditions, driven by a reduction in dislocation density and lath coarsening, which became more pronounced at higher strain amplitudes and temperatures. Investigations into the damage mechanisms revealed transgranular cracking as the predominant failure mode, with the frequency of secondary cracks increasing with strain amplitude. At 600 °C and 650 °C, environmentally assisted cracking and oxidation effects became more significant, especially at higher strain amplitudes and lower loading frequencies. Fatigue lifetime decreased with an increasing temperature and strain amplitude, and a decreasing strain rate. To account for the environmentally assisted cracking effects, a frequency-modified Manson–Coffin model was proposed. This modified model accurately captured the reduction in lifetime at lower mechanical strain rates.

Název v anglickém jazyce

Low-cycle fatigue behaviour of boron-added 9% Cr martensitic steel: Effects of temperature, strain rate, and strain amplitude

Popis výsledku anglicky

The Low-Cycle Fatigue (LCF) behaviour of a boron-added 9% Cr martensitic stainless steel, COST FB2, was investigated at temperatures of 300 °C, 600 °C, and 650 °C. Mechanical strain amplitudes were prescribed between 3×10⁻³ and 8×10⁻³, with four different strain rates ranging from 3.3¯×10⁻⁵/s to 1×10⁻²/s applied at the higher test temperatures. Cyclic softening was observed under all the investigated loading conditions, driven by a reduction in dislocation density and lath coarsening, which became more pronounced at higher strain amplitudes and temperatures. Investigations into the damage mechanisms revealed transgranular cracking as the predominant failure mode, with the frequency of secondary cracks increasing with strain amplitude. At 600 °C and 650 °C, environmentally assisted cracking and oxidation effects became more significant, especially at higher strain amplitudes and lower loading frequencies. Fatigue lifetime decreased with an increasing temperature and strain amplitude, and a decreasing strain rate. To account for the environmentally assisted cracking effects, a frequency-modified Manson–Coffin model was proposed. This modified model accurately captured the reduction in lifetime at lower mechanical strain rates.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

International Journal of Fatigue

ISSN

0142-1123

e-ISSN

1879-3452

Svazek periodika

200

Číslo periodika v rámci svazku

NOV

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

18

Strana od-do

109110

Kód UT WoS článku

001530594400001

EID výsledku v databázi Scopus

2-s2.0-105009265758