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Corrosion fatigue lifetime assessment of high-speed railway axle EA4T steel with artificial scratch
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SYSNO ASEP 0544864 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Corrosion fatigue lifetime assessment of high-speed railway axle EA4T steel with artificial scratch Author(s) Hu, Y. (CN)
Wu, S. (CN)
Withers, P.J. (GB)
Cao, H. (GB)
Chen, P. (CN)
Zhang, Y. (CN)
Shen, Z. (GB)
Vojtek, Tomáš (UFM-A) ORCID
Hutař, Pavel (UFM-A) RID, ORCIDNumber of authors 9 Article number 107588 Source Title Engineering Fracture Mechanics. - : Elsevier - ISSN 0013-7944
Roč. 245, MAR (2021)Number of pages 13 s. Language eng - English Country GB - United Kingdom Keywords High cycle fatigue ; Defect-tolerant design ; Crack initiation and propagation ; Stress corrosion cracking ; High-speed railway axles Subject RIV JG - Metallurgy OECD category Materials engineering Method of publishing Open access Institutional support UFM-A - RVO:68081723 UT WOS 000633033100004 EID SCOPUS 85100990592 DOI 10.1016/j.engfracmech.2021.107588 Annotation The effects of environment (in air and 3.5 wt% NaCl solution) and artificially-induced surface scratches are investigated on the fatigue properties of railway EA4T (also called 25CrMo4) alloy steel. This steel is found to be markedly sensitive to the chloride-containing environment, with cracking at stresses two thirds of the in-air fatigue limit (+/-326 MPa) under rotating bending (Wohler) tests. The scratched specimens show even shorter lifetime at stresses below 300 MPa and no fatigue limit is found down to 100 MPa. The fracture surfaces are characterized by the initiation of cracks from multiple sources and intergranular cracking. The fatigue failure of smooth specimens tends to initiate from localized corrosion pitting, while the corrosive environment facilitates crack initiation without pitting for scratched specimens. The fatigue crack growth rate in NaCl solution is slightly higher than that in air. Within the framework of defect-tolerant design, El-Haddad modified Kitagawa-Takahashi (KT) diagrams are constructed to explore the variation in fatigue strength and the defect assessment for both conditions. The modified KT model, which takes the short crack behavior into account, is in better agreement with the experimental results than the original KT diagrams. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2022 Electronic address https://www.sciencedirect.com/science/article/pii/S001379442100059X?via%3Dihub
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