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Rotating Bending Fatigue Behaviors of C17200 Beryllium Copper Alloy at High Temperatures

Authors :
Fuqiang Lai
Kun Mao
Changsheng Cao
Anqiong Hu
Junxiang Tu
Youxi Lin
Source :
Materials, Vol 16, Iss 2, p 815 (2023)
Publication Year :
2023
Publisher :
MDPI AG, 2023.

Abstract

The purpose of this paper is to investigate the fatigue properties of C17200 alloy under the condition of quenching aging heat treatment at high temperatures, and to provide a design reference for its application in a certain temperature range. For this purpose, the tensile and rotary bending fatigue (RBF) tests were carried out at different temperatures (25 °C, 150 °C, 350 °C, and 450 °C). The tensile strength was obtained, and relationships between the applied bending stress levels and the number of fatigue fracture cycles were fitted to the stress-life (S-N) curves, and the related equations were determined. The fractured surfaces were observed and analyzed by a scanning electron microscopy (SEM). The results show that the RBF fatigue performance of C17200 alloy specimens is decreased with the increase in test temperature. When the temperature is below 350 °C, the performance degradation amplitudes of mechanical properties and RBF fatigue resistance are at a low level. However, compared to the RBF fatigue strength of 1 × 107 cycles at 25 °C, it is decreased by 38.4% when the temperature reaches 450 °C. It is found that the fatigue failure type of C17200 alloy belongs to surface defect initiation. Below 350 °C, the surface roughness of the fatigue fracture is higher, which is similar to the brittle fracture, so the boundary of the fracture regions is not obvious. At 450 °C, due to the further increase in temperature, oxidation occurs on the fracture surface, and the boundary of typical fatigue zone is obvious.

Details

Language :
English
ISSN :
19961944
Volume :
16
Issue :
2
Database :
Directory of Open Access Journals
Journal :
Materials
Publication Type :
Academic Journal
Accession number :
edsdoj.b8814ae773eb4e7aba31d9744c7187d3
Document Type :
article
Full Text :
https://doi.org/10.3390/ma16020815