Fractographical analysis of fatigue failed Cu–2.55Ni–0.55Si alloy

Atapek, Ş. Hakan; Pantelakis, Spiros; Polat, Soner; Chamos, Apostolos; Aktaş, Gülşah

doi:10.1016/j.tafmec.2015.12.015

Cited by 16 publications

(17 citation statements)

References 25 publications

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“…As shown in Figure 7b, the striation pattern could be used to distinguish between fatigue crack initiation and crack propagation, regarded as one of the main features for crack propagation [31]. The length "d" of the rack initiation zone along the crack propagation path was about 20 μm, which confirmed the fatigue crack initiation at the surface/subsurface [29]. Fatigue striations and the secondary crack were observed at the crack propagation zone in Figure 7d,e.…”

Section: Morphology Of the Specimen's Surfacementioning

confidence: 70%

“…The crack propagation path is shown by the arrows in Figure 7a and it also shows the general view of the fracture surfaces [28,29] indicating the areas for (i) crack initiation (CI); (ii) fatigue crack growth, and propagation (CGP), and final fracture (FF). At the end of fatigue crack growth and propagation, the surface of the fracture was rough in Figure 7a.…”

Section: Morphology Of the Specimen's Surfacementioning

confidence: 99%

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Characteristics of Metal Magnetic Memory Testing of 35CrMo Steel during Fatigue Loading

Fan

Dai

et al. 2018

Metals

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Abstract:The fatigue fracture of a drillstring could cause drilling disturbances and some negative impacts (e.g., economic loss) will be brought when restoring the drillstring to functionality. In order to evaluate the effects of the fatigue damage of the drillstring during drilling, a new apparatus, which could monitor the load level in real-time, was built to perform the four-point bending fatigue test on 35CrMo steel, a typical material of drillstrings. Such an apparatus is based on metal magnetic memory (MMM) technology and can acquire the tangential and normal components of MMM signals. Based on the analysis of the change of surface morphology and MMM signals, it was concluded that the variation of MMM signals could be divided into four stages, which are used to accurately describe the fatigue damage process of the drillstring. Additionally, the MMM signal characteristics are introduced to especially evaluate the fatigue damage of the drillstring, including crack initiation. Furthermore, the scanning electron microscopy (SEM) results demonstrated that morphologies of fatigue fracture were related to the variation of MMM signals. Linear fitting results indicated that fatigue crack length had a good linear relationship with the characteristics, so it is feasible to monitor fatigue damage and predict the residual life of a drillstring by using MMM technology.

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Section: Morphology Of the Specimen's Surfacementioning

confidence: 70%

Section: Morphology Of the Specimen's Surfacementioning

confidence: 99%

Characteristics of Metal Magnetic Memory Testing of 35CrMo Steel during Fatigue Loading

Fan

Dai

et al. 2018

Metals

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“…10, the fracture surface had a mixed fracture of dimple and transgranular ruptures in its final fracture region. This study is an extension of our previous report [10] focusing on the fatigue response of a Zr and Cr modified Cu-Ni-Si alloy tested at different stress levels. In the present study, the alloy was subjected to a conventional heat treatment and exhibited higher mechanical properties compared to its cast and forged condition.…”

Section: Resultsmentioning

confidence: 87%

“…The hardness, yield strength and tensile strength values were measured as 215 HV, 520 MPa and 745 MPa, respectively. As similar to our previous investigation on fatigue behaviour of cast and forged alloy (153 HV) having the same composition [10], the aged one was also tested according to ISO 1099 standard. Prior to loading, the specimens were polished to mirror like finish in order to avoid any surface effect on the fatigue behavior of the material under investigation.…”

Section: Experimental Studymentioning

confidence: 95%

“…The enhancement of properties can be attributed to both the formation of nanosized δ-Ni2Si precipitates and their interaction with the dislocations within α-Cu matrix. However, several silicides that exist in the microstructure due to alloying may affect the performance under cycling loading [10]. In this study, it is aimed to introduce the effect of microstructural features on the fatigue fracture morphology of an aged Cu-Ni-Si alloy modified with the addition of both Zr and Cr.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of fatigue failed aged Cu-Ni-Si alloys

et al. 2018

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The precipitation hardenable and non-toxic Cu-Ni-Si alloys are good alternatives to Cu-Be and Cu-Co-Ni-Be alloys due to their high strength and high conductivity that can be attained by not only alloying but also thermo-mechanical routes. In this study, the fractographic analysis was carried out to understand the fatigue failure of aged 2.55Ni-0.55Si-0.25Zr-0.25Cr (wt-%) alloy which is a member of Corson family. In fatigue tests, a constant amplitude loading was applied at a stress ratio (R = σmin/σmax) of -1 and different stress levels (400, 350, 200 and 175 MPa) were used. The fracture response of the alloy was discussed depending on the applied stress levels and microstructural features. It was concluded that (i) Ni,Zr-rich precipitates and Cr-rich precipitates at the grain boundaries caused crack nucleation at all stress levels and (ii) the interaction between Ni-rich silicides and dislocations at lower stress level resulted in localized shearing and fine striations.

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Fatigue fracture of surface-modified layers in 18CrNiMo7-6 carburized steel

Zhang

et al. 2022

Engineering Failure Analysis

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Fractographical analysis of fatigue failed Cu–2.55Ni–0.55Si alloy

Cited by 16 publications

References 25 publications

Characteristics of Metal Magnetic Memory Testing of 35CrMo Steel during Fatigue Loading

Characteristics of Metal Magnetic Memory Testing of 35CrMo Steel during Fatigue Loading

Characterization of fatigue failed aged Cu-Ni-Si alloys

Fatigue fracture of surface-modified layers in 18CrNiMo7-6 carburized steel

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