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Ultrasonic Fatigue Device and Behavior of High-Temperature Superalloy Inconel 718 with Self-Heating Phenomenon
| Content Provider | MDPI |
|---|---|
| Author | Zhao, Mengxiong Wu, Tieying Zhao, Zhenhua Liu, Lulu Luo, Gang Chen, Wei |
| Copyright Year | 2020 |
| Description | Ultrasonic resonance fatigue test method at 20 kHz related to the very high cycle fatigue (VHCF) aims to accelerate a time-consuming experiment. In this paper, an ultrasonic fatigue device with a data acquisition system was improved for monitoring and recording the data from fatigue tests in which self-heating phenomenon exists. Symmetric tension-compression sinusoidal vibrating mode (R = −1) was observed in this study. VHCF behavior and mechanism of Inconel 718 were carried out using this device. It was concluded that more than 99% of fatigue life is consumed in initiation duration. Specimen temperature increase was not a decisive factor in VHCF strength for Inconel 718, as long as it was far less than the design temperature limitation. A single initiation site existed at the subsurface facet or grain cluster, observed from scanning electron microscope (SEM) micrographs. Quasi-cleavage fracture in transgranular ductile mode emerged and then tended to trace grain boundaries in an intergranular manner by cleavage-dominated mixed mode. |
| Starting Page | 8761 |
| e-ISSN | 20763417 |
| DOI | 10.3390/app10238761 |
| Journal | Applied Sciences |
| Issue Number | 23 |
| Volume Number | 10 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2020-12-07 |
| Access Restriction | Open |
| Subject Keyword | Applied Sciences Manufacturing Engineering Very High Cycle Fatigue (vhcf) Ultrasonic Inconel 718 Data Acquisition Self-heating Crack Mechanism |
| Content Type | Text |
| Resource Type | Article |
