High temperature fatigue characteristics of P/M and hot-forged W-Re and TZM for X-ray target of CT scanner
| Autor: | Yukio Miyashita, Yoshiharu Mutoh, Yuichi Otsuka, Shinichi Yamamoto, Mohd Azhar Harimon |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Scanner
Materials science 020502 materials Mechanical Engineering Metallurgy Nucleation X-ray Fatigue testing Fatigue damage 02 engineering and technology Bending Intergranular corrosion 021001 nanoscience & nanotechnology 0205 materials engineering Mechanics of Materials Fatigue loading lcsh:TA401-492 lcsh:Materials of engineering and construction. Mechanics of materials General Materials Science 0210 nano-technology |
| Zdroj: | Materials & Design, Vol 137, Iss, Pp 335-344 (2018) |
| ISSN: | 0264-1275 |
| DOI: | 10.1016/j.matdes.2017.10.044 |
| Popis: | The fatigue strengths at 1000 °C of layered W-Re/TZM, bulk W-Re and bulk TZM for x-ray target materials were successfully evaluated under load-controlled four-point bending by introducing a fatigue failure criterion as two-times increase of initial compliance. The obtained fatigue strengths at 1000 °C for layered W-Re/TZM and bulk W-Re were similar and 280 MPa and 290 MPa at 106 cycles, respectively, while that of bulk TZM was 200 MPa. During fatigue loading at 1000 °C, dominant fatigue damage would be multiple intergranular crack nucleation and propagation, which would induce the increase of compliance. The reasonability of the fatigue failure criterion was confirmed by the fatigue process observations and the results of room temperature fatigue tests of the specimens tested at 1000 °C up to the cycles corresponding to the fatigue failure criterion. Keywords: Fatigue strength, High temperature, Fatigue damage, Microstructure-property relationship, Refractory materials |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect