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High temperature fatigue characteristics of P/M and hot-forged W-Re and TZM for X-ray target of CT scanner
Materials & Design ( IF 8.4 ) Pub Date : 2018-01-01 , DOI: 10.1016/j.matdes.2017.10.044
Mohd Azhar Harimon , Yukio Miyashita , Yuichi Otsuka , Yoshiharu Mutoh , Shinichi Yamamoto

Abstract 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.

中文翻译:

CT扫描仪X射线靶材P/M和热锻W-Re和TZM的高温疲劳特性

摘要 通过引入疲劳失效准则为 2 次,在负载控制的四点弯曲下成功评估了层状 W-Re/TZM、块状 W-Re 和块状 TZM 在 1000 °C 下的 X 射线靶材疲劳强度。增加初始依从性。层状 W-Re/TZM 和块状 W-Re 在 1000 °C 下获得的疲劳强度相似,在 106 次循环时分别为 280 MPa 和 290 MPa,而块状 TZM 的疲劳强度为 200 MPa。在1000°C疲劳加载过程中,主要的疲劳损伤将是多个晶间裂纹的形核和扩展,这将导致柔量增加。
更新日期:2018-01-01
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