For fatigue behavior of Mo and its alloys, Alur and Kumar [62] reported fatigue behavior of molybdenum alloys, Mo2SiB and TZM tested under stress ratio of 0.1 at room
temperature and 1200 °C. Their results indicated that the fatigue strength at room temperature for Mo2SiB was significantly high compared to TZM and the fatigue strength
at 1200 °C for Mo2SiB was significantly high compared to that at room temperature, as
shown in Fig. 1.14. They have also provided detailed literature review of fatigue behavior of Mo and TZM in the same paper, which including fatigue behavior of Mo at room temperature [63–66], and fatigue behavior of TZM up to 950 °C [67–71]. It has been also reported that low cycle fatigue strength of TZM up to high temperatures is superior to that of the Ni-base superalloy 713LC[71,72], as shown in Fig. 1.15.
For fatigue behavior of tungsten and its alloys, Schmunk and Korth have conducted tensile and low cycle fatigue tests of tungsten at 815 °C [73]. They reported that low cycle fatigue strength for as-received tungsten was high compared to recrystallized tungsten not only at room temperature but also at 815 °C, as can be seen in Fig. 1.16, where the recrystallized temperature was 1482 °C. Habainy et al. have conducted stress- and strain-controlled fatigue tests of rolled and forged bulk tungsten at temperatures up to 480 °C [37], where the fatigue endurance limits obtained at 2x106 cycles at 480 °C were 150-175 MPa, as shown in Fig. 1.17.
24
Fig. 1.14 The S-N curves of Mo2SiB alloy at 20 °C and 1200 °C. As a comparison, S-N
curve of TZM at room temperature is shown [62].
Fig. 1.15 The comparison of the fatigue behavior of 713LC alloy and TZM alloy at 850 °C [71].
96
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