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- W3048363553 abstract "Abstract The effect of temperature and holding time on the dwell–fatigue crack propagation behavior of a novel tempered martensitic ferritic steel G115 was studied. The crack growth duration greatly increased with the increase in dwell time at all tested temperatures (625–675 °C). The FCG data and the da/dN for the 60-s dwell tests remained nearly constant when the temperature increased from 625 to 650 °C, whereas da/dN increased remarkably when the temperature increased to 675 °C. Moreover, da/dN increased with increasing temperature for the 600-s dwell tests. These results reflect the comprehensive effects of creep, environmental (oxidation) phenomena, and property degradation. In the (da/dt)avg versus (Ct)avg plot, the crack-propagation data under a specific dwell time fall close to each other, regardless of the temperatures. Scanning electron microscopy observation shows that the fatigue crack propagation has a transgranular cracking mode, regardless of variations in the temperature (625–675 °C) and load level. Meanwhile, the creep-fatigue crack growth mode is transgranular cracking at lower Δ K , whereas it gradually changes to mixed intergranular and transgranular fracture modes with increasing Δ K . The longer the holding time, the more significant the intergranular cracking. The crack growth may change to transgranular mode again when Δ K further increases. The two values of Δ K at which the crack-growth mode change all increase with decreasing dwell time and temperature." @default.
- W3048363553 created "2020-08-13" @default.
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- W3048363553 date "2020-10-01" @default.
- W3048363553 modified "2023-09-27" @default.
- W3048363553 title "Temperature effect on dwell-fatigue crack propagation behavior of novel tempered martensitic ferritic steel G115" @default.
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- W3048363553 doi "https://doi.org/10.1016/j.engfracmech.2020.107250" @default.
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