Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 167, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2022.107349
Keywords
Laser remelting; Strength mismatching; Shielding effect; Fatigue life; Nickel-based superalloy
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This study investigated the mechanical properties and fatigue performance of laser melted mismatching nickel-base superalloys through multiscale experiments and computations. It was confirmed that the local strength degradation does not affect the macroscopic stress-strain responses and overall low-cycle fatigue performance due to the stress shielding in the remelting material. The stress shielding mechanism was quantitatively illuminated, and a critical shielding criterion was established.
In the present work, the mechanical properties and fatigue performance of laser melted mismatching nickel -base superalloys were investigated by multiscale experiments and computations. It confirmed that the local strength degradation does not affect the macroscopic stress-strain responses and overall low-cycle fatigue performance due to the stress shielding in the remelting material. The stress shielding mechanism was quantitatively illuminated and the critical shielding criterion was established. Accumulation of cyclic plastic deformations stimulates the cyclic stress softening and complete tensile mean stress relaxation in the remelting material, which significantly decreases the fatigue driving force of the mismatching material.
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