Damage mechanism and life prediction based on tensile-stress- and compressive-stress-dominated low-cycle fatigue of a directionally solidified Ni-based superalloy DZ445

Published on Jan 10, 2019in Materials Science and Engineering A-structural Materials Properties Microstructure and Processing4.652
· DOI :10.1016/J.MSEA.2018.11.034
Biao Ding3
Estimated H-index: 3
(SHU: Shanghai University),
Weili Ren18
Estimated H-index: 18
(SHU: Shanghai University)
+ 5 AuthorsYunbo Zhong20
Estimated H-index: 20
(SHU: Shanghai University)
Abstract Based on the tensile stress-dominated (strain ratio, R = e min / e max = 0 ) and compressive stress-dominated (R = ∞) low-cycle fatigue (LCF) of a first-generation directionally solidified Ni-based superalloy DZ445 at 900 °C, the paper investigated the contribution of tensile stress and compressive stress to the damage during LCF and creep-fatigue deformation. The results demonstrated that the fatigue life in the case of tensile stress-dominated LCF is about half of that in compressive stress-dominated LCF. Under the case of tensile stress-dominated LCF, the maximum tensile stress was about twice the maximum compressive stress, thus, the tensile mean stress of about 100 MPa occurs. The hysteresis loop showed a very small amount of plastic strain. The transgranular mode and single-source fatigue characteristics were shown in the fracture surface. There were some characteristics of slip bands and cross-slip in the dislocation structures. The stress response in compressive stress-dominated LCF was opposite to that in tensile stress-dominated LCF. The fractograph exhibited mixed transgranular and intergranular modes with plastic characteristics such as dimples and multi-source fatigue characteristics. In addition to the slip bands and cross-slip characteristics, there were also some stacking faults and dislocation networks. The change in fatigue life and stress response could be explained by these microstructure features at both cases well. Based on the above two LCF damage mechanisms, energy-based life prediction model was modified. The data of LCF and creep-fatigue tests at 900 °C was used to verify the prediction accuracy of the modified life prediction model, which was found to have a good prediction accuracy.
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