Twin boundary fatigue crack nucleation in a polycrystalline Nickel superalloy containing non-metallic inclusions

2022 ◽  
pp. 104785
Author(s):  
Alexander Bergsmo ◽  
Yilun Xu ◽  
Benjamin Poole ◽  
Fionn PE Dunne
Keyword(s):  
Fatigue Crack ◽  
Twin Boundary ◽  
Crack Nucleation ◽  
Nickel Superalloy ◽  
Polycrystalline Nickel ◽  
Fatigue Crack Nucleation ◽  
Metallic Inclusions

scholarly journals Slip localization and fatigue crack nucleation near a non-metallic inclusion in polycrystalline nickel-based superalloy

2015 ◽  
Vol 641 ◽  
pp. 328-339 ◽  
Author(s):  
Tiantian Zhang ◽  
Jun Jiang ◽  
Barbara A. Shollock ◽  
T. Ben Britton ◽  
Fionn P.E. Dunne
Keyword(s):  
Fatigue Crack ◽  
Crack Nucleation ◽  
Metallic Inclusion ◽  
Polycrystalline Nickel ◽  
Fatigue Crack Nucleation ◽  
Nickel Based Superalloy

scholarly journals Micromechanical Modeling of Fatigue Crack Nucleation around Non-Metallic Inclusions in Martensitic High-Strength Steels

Metals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1258 ◽  
Author(s):  
Benjamin Schäfer ◽  
Petra Sonnweber-Ribic ◽  
Hamad ul Hassan ◽  
Alexander Hartmaier
Keyword(s):  
Fatigue Crack ◽  
Crack Nucleation ◽  
Micromechanical Model ◽  
High Strength Steels ◽  
High Strength ◽  
Fatigue Crack Nucleation ◽  
Metallic Inclusions ◽  
Microstructural Defects ◽  
Loading Axis ◽  
Inclusion Matrix

Martensitic high-strength steels are prone to exhibit premature fatigue failure due to fatigue crack nucleation at non-metallic inclusions and other microstructural defects. This study investigates the fatigue crack nucleation behavior of the martensitic steel SAE 4150 at different microstructural defects by means of micromechanical simulations. Inclusion statistics based on experimental data serve as a reference for the identification of failure-relevant inclusions and defects for the material of interest. A comprehensive numerical design of experiment was performed to systematically assess the influencing parameters of the microstructural defects with respect to their fatigue crack nucleation potential. In particular, the effects of defect type, inclusion–matrix interface configuration, defect size, defect shape and defect alignment to loading axis on fatigue damage behavior were studied and discussed in detail. To account for the evolution of residual stresses around inclusions due to previous heat treatments of the material, an elasto-plastic extension of the micromechanical model is proposed. The non-local Fatemi–Socie parameter was used in this study to quantify the fatigue crack nucleation potential. The numerical results of the study exhibit a loading level-dependent damage potential of the different inclusion–matrix configurations and a fundamental influence of the alignment of specific defect types to the loading axis. These results illustrate that the micromechanical model can quantitatively evaluate the different defects, which can make a valuable contribution to the comparison of different material grades in the future.

Low-Cycle fatigue crack nucleation and early growth in Ti-17

1978 ◽  
Vol 9 (8) ◽  
pp. 1159-1167 ◽  
Author(s):  
A. W. Funkenbusch ◽  
L. F. Coffin
Keyword(s):  
Fatigue Crack ◽  
Crack Nucleation ◽  
Low Cycle Fatigue ◽  
Early Growth ◽  
Cycle Fatigue ◽  
Fatigue Crack Nucleation
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