Image-based numerical simulation of the local cyclic deformation behavior around cast pore in steel

Qian, Lihe; Cui, Xiaona; Liu, Shuai; Chen, Minan; Ma, Penghui; Xie, Honglan; Zhang, Fucheng

doi:10.1016/j.msea.2016.10.017

Cited by 4 publications

(2 citation statements)

References 28 publications

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“…3D characterisation of carbides and pores thus provides a more accurate investigation of the role and effect of carbides and pores in fatigue crack initiation. Based on the 3D characterisation of carbides and pores, image-based FE modelling can be conducted to simulate the stress and strain response of the carbides/pores-containing specimens upon monotonic or cyclic loading, and to assist understanding and prediction of the failure processes related to the pores and carbides [23,24,47]. As shown in this study, by combining the experimental study with image-based modelling (Figs.…”

Section: Discussionmentioning

confidence: 99%

Strain accumulation and fatigue crack initiation at pores and carbides in a SX superalloy at room temperature

Jiang

Bull

Evangelou

et al. 2018

International Journal of Fatigue

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Pores and carbides inherited from SX superalloy manufacturing processes usually act as stress concentrators and are preferential sites for fatigue crack initiation. In this study, pore & carbide size, morphology and distribution in a SX superalloy MD2 has been evaluated by X-ray CT. Strain accumulation and fatigue cracking behaviour in MD2, particularly around the pores and carbides, has been investigated by ex-situ SEM-DIC at room temperature along with image-based modelling of the observed MD2 defect populations obtained through X-ray CT imaging. The deformation structures have also been examined by electron channelling contrast imaging under controlled diffraction conditions. The results indicate that the pores & carbides with complicated three-dimensional features are the dominant fatigue crack initiation sites. Deformation is concentrated within intense slip bands and an enhanced strain accumulation around pores is captured by SEM-DIC. Dislocation motion is mainly confined to the γ matrix channels with some dislocation shear cutting of γʹ precipitates also observed ahead of the crack tip. As the crack propagates, strain band density and dislocation density at the crack tip increases correspondingly. Image-based modelling using the observed defect populations in MD2 (micro)structure can effectively predict the stress concentrations and the resultant hot spot for subsequent fatigue crack initiation, which is consistent with the experimental observations.

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Section: Discussionmentioning

confidence: 99%

Strain accumulation and fatigue crack initiation at pores and carbides in a SX superalloy at room temperature

Jiang

Bull

Evangelou

et al. 2018

International Journal of Fatigue

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“…It has been validated that inherent defects such as an individual large-sized pore, multiple linked pores, and clustered pores near the surface will induce severe stress concentration as fatigue cracking sites in casting alloys, AMed parts, and fusion welds. 9,12,24,41,42 This study also attempts to explore the fatigue cracking behavior of hybrid laser welded joints based on in situ fatigue loaded SR-μCT, as illustrated in Figure 8. As it clearly shows, the size and location of porosity play a crucial role in the crack initiation.…”

Section: Fatigue Cracking Due To Poresmentioning

confidence: 99%

Fatigue behaviors of laser hybrid welded AA7020 due to defects via synchrotron X‐ray microtomography

Song

Ding³

et al. 2019

Fatigue Fract Eng Mat Struct

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Defect or shrinkage is known to have a detrimental effect on the fatigue resistance of casting lightweight alloys and additively manufactured or 3D printed materials. However, very few works focus on the damage mechanism of fusion welded Al alloys due to gas pores or metallurgical defects. This paper performs an investigation on the effect of porosity on the damage evolution of laser hybrid welded 7020‐T651 alloys. The critical pore size comparable with average weld grain was assumed in terms of the population and dimension of micropores. To characterize the coupling effect between gas pores and cracks, an in situ fatigue testing rig was developed to well work at the synchrotron radiation tomography system. Combining synchrotron X‐ray microtomography and fatigue resistance testing, the pore size and location were correlated with the crack initiation and crack growth path but relatively less on the long crack propagation rate. Furthermore, the interaction between the porosity and stress concentration was elucidated by using finite element simulations, which shows that the gas pore appears to be a preferred cracking site especially near the surface.

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Study on the pore/scratch-strength response of ZrB2–SiC ceramic via laser processing

Wang

Yin

et al. 2022

J. Korean Ceram. Soc.

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Image-based numerical simulation of the local cyclic deformation behavior around cast pore in steel

Cited by 4 publications

References 28 publications

Strain accumulation and fatigue crack initiation at pores and carbides in a SX superalloy at room temperature

Strain accumulation and fatigue crack initiation at pores and carbides in a SX superalloy at room temperature

Fatigue behaviors of laser hybrid welded AA7020 due to defects via synchrotron X‐ray microtomography

Study on the pore/scratch-strength response of ZrB2–SiC ceramic via laser processing

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