3D grain structure modelling of intergranular fracture in forged Haynes 282

Brommesson, Rebecka; Ekh, Magnus; Joseph, Ceena

doi:10.1016/j.engfracmech.2015.12.030

Cited by 8 publications

(5 citation statements)

References 33 publications

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“…The ductility obtained from the simulations are closely related to the preferred crack path in each grain structure, which in turn depends on the size, geometry, orientation of the grains, and the stress distribution within the grain structure. In Figure 11 an example of the crack path in a grain structure with a band orientation of 90 ° is shown, where the straight crack plane gives a brittle behavior [11]. Although there is a scatter in the simulation results, the trend of an improved ductility is evident for simulations with a steeper angle of the band with respect to the tensile axis.…”

Section: Resultsmentioning

confidence: 98%

“…When the carbides at the grain boundaries fail, the crack propagates through the grain boundary and finally the material fails intergranularly. An attempt to model the effect of carbide precipitates in association with the bimodal structure on tensile ductility was made by Brommesson and Joseph [11]. By modeling the microstructure using Voronoi tessellation [12] the bimodal grain size distribution was accounted for.…”

Section: Resultsmentioning

confidence: 99%

“…In this paper the modeling framework introduced in Brommesson and Joseph [11] is used and grain structure models with bands of smaller grains are investigated. The bands are given orientations of 45, 60 and 90° with respect to the tensile axis.…”

Section: Resultsmentioning

confidence: 99%

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Influence of Carbide Distribution on Ductility of Haynes®282® Forgings

et al. 2016

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Haynes ® 282 ® , a relatively new superalloy is used in gas turbines in form of sheets, plates and forgings. Forgings undergo a series of deformation steps at high temperatures to form complex shapes of components. The deformation on forgings, changes the microstructural features and their distribution, and any change in distribution of microstructural features can affect the mechanical properties of the material. The present study is undertaken to investigate the possible causes of anisotropy in mechanical properties of a Haynes ® 282 ® forging through optical and electron microscopy. Microscopic investigations show that ductility is anisotropic and changes from 15% to 21%. The electron backscattered diffraction (EBSD) investigation reveals that the presence of carbide stringers (banding of MC and M6C carbides) is associated with fine grains, thereby giving a bimodal distribution of grain size. Carbide stringers follow the complexity of forgings and are identified as the primary cause for the anisotropic behavior in ductility. Furthermore, micromechanical simulations of carbide stringers in association with a bimodal grain structure was seen to qualitatively correspond to the experimental observation indicating improved ductility with banding along the tensile axis

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

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Influence of Carbide Distribution on Ductility of Haynes®282® Forgings

et al. 2016

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“…[80,228,255,256] Some local mechanical properties are reported for γ 0 precipitates, intragranular carbides, or the δ-phase in superalloys, [257][258][259][260] and are invaluable for precise mechanical modeling. [261][262][263] Quantitative experimental methods [72,157,158,[264][265][266][267] and data analysis approaches [88,89,184,268] exist for GB segregation. However, little to no quantitative information is reported for the local composition of phase boundaries in the proximity of GBs.…”

Section: Processability and Propertiesmentioning

confidence: 99%

Review of Microstructure–Mechanical Property Relationships in Cast and Wrought Ni‐Based Superalloys with Boron, Carbon, and Zirconium Microalloying Additions

et al. 2022

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Cast and wrought Ni‐based superalloys are materials of choice for harsh high‐temperature environments of aircraft engines and gas turbines. Their compositional complexity requires sophisticated thermo‐mechanical processing. A typical microstructure consists of a polycrystalline γ‐matrix, strengthening Ni3(Al,Ti) γ′ precipitates, carbides (MC, M6C, and M23C6), borides (M2B, M3B2, and M5B3), and other inclusions. Microalloying additions of B, C, and Zr commonly improve high‐temperature strength and creep resistance, although excessive additions are detrimental. Grain boundary (GB) segregation may improve cohesion and displace embrittling impurities. Finely dispersed carbides and borides are desired to control grain size via GB pinning. However, excessive decoration of GBs may lead to failure during processing and in‐service. Hence, a systematic review on the roles of B, C, and Zr in cast and wrought Ni‐based superalloys is required. The current state of knowledge on GB segregation and precipitation is reviewed. Experimental and modeling results are compared across various processing steps. The impact of GB precipitation on mechanical properties is most well researched. Co‐precipitation in proximity to GBs interacting with local microstructure evolution and mechanical properties remains less explored. Addressing these gaps in knowledge allows a more complete understanding of processing–microstructure–properties relationships in advanced cast and wrought Ni‐based superalloys.

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“…There are two considerations with respect to the RVE size: One is that the RVE size needs to be large enough so that it includes a sufficient number of grains to represent the global material behavior, the other is that it should also be small enough for computational efficiency. According to the study by Brommesson et al [106], 500 grains were found to be fairly good to model the stress response of Haynes 282 alloy under uniaxial loading as observed in the experiment. Consequently, the number of grains contained in the 3D RVE model is not less than 500, thus, 625 grains are used in the RVE model.…”

Section: Microstructure Modelmentioning

confidence: 70%

Microstructure-Based Computational Fatigue Life Prediction of Structural Materials

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3D grain structure modelling of intergranular fracture in forged Haynes 282

Cited by 8 publications

References 33 publications

Influence of Carbide Distribution on Ductility of Haynes®282® Forgings

Influence of Carbide Distribution on Ductility of Haynes®282® Forgings

Review of Microstructure–Mechanical Property Relationships in Cast and Wrought Ni‐Based Superalloys with Boron, Carbon, and Zirconium Microalloying Additions

Microstructure-Based Computational Fatigue Life Prediction of Structural Materials

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