Structural integrity and mechanical properties of the functionally graded material based on 316L/IN718 processed by DED technology

Melzer, Daniel; Džugan, Ján; Koukolíková, Martina; Rzepa, Sylwia; Vavřík, Jaroslav

doi:10.1016/j.msea.2021.141038

Cited by 62 publications

(16 citation statements)

References 17 publications

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“…Materials 2022, 15 The fracture surface derived in this study was compared with the one published b Paredes et al [47], where the mechanical tests of two conventionally produced austeniti steels 316L from different suppliers A and B were performed. For the fracture surface they used the MMC model and all the parameters were published, namely the equivalen plastic strain to fracture, stress triaxiality and normalized Lode angle.…”

Section: Force-displacement Curve Equivalent Plastic Strain Metallogr...mentioning

confidence: 99%

“…The MMC model in the modified Haigh-Westergaard space and for plane stress condition for honeycom structure (current study, green curve) and two materials from supplier A (Paredes, blu curve) and supplier B (Paredes, red curve) are depicted in Figure 18. The material wa assessed as isotropic, and mechanical properties were determined in the rolling direction (a) (b) The well-documented steps for fracture locus construction as published by Bai, Wierzbicki [45], Mohr [16,46], and Lian, Munstermann [47] were followed. The calibrated material constants of Swift and MMC models are shown in Table 5.…”

Section: Force-displacement Curve Equivalent Plastic Strain Metallogr...mentioning

confidence: 99%

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Prediction of Behaviour of Thin-Walled DED-Processed Structure: Experimental-Numerical Approach

et al. 2022

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Additive manufacturing (AM) becomes a more and more standard process in different fields of industry. There is still only limited knowledge of the relationship between measured material data and the overall behaviour of directed energy deposition (DED)-processed complex structures. The understanding of the structural performance, including flow curves and local damage properties of additively manufactured parts by DED, becomes increasingly important. DED can be used for creating functional surfaces, component repairing using multiple powder feeders, and creating a heterogeneous structure with defined chemical composition. For thin parts that are used with the as-deposited surface, this evaluation is even highly crucial. The main goal of the study was to predict the behaviour of thin-walled structures manufactured by the DED process under static loading by finite element analysis (FEA). Moreover, in this study, the mechanical performance of partly machined and fully machined miniaturized samples produced from the structure was compared. The structure studied in this research resembles a honeycomb shape made of austenitic stainless steel AISI 316L, which is characterized by high strength and ductility. The uncoupled damage models based on a hybrid experimental-numerical approach were used. The microstructure and hardness were examined to comprehend the structural behaviour.

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Section: Force-displacement Curve Equivalent Plastic Strain Metallogr...mentioning

confidence: 99%

Section: Force-displacement Curve Equivalent Plastic Strain Metallogr...mentioning

confidence: 99%

Prediction of Behaviour of Thin-Walled DED-Processed Structure: Experimental-Numerical Approach

et al. 2022

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“…However, implementation of AM for applications in strength/fracture critical components requires reliable performance [1]. This can be facilitated by a better understanding of the resulting materials' properties by enabling the appropriate design of AM-produced components [2][3][4]. The significantly different process windows for their production in comparison to well-known classical processes (e.g., casting, forging, rolling, etc.)…”

Section: Introductionmentioning

confidence: 99%

The Use of Miniature Specimens to Determine Local Properties and Fracture Behavior of LPBF-Processed Inconel 718 in as-Deposited and Post-Treated States

et al. 2022

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This paper summarizes the assessment of directional anisotropy in local mechanical properties for Laser Powder Bed Fusion (LPBF) IN-718 bulk samples via the use of miniature samples excised from the bulk for both as-deposited and post-treated states. The quasi-static tensile properties at room temperature are investigated at several different locations along the build direction and at different orientations for both considered states. A comparison between the excised miniature tensile specimens and standard-sized sample results have also been conducted and exhibit very good agreement. Significant anisotropy is present in mechanical properties at different build heights for the as-deposited state, while the post-treated material exhibited more homogenous properties, both along the height and for different sampling orientations. However, significant reductions (e.g., >30%) in the strength (Yield, UTS) along with a significant increase in the reduction in area at fracture is found for post-processed materials. Metallography and fractography analyses were conducted in order to begin to determine the source(s) of this anisotropy for the as-deposited state.

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“…Allied with considering the microstructural effects of additively manufactured parts on their mechanical properties, Bhujangrao et al [24] studied the effect of high-temperature on the microstructure for Inconel 718. Moreover, Melzer et al [25] presented a detailed investigation on the mechanical and microstructural characteristics of a functionally graded material (FGM) of SS 316L and Inconel 718 manufactured by DED. They studied the effect of the material interface on the mechanical response of the produced parts experimentally.…”

Section: Introductionmentioning

confidence: 99%

Damage Evolution Simulations via a Coupled Crystal Plasticity and Cohesive Zone Model for Additively Manufactured Austenitic SS 316L DED Components

Darabi

Azinpour

Ferreira

et al. 2022

Metals

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This study presents a microstructural model applicable to additively manufactured (AM) austenitic SS 316L components fabricated via a direct energy deposition (DED) process. The model is primarily intended to give an understanding of the effect of microscale and mesoscale features, such as grains and melt pool sizes, on the mechanical properties of manufactured components. Based on experimental observations, initial assumptions for the numerical model regarding grain size and melt pool dimensions were considered. Experimental observations based on miniature-sized 316L stainless steel DED-fabricated samples were carried out to shed light on the deformation mechanism of FCC materials at the grain scale. Furthermore, the dependency of latent strain hardening parameters based on the Bassani–Wu hardening model for a single crystal scale is investigated, where the Voronoi tessellation method and probability theory are utilized for the definition of the grain distribution. A hierarchical polycrystalline modeling methodology based on a representative volume element (RVE) with the realistic impact of grain boundaries was adopted for fracture assessment of the AM parts. To qualify the validity of process–structure–property relationships, cohesive zone damage surfaces were used between melt pool boundaries as the predefined initial cracks and the performance of the model is validated based on the experimental observations.

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Structural integrity and mechanical properties of the functionally graded material based on 316L/IN718 processed by DED technology

Cited by 62 publications

References 17 publications

Prediction of Behaviour of Thin-Walled DED-Processed Structure: Experimental-Numerical Approach

Prediction of Behaviour of Thin-Walled DED-Processed Structure: Experimental-Numerical Approach

The Use of Miniature Specimens to Determine Local Properties and Fracture Behavior of LPBF-Processed Inconel 718 in as-Deposited and Post-Treated States

Damage Evolution Simulations via a Coupled Crystal Plasticity and Cohesive Zone Model for Additively Manufactured Austenitic SS 316L DED Components

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