Mapping of residual stresses in as-built Inconel 718 fabricated by laser powder bed fusion: A neutron diffraction study of build orientation influence on residual stresses

Pant, Prabhat; Proper, Sebastian; Luzin, Vladimir; Sjöström, Sören; Simonsson, Kjell; Moverare, Johan; Hosseini, Seyed; Pacheco, Victor; Peng, Ru Lin

doi:10.1016/j.addma.2020.101501

Cited by 24 publications

(34 citation statements)

References 26 publications

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“…The dimension of the L-shape sample is 55 mm × 10 mm × 20 mm with a hole of 5 mm in diameter in one of the side bars. Details regarding printing parameters can be found in [30]. For each build orientation, the part geometry was first sliced into combined layers and then, each layer was assigned a printing time and cooling time.…”

Section: Application Of the Model To L-shaped Samplesmentioning

confidence: 99%

Section: Comparison Of Predicted Rs With Experimental Analysismentioning

confidence: 99%

“…The measurements were made on samples removed from the base plate. Details of the neutron diffraction experiments can be found in [30], in which a comprehensive study of residual stresses in L-shaped In718 by neutron diffraction measurement was presented. In order to have a more representative comparison of the simulation-based results with the experimental data, simulated stresses were extracted at element integration points corresponding to the points measured in the experiment.…”

Section: Comparison Of Predicted Rs With Experimental Analysismentioning

confidence: 99%

“…For the implementation of the model, the commercial software ABAQUS (V6.12, Dassault Systèmes, Johnston, RI, USA) [29] has been used. Further, the model has been applied to study variation in RS magnitude and distribution with regard to the build orientation for L-shaped samples made of Inconel718 (In718) and validated experimentally using neutron diffraction measurements from our previous study [30], where detailed investigation on three differently built orientations with regard to RS was presented. In the following sections, first, the general outline of the model is presented and then, the application of the model for L-shaped samples made from In718 is discussed for different build orientations.…”

Section: Introductionmentioning

confidence: 99%

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A Simplified Layer-by-Layer Model for Prediction of Residual Stress Distribution in Additively Manufactured Parts

Pant

Sjöström

Simonsson

et al. 2021

Metals

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With the improvement in technology, additive manufacturing using metal powder has been a go-to method to produce complex-shaped components. With complex shapes being printed, the residual stresses (RS) developed during the printing process are much more difficult to control and manage, which is one of the issues seen in the field of AM. A simplified finite element-based, layer-by-layer activation approach for the prediction of residual stress is presented and applied to L-shaped samples built in two different orientations. The model was validated with residual stress distributions measured using neutron diffraction. It has been demonstrated that this simplified model can predict the trend of the residual stress distribution well inside the parts and give insight into residual stress evolution during printing with time for any area of interest. Although the stress levels predicted are higher than the measured ones, the impact of build direction on the development of RS during the building process and the final RS distributions after removing the base plate could be exploited using the model. This is important for finalizing the print orientation for a complex geometry, as the stress distribution will be different for different print orientations. This simplified tool which does not need high computational power and time can also be useful in component design to reduce the residual stresses.

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Section: Application Of the Model To L-shaped Samplesmentioning

confidence: 99%

Section: Comparison Of Predicted Rs With Experimental Analysismentioning

confidence: 99%

Section: Comparison Of Predicted Rs With Experimental Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Simplified Layer-by-Layer Model for Prediction of Residual Stress Distribution in Additively Manufactured Parts

Pant

Sjöström

Simonsson

et al. 2021

Metals

Self Cite

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“…While these rules for the setup of the geometry can be represented relatively well (e.g. "smallest possible projected area", "supports from an inclination of the surface of >45°" or "no large horizontal surfaces if possible") [1], the relationship between the alignment of the component and the later component properties is much more complex [2]. Some work was done in the past years to determine optimized build orientations regarding various target values for AM processes [3][4][5][6].…”

Section: State Of the Artmentioning

confidence: 99%

POEAM – A Method for the Part Orientation Evaluation for Additive Manufacturing

Jung

Peetz

Koch

2020

HighTech. Innov. J.

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In the industrial application of additive manufacturing processes, a significant amount of time and resources are dedicated to the orientation and pre-print setup of the geometry. Steps such as the generation of support structures and the process simulation are among the most time-consuming. For the thorough assessment of an orientation of a given geometry, even more criteria, like print time or surface quality, need to be considered. POEAM proposes a method for an efficient assessment of a set of orientations, by means of well formulated criteria and an early elimination of insufficient orientations. The goal is to narrow the search field, so costly preparation steps will only be performed on orientations that promise a superior end result. Furthermore, POEAM is an automated process, which means it can be performed with minimal human interaction, resulting in an optimum regarding cost-efficiency and evaluation time. The method was applied to a representative geometry and has shown results that confirm the above-mentioned advantages.

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Scanning Manufacturing Parameters Determining the Residual Stress State in LPBF IN718 Small Parts

et al. 2021

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The influence of scan strategy on the residual stress (RS) state of an as-built IN718 alloy produced by means of laser powder bed fusion (LPBF) is investigated. Two scan vector rotations (90 -alternation and 67 -rotation), each produced following two different scan vector lengths (long and short), are used to manufacture four rectangular prisms. Neutron diffraction (ND) and laboratory X-ray diffraction (XRD) techniques are used to map the bulk and surface RS state, respectively. The distortion induced upon removal from the baseplate is measured via profilometry. XRD measurements show that the two long scan vector strategies lead to higher RS when compared with the equivalent short scan vector strategies. Also, the 67 -rotation strategies generate lower RS than their 90 -alternation counterparts. Due to the lack of reliable stress-free d 0 references, the ND results are analyzed using von Mises stress. In general, ND results show significant RS spatial non-uniformity. A comparison between ND and distortion results indicates that the RS component parallel to the building direction (Z-axis) has a predominant role in the Z-displacement. The use of a stress balance scheme allows to discuss the d 0 variability along the length of the specimens, as well as examine the absolute RS state.

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Mapping of residual stresses in as-built Inconel 718 fabricated by laser powder bed fusion: A neutron diffraction study of build orientation influence on residual stresses

Cited by 24 publications

References 26 publications

A Simplified Layer-by-Layer Model for Prediction of Residual Stress Distribution in Additively Manufactured Parts

A Simplified Layer-by-Layer Model for Prediction of Residual Stress Distribution in Additively Manufactured Parts

POEAM – A Method for the Part Orientation Evaluation for Additive Manufacturing

Scanning Manufacturing Parameters Determining the Residual Stress State in LPBF IN718 Small Parts

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