Bulletin of the Polish Academy of Sciences: Technical Sciences

Robl, J.; Sedlák, Josef; Pokorny, Zdenek; Ňuksa, P.; Barényi, Igor; Majerík, Jozef

doi:10.24425/bpasts.2020.131842

Cited by 2 publications

References 10 publications

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Effect of different strain rates on mechanical behavior and structure of Inconel 718 produced by powder bed fusion

Kolomy,

Benc,

Harant

et al. 2024

Int J Mech Mater Des

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The paper aims to examine the effect of different strain rates on a mechanical behavior and structure of additively manufactured Inconel 718. The material was prepared by the powder bed fusion method, which is commonly employed for high-performance components subjected to both high static and dynamic loading. To analyze the material’s behavior at various strain rates, a conventional hydraulic testing machine and a split hopkinson pressure bar apparatus were utilized. Additionally, the effect of these conditions on mechanical properties and microstructure was investigated. Results of compressive tests revealed a positive strain rate sensitivity of the material. Furthermore, the microhardness exhibited an increase by 33.9% in the horizontal direction after deformation caused by 2·10–2 strain rate and 35.8% in the vertical direction, respectively. Additionally, the average grain size decreased by 43.3%, and the high-angle grain boundaries decreased by 5.4% in the horizontal direction after the excessive plastic deformation at the strain rate of 1.8·103 s-1. Scanning electron microscopy images showed that the as-built structure predominantly consisted of Laves phases in a long strip shape, while the structure after dynamic testing featured a granular shape. Transmission electron microscopy analysis of a sample tested at strain rate of 0.002 s-1 revealed finely developed grains within the structure, many of which contained a dislocation substructure. This study’s novelty and robustness lie in its significant contribution to practical industrial energy applications, in which parts are exposed to dynamic load such as gas turbines.

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Effect of different strain rates on mechanical behavior and structure of Inconel 718 produced by powder bed fusion

Kolomy,

Benc,

Harant

et al. 2024

Int J Mech Mater Des

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Bulletin of the Polish Academy of Sciences: Technical Sciences

Kluczyński

Śnieżek

Grzelak

et al. 2020

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Industries that rely on additive manufacturing of metallic parts, especially biomedical companies, require material science-based knowledge of how process parameters and methods affect the properties of manufactured elements, but such phenomena are incompletely understood. In this study, we investigated the influence of selective laser melting (SLM) process parameters and additional heat treatment on mechanical properties. The research included structural analysis of residual stress, microstructure, and scleronomic hardness in low-depth measurements. Tensile tests with specimen deformation analysis using digital image correlation (DIC) were performed as well. Experiment results showed it was possible to observe the porosity growth mechanism and its influence on the material strength. Specimens manufactured with 20% lower energy density had almost half the elongation, which was directly connected with the porosity growth during energy density reduction. Hot isostatic pressing (HIP) treatment allowed for a significant reduction of porosity and helped achieve properties similar to specimens manufactured using different levels of energy density.

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Bulletin of the Polish Academy of Sciences: Technical Sciences

Cited by 2 publications

References 10 publications

Effect of different strain rates on mechanical behavior and structure of Inconel 718 produced by powder bed fusion

Effect of different strain rates on mechanical behavior and structure of Inconel 718 produced by powder bed fusion

Bulletin of the Polish Academy of Sciences: Technical Sciences

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