Investigation of the IN-738 superalloy microstructure and mechanical properties for the manufacturing of gas turbine engine nozzle guide vane by selective laser melting

Сотов, А В; Агаповичев, А. В.; Смелов, В. Г.; Кокарева, В. В.; Dmitrieva, M. O.; Melnikov, A. A.; Голанов, С. П.; Anurov, Yu. M.

doi:10.1007/s00170-020-05197-x

Cited by 54 publications

(14 citation statements)

References 16 publications

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“…The as-printed XY-orientated samples exhibit higher strength and lower ductility than their Z-oriented counterparts, which has been observed in other additively manufactured superalloys with columnar microstructures 65 . This behavior is often reversed when a high density of cracks is present in the as-printed microstructure, resulting in reduced yield strengths as the print orientation changes and preexisting cracks become oriented perpendicular to the loading direction 66 . The SX Ni-base superalloy CMSX-4 has recently been printed in cylindrical bar form by EBM, producing a SX core with equiaxed grains at the surface 67 .…”

Section: Discussionmentioning

confidence: 99%

A defect-resistant Co–Ni superalloy for 3D printing

et al. 2020

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Additive manufacturing promises a major transformation of the production of high economic value metallic materials, enabling innovative, geometrically complex designs with minimal material waste. The overarching challenge is to design alloys that are compatible with the unique additive processing conditions while maintaining material properties sufficient for the challenging environments encountered in energy, space, and nuclear applications. Here we describe a class of high strength, defect-resistant 3D printable superalloys containing approximately equal parts of Co and Ni along with Al, Cr, Ta and W that possess strengths in excess of 1.1 GPa in as-printed and post-processed forms and tensile ductilities of greater than 13% at room temperature. These alloys are amenable to crack-free 3D printing via electron beam melting (EBM) with preheat as well as selective laser melting (SLM) with limited preheat. Alloy design principles are described along with the structure and properties of EBM and SLM CoNi-base materials.

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Section: Discussionmentioning

confidence: 99%

A defect-resistant Co–Ni superalloy for 3D printing

et al. 2020

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“…The advantage of SLM is that it can produce structures with complex shapes, such as thin walls or small holes, with the same mechanical properties as those obtained via conventional manufacturing methods. SLM technology not only can create complex shapes but can also produce special shapes that cannot be manufactured by conventional casting methods [10].…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Thermal Conductivity of Nickel-Based Superalloy CM247LC Fabricated via Selective Laser Melting

et al. 2021

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Efforts to enhance thermal efficiency of turbines by increasing the turbine inlet temperature have been further accelerated by the introduction of 3D printing to turbine components as complex cooling geometry can be implemented using this technique. However, as opposed to the properties of materials fabricated by conventional methods, the properties of materials manufactured by 3D printing are not isotropic. In this study, we analyzed the anisotropic thermal conductivity of nickel-based superalloy CM247LC manufactured by selective laser melting (SLM). We found that as the density decreases, so does the thermal conductivity. In addition, the anisotropy in thermal conductivity is more pronounced at lower densities. It was confirmed that the samples manufactured with low energy density have the same electron thermal conductivity with respect to the orientation, but the lattice thermal conductivity was about 16.5% higher in the in-plane direction than in the cross-plane direction. This difference in anisotropic lattice thermal conductivity is proportional to the difference in square root of elastic modulus. We found that ellipsoidal pores contributed to a direction-dependent elastic modulus, resulting in anisotropy in thermal conductivity. The results of this study should be beneficial not only for designing next-generation gas turbines, but also for any system produced by 3D printing.

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“…Для предотвращения окисления и возгорания частиц порошка во время процесса формирования монослоев рабочая камера заполняется инертным газом, при этом содержание кислорода не превышает 0,2%. Основные параметры изготовления тестовых образцов секций соплового аппарата турбины методом селективного лазерного сплавления из металлического порошка жаропрочного сплава Inconel 738 на установке SLM 280HL: мощность 325 Вт, скорость сканирования 677 мм/с [5]. Изготовленные секций соплового аппарата турбины ГТД представлены на рис.…”

Section: материалы и методыunclassified

The Study of the Accuracy and Stability of Gte Nozzle Guide Vanes Assembly Units Manufacturing by the Method of Selective Laser Melting Using Quality Control Charts

Alekseev¹,

Khaimovich²,

Smelov³

et al. 2020

Izvestiya of SSC RAS

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This paper presents the results of a study of the accuracy and stability of GTE nozzle guide vanes assembly units manufacturing by the method of selective laser melting using quality control charts. The GTE nozzle guide vanes assembly units were made from material Inconel 738 by selective laser melting on an SLM 280HL equipment. The control of the geometric characteristics of the nozzle guide vanes assembly units that manufactured using additive technology was carried out on a coordinate measuring machine. We statistical analyzed the technological process using control charts for quantitative data and an assessment of the SLM process capabilities to meet the specified requirements. The geometry accuracy of guide nozzle blades airfoil was selected as a part quality parameter, which significantly affects the operational part characteristics. As a result of the conducted statistical analysis, it was found that the SLM process is in a state of statistical controllability with respect to internal variability, is suitable for meeting the given requirements and has a sufficient margin of capabilities necessary for effective process control. Checking the quality assurance terms for compliance with the requirements indicates that there may be geometers parameters values that lie outside the tolerance limit and, as a result, the part may be defective.

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Investigation of the IN-738 superalloy microstructure and mechanical properties for the manufacturing of gas turbine engine nozzle guide vane by selective laser melting

Cited by 54 publications

References 16 publications

A defect-resistant Co–Ni superalloy for 3D printing

A defect-resistant Co–Ni superalloy for 3D printing

Anisotropic Thermal Conductivity of Nickel-Based Superalloy CM247LC Fabricated via Selective Laser Melting

The Study of the Accuracy and Stability of Gte Nozzle Guide Vanes Assembly Units Manufacturing by the Method of Selective Laser Melting Using Quality Control Charts

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