Microstructure and Mechanical Properties of Inconel 718 Produced by SLM and Subsequent Heat Treatment

Popovich, Anatoly; Sufiiarov, Vadim; Polozov, Igor; Борисов, Е. В.

doi:10.4028/www.scientific.net/kem.651-653.665

Cited by 71 publications

(30 citation statements)

References 6 publications

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“…As that for titanium alloys, employing SLM or EBM to manufacture Ni-base superalloys would depend on the specific case or application, since each process has its pros and cons. So far, the Ni-base superalloys applied to SLM are mainly the weldable ones, i.e., IN718 [113,[160][161][162][163][164][165][166][167], IN625 [79,80,168,169], Hastelloy X [170][171][172][173][174], Nimonic 263 [110], which have low additions of both Ti and Al and are less susceptible to strain age cracking. Expansion to the less-weldable Ni-base superalloys has also been attempted, such as IN939 [175], IN100 [176], IN738LC [177][178][179][180][181], CM247LC [114,[182][183][184] and Rene 142 [81].…”

Section: Materials Manufactured With Slmmentioning

confidence: 99%

Additively Manufactured Inconel 718 : Microstructures and Mechanical Properties

Deng

2018

Linköping Studies in Science and Technology. Licentiate Thesis

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Linköping 2018Cover image: A fracture surface of EBM IN718 after tensile test at room temperature.During the course of research underlying this thesis, Dunyong Deng was enrolled in Agora Materiae, a multidiciplinary doctoral program at Linköping University, Sweden. Printed by LiU-Tryck 2018 © Dunyong Deng AbstractAdditive manufacturing (AM), also known as 3D printing, has gained significant interest in aerospace, energy, automotive and medical industries due to its capabilities of manufacturing components that are either prohibitively costly or impossible to manufacture by conventional processes. Among the various additive manufacturing processes for metallic components, electron beam melting (EBM) and selective laser melting (SLM) are two of the most widely used powder bed based processes, and have shown great potential for manufacturing high-end critical components, such as turbine blades and customized medical implants. The futures of the EBM and SLM are doubtlessly promising, but to fully realize their potentials there are still many challenges to overcome.Inconel 718 (IN718) is a nickel-base superalloy and has impressive combination of good mechanical properties and low cost. Though IN718 is being mostly used as a turbine disk material now, the initial introduction of IN718 was to overcome the poor weldability of superalloys in 1960s, since sluggish precipitation of strengthening phases γ ′ /γ ′′ enables good resistance to strain-age cracking during welding or post weld heat treatment. Given the similarity between AM and welding processes, IN718 has been widely applied to the metallic AM field to facilitate the understandings of process-microstructure-property relationships.The work presented in this licentiate thesis aims to better understand microstructures and mechanical properties EBM and SLM IN718, which have not been systematically investigated. Microstructures of EBM and SLM IN718 have been characterized with scanning electron microscopy (SEM), transmission electron microscopy (TEM) and correlated with the process conditions. Monotonic mechanical properties (e.g., Vickers microhardness and tensile properties) have also been measured and rationalized with regards to the microstructure evolutions before and after heat treatments.For EBM IN718, the results show the microstructure is not homogeneous but dependant on the location in the components, and the anisotropic mechanical properties are probably attributed to alignment of porosities rather than texture.iii Post heat treatment can slightly increase the mechanical strength compared to the as-manufactured condition but does not alter the anisotropy. SLM IN718 shows significantly different microstructure and mechanical properties to EBM IN718. The as-manufactured SLM IN718 has very fine dendritic microstructure and Laves phases in the interdendrites, and is "work-hardened" by the residual strains and dislocations present in the material. Mechanical properties are different between horizontally and vertically built samples, and heat treatment can m...

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Section: Materials Manufactured With Slmmentioning

confidence: 99%

Additively Manufactured Inconel 718 : Microstructures and Mechanical Properties

Deng

2018

Linköping Studies in Science and Technology. Licentiate Thesis

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“…При получении образцов исполь-зованы режимы, обеспечивающие наибольшую плотность, как было показано в предыдущих на-ших работах [11,22]. Принципиальная схема про-цесса СЛП представлена на рис.…”

Section: методика исследований и оборудованиеunclassified

“…Исследования микроструктуры полученных по технологии СЛП образцов, представленные в работах [2][3][4][5][6][7][8][9][10][11] …”

Section: Introductionunclassified

“…Исследования микроструктуры полученных по технологии СЛП образцов, представленные в работах [2][3][4][5][6][7][8][9][10][11], показали, что при селективном лазерном плавлении зерна ориентированы преи-мущественно параллельно направлению выращи-вания. Направленность кристаллографической тек-стуры вдоль оси выращивания отмечена для мно-гих материалов, например сплавов Inconel 718 [11], Inconel 738LC [3], AlSi10Mg [4], тантала [5], стали 316L [6], CM247LC [7], NiCr [8], NiTi [10] и др.…”

Section: Introductionunclassified

“…Направленность кристаллографической тек-стуры вдоль оси выращивания отмечена для мно-гих материалов, например сплавов Inconel 718 [11], Inconel 738LC [3], AlSi10Mg [4], тантала [5], стали 316L [6], CM247LC [7], NiCr [8], NiTi [10] и др.…”

Section: Introductionunclassified

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Anisotropy of Mechanical Properties of Products Manufactured Using Selective Laser Melting of Powdered Materials

Popovich¹,

Sufiiarov²,

Борисов³

et al. 2016

Izv. VUZ. Poroshk. Met.

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Рассмотрены причины возникновения анизотропии свойств в изделиях, изготавливаемых по технологии селективного лазерного плавления металлических порошковых материалов. Представлены результаты оценки механических свойств образцов из сплавов основе титана Ti-6Al-4V, ВТ6 и жаропрочного никелевого сплава Inconel 718 в различных направ-лениях. Исследована микроструктура компактных образцов, полученных селективным лазерным плавлением. Приведе-на зависимость их механических свойств от ориентации заготовок относительно рабочей платформы установки. Анализ микрошлифов из сплава Ti-6Al-4V показал, что у образца прямоугольной формы направление зеренной структуры со-ответствует направлению выращивания, тогда как при изготовлении тонких элементов сетчатой конструкции за счет их меньшего сечения протекают иные тепловые процессы, что сказывается на условиях кристаллизации и формирующейся микроструктуре: в зависимости от угла наклона элемента сетчатой конструкции изменяются направление и форма зерен. Anisotropy of mechanical properties of products manufactured using selective laser melting of powdered materialsThe paper examines factors leading to anisotropy of properties in products manufactured using lasercusing, a technology consisting in selective laser melting of metal powdered materials. The results obtained when evaluating mechanical properties of specimens made of titanium alloys Ti-6Al-4V, VT6 and heat-resistant nickel alloy Inconel 718 in different directions are presented. The study covers the microstructure of compact specimens obtained using selective laser melting, and describes dependence of their mechanical properties on workpiece orientation with relation to the unit working platform. The study of Ti-6Al-4V microsections showed that the direction of the rectangular specimen grain structure matched the growth direction, whereas thin elements with a lattice structure were made with other thermal processes due to their smaller cross section. This affected crystallization conditions and microstructure being formed: grain directions and shapes changed depending on the lattice structure element inclination.Keywords: additive manufacturing, selective laser melting, powder metallurgy, titanium alloys, nickel alloys, layer-by-layer manufacturing, anisotropy, mechanical properties. ВведениеТехнология селективного лазерного плавления (СЛП) уже сейчас активно применяется для из-готовления металлических изделий, что связано с возможностью производства заготовок, макси-мально близких по своей конфигурации к конеч-ному изделию, напрямую из компьютерной мо-дели, без использования оснастки. Это позволяет экономить материалы и затраты на последующую обработку, а также обеспечивает свободу выбо-ра формы изделий, которая может существенно повысить эксплуатационные характеристики де-талей [1]. Последнее особенно актуально в таких областях, как авиация и медицина. В авиации, где титановые и никелевые сплавы получили широ-кое распространение, предъявляются особенные требования к массе изделий. Применение адди-тивных технологий позволя...

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Pitting corrosion resistance of additive manufactured alloy 718 in alkaline brines at elevated temperatures

Gisinger

Kube

Klapper

2022

Materials & Corrosion

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The feasibility of additive manufacturing (AM) to produce industrial components, also for the oil and gas industry, has been demonstrated in the past. Therefore, current research efforts focus on demonstrating the reliability of AM materials subjected to demanding service conditions. In this regard, special attention has been paid to its corrosion resistance in harsh environments as one of the most critical properties in these applications. The beneficial combination of high strength, excellent thermal stability, and outstanding corrosion resistance makes alloy 718 (UNS N07718) the most used wrought and AM nickel alloy in the oil and gas industry. Wrought 718 has an extensive record of field performance in demanding oil and gas applications including directional drilling tools that undergo extreme mechanical loads in corrosive drilling fluids. On the other hand, limited data regarding the corrosion behavior of AM718 in typical drilling environments has been collected so far. In this research work, the pitting susceptibility of selective laser melted alloy 718 in simulated drilling environments has been studied.Open circuit potential measurements as well as cyclic potentiodynamic and potentiostatic polarization tests were used to characterize the pitting corrosion resistance of AM718 in alkaline brines at elevated temperatures. In addition, microstructural particularities in alloy 718 were investigated to explain the observed differences in the electrochemical behaviors.

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Microstructure and Mechanical Properties of Inconel 718 Produced by SLM and Subsequent Heat Treatment

Cited by 71 publications

References 6 publications

Additively Manufactured Inconel 718 : Microstructures and Mechanical Properties

Additively Manufactured Inconel 718 : Microstructures and Mechanical Properties

Anisotropy of Mechanical Properties of Products Manufactured Using Selective Laser Melting of Powdered Materials

Pitting corrosion resistance of additive manufactured alloy 718 in alkaline brines at elevated temperatures

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