Strong morphological and crystallographic texture and resulting yield strength anisotropy in selective laser melted tantalum

Thijs, Lore; Montero-Sistiaga, Maria L.; Wauthlé, Ruben; Xie, Qingge; Kruth, Jean‐Pierre; Humbeeck, Jan Van

doi:10.1016/j.actamat.2013.04.036

Cited by 545 publications

(231 citation statements)

References 17 publications

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“… Differently orientating the scan vectors for every layer leads to a reduction of residual stress [8], [44].  Subdivision of the layer into smaller parts results in lower maximum stress values [4].…”

Section: Scan Strategy Developmentmentioning

confidence: 99%

The Effects of Selective Laser Melting Scan Strategies on Deviation of Hybrid Parts

Hagedorn-Hansen¹,

Bezuidenhout²,

Dimitrov³

et al. 2017

SAJIE

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The use of additive manufacturing to produce intricate part geometries in the aerospace, medical, and tool-and-die industries is increasingly incorporated in manufacturing process chains. However, the high costs, long production times, and material integrity issues associated with additive manufacturing technologies such as selective laser melting make the process suitable only for certain applications. In order to reduce selective laser melting production costs for selected parts, a combination of selective laser melting and milling can be used. Metal parts produced with this method are referred to as hybrid parts. A challenge in producing hybrid parts is to reduce the geometrical deviation due to processinduced warping. This paper discusses the effects of various laser scan strategies on the deviation of hybrid parts. A newly developed scan strategy is experimentally compared with its commercial counterpart with regard to as-built part warping and porosity. The novel strategy resulted in a significant reduction in warping and porosity. OPSOMMINGDie benutting van toevoegingsvervaardiging vir die produksie van komplekse onderdeel geometrieë in die lugvaart, mediese, en werktuig industrieë word toenemend geïnkorporeer in vervaardigingsproseskettings. Gepaardgaande hoë kostes, lang produksietye, en materiaal integriteitstekortkominge met toevoegingsvervaardiging tegnologieë soos selektiewe laser smelting veroorsaak dat die proses slegs uitvoerbaar is vir sekere toepassings. Ten einde selektiewe laser smelting produksiekoste te verminder vir geselekteerde onderdele, kan 'n kombinasie van selektiewe laser smelting en freesmasjinering geïmplementeer word. Metaal onderdele wat met so kombinasie geproduseer word, word na verwys as hibried onderdele. 'n Uitdaging in die vervaardiging van hibried onderdele is om geometriese afwyking deur skeeftrekking wat deur die proses veroorsaak word, te verminder. Hierdie artikel bespreek die effekte van verskeie laser skandeer strategieë op die afwyking van hibried onderdele. 'n Nuut ontwikkelde skandeer strategie is eksperimenteel vergelyk met 'n kommersiële eweknie met betrekking tot skeeftrekking en porositeit. Die skeeftrekking en porositeit van die nuut uitgevonde strategie is beduidend laer.

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Section: Scan Strategy Developmentmentioning

confidence: 99%

The Effects of Selective Laser Melting Scan Strategies on Deviation of Hybrid Parts

Hagedorn-Hansen¹,

Bezuidenhout²,

Dimitrov³

et al. 2017

SAJIE

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“…These values are very close to nickel-based superalloys used for advanced turbine engines with YS often in the range of 900-1300 MPa and UTS of 1200-1600 MPa [18]. However, it should be noted that SLM-processed materials are characterized by a strong anisotropy and high residual stresses after fabrication which affect their mechanical behavior [9,19,20]. Consequently, further studies of high-temperature mechanical properties of Ti-Re alloys, taking into account the microstructure anisotropy and internal stresses, are needed for their comparison to Ni-based superalloys.…”

Section: Introductionmentioning

confidence: 94%

“…Another important advantage of the SLM process is the ability to produce elements made of materials with high melting points, e.g., tantalum [9], molybdenum [10], rhenium [11] and tungsten carbide [12], and to combine metallic powders of those materials with metals of significantly different physical properties. As the attempts of modifying mechanical properties of Ti and its alloys in the SLM process by additions of refractory metals such as Mo [13] and Re [14] appeared successful, this work considers further investigations of selective laser melted Ti-Re alloys.…”

Section: Introductionmentioning

confidence: 99%

Hot Corrosion of Ti–Re Alloys Fabricated by Selective Laser Melting

et al. 2017

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Selective laser melting (SLM) is an additive manufacturing process that enables novel alloy production by combining metals with significantly different physical properties. In this paper, the hot corrosion behavior of Ti-Re alloys fabricated by SLM was studied in a mixture of Na 2 SO 4 and NaCl salts at 600°C. The morphology and composition of the corrosion products were characterized by scanning electron microscopy with energy-dispersive X-ray spectroscopy and X-ray diffraction to understand the degradation mechanisms. It has been shown that the hot corrosion resistance of Ti-Re alloys was influenced by the chemical inhomogeneity of the oxide scale resulting from the presence of rhenium particles undissolved during the SLM process.

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“…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

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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Strong morphological and crystallographic texture and resulting yield strength anisotropy in selective laser melted tantalum

Cited by 545 publications

References 17 publications

The Effects of Selective Laser Melting Scan Strategies on Deviation of Hybrid Parts

The Effects of Selective Laser Melting Scan Strategies on Deviation of Hybrid Parts

Hot Corrosion of Ti–Re Alloys Fabricated by Selective Laser Melting

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

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