Impact of heat treatment on mechanical behaviour of Inconel 718 processed with tailored microstructure by selective laser melting

Popovich, Vera; Борисов, Е. В.; Popovich, Anatoly; Sufiiarov, Vadim; Masaylo, Dmitriy; Alzina, L.

doi:10.1016/j.matdes.2017.05.065

Cited by 278 publications

(83 citation statements)

References 25 publications

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“…Actually, the δ‐Ni 3 Nb phase does not form during the additive manufacturing process due to the limited availability of Nb in the matrix, but such phase can form as soon as Laves phases and other Nb‐rich compounds are dissolved upon post heat treatment. Similar mechanisms are proposed also by Popovich et al and Qi et al…”

Section: Resultssupporting

confidence: 87%

Solution Treatment Study of Inconel 718 Produced by SLM Additive Technique in View of the Oxidation Resistance

et al. 2018

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The additive manufacturing concept for the production of complex near net shape metal parts is obtaining increasing attention due to the possibility of producing assembled and/or complex parts allowing optimal design and saving time and cost. The possibility to use the free design of Selective Laser Melting (SLM) techniques for the fabrication of complex 3D components using high performing, although difficult to work, materials such as Ni superalloys is really attractive. The particular process conditions that are established during additive manufacturing in SLM leads to microstructures different with respect to those observed in standard cast or wrought analogous material. Therefore, it is usually necessary to apply a post solution treatment, in order to reduce the segregation of heavier elements (in particular Nb) and dissolve the interdendritic precipitates. In this study, the influence of temperature and time of the solution treatment on the microstructure is investigated in order to find the best results in terms of the final oxidation resistance. Oxidation performances of solutioned Inconel 718 fabricated via SLM are reported and discussed. The growth rate of the superficial oxide at the temperature of 850 C was measured and the longterm stability of this passivating layer was tested until 908 h.

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Section: Resultssupporting

confidence: 87%

Solution Treatment Study of Inconel 718 Produced by SLM Additive Technique in View of the Oxidation Resistance

et al. 2018

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“…However, materials with complex microstructures, e.g. Inconel 718 [23] and maraging steel [24], could be prone to failure from second phase particles, and thereby require tailored postprocessing heat treatments.…”

Section: Introductionmentioning

confidence: 99%

Effect of heat treatment on fatigue crack initiation of laser powder bed fusion stainless steel 316L

et al. 2018

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Abstract. Laser powder bed fusion (L-PBF) is an emerging additive manufacturing technique for building structural components. L-PBF processing defects, such as lack of fusion pores, promote fatigue crack initiation and shorten the fatigue life. With well-controlled processing, critical pores can be avoided such that the microstructure-driven intergranular crack initiation mode becomes operative. In this work, the fatigue crack initiation behaviours of as-built and solution annealed L-PBF stainless steel 316L were studied. Crack initiation of the as-built samples is driven by de-bonding of the dendritic grain boundaries. High temperature annealing results in the formation of thermally-induced defects, possibly via the reheat cracking mechanism and the nucleation of pre-existing gas pores. As heat treating could have led to recrystallization and annihilation of the original grain boundary defects, the thermally-induced defects became the new sites for crack initiation. In addition, heat treatment incurred significant reduction in yield strength, such that the interaction of fatigue and ratcheting strain accumulation dominated the deformation behaviour of the material. The resulting fatigue strength in the finite life regime was reduced by about 13% but the fatigue endurance limit was not affected.

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“…Most of the research in this area was focused on development of equipment and technology for 3D printing and materials were paid much less attention. There are still a lot of unsolved problems concerning cement composites in 3D construction [12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Soil-concrete for use in the 3D printers in the construction of buildings and structures

Iubin

Zakrevskaya

2018

MATEC Web Conf.

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Nowadays, the construction of cement composite using 3D printers is considered one of the most promising methods of automation of building processes. However, the compositions of cement composites have several disadvantages, such as high cost, short workability and etc. It has been suggested that clay soil as an additive will help to solve these problems partially. The aim of the work is development the cement compositions with clay soil, for use in 3D printers to construction. The composite consists of cement paste with clay soil and additives. To study printability of a composite the rheological properties in a fresh state were studied. The study of the rheological properties of composites was carried out using a flow table test for mortar. The key factor for determining the suitability of the composite for printing was accepted the diameter of the cone after shaking. The test results showed the possibility of replacing cement paste with clay soil up to 25% which leads to a reduction in the cost and an increase in printability with a slight decrease in the strength of the obtained material to 7%. Utilizing of soil from the construction site provides maximum economic efficiency of the material application.

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Impact of heat treatment on mechanical behaviour of Inconel 718 processed with tailored microstructure by selective laser melting

Cited by 278 publications

References 25 publications

Solution Treatment Study of Inconel 718 Produced by SLM Additive Technique in View of the Oxidation Resistance

Solution Treatment Study of Inconel 718 Produced by SLM Additive Technique in View of the Oxidation Resistance

Effect of heat treatment on fatigue crack initiation of laser powder bed fusion stainless steel 316L

Soil-concrete for use in the 3D printers in the construction of buildings and structures

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