Effect of standard heat treatment on the microstructure and mechanical properties of hot isostatically pressed superalloy inconel 718

“…The effect of platelet or needle-like incoherent Ni 3 Nb-d phase on the mechanical properties has not been consistently reported in the literature. 1,15,16 In general, the Ni 3 Nb-d phase is considered to have poor bonding characteristics with the c-matrix, leading to the loss of the strength and creep life for IN718. 1,15 However, it was also reported that the precipitation of the Ni 3 Nb-d phase along the c grain boundaries can block grain boundary sliding, refine the grain size, strengthen the grain boundary and thus enhance the tensile strength.…”

Section: Introductionmentioning

confidence: 99%

Tensile properties of laser additive manufactured Inconel 718 using filler wire

et al. 2014

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/npsi/ctrl?action=rtdoc&an=21275548&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=21275548&lang=fr READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions?Contact the NRC Publications Archive team at PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10. 1557/jmr.2014.199 Journal of Materials Research, 29, 17, pp. 2006Research, 29, 17, pp. -2020Research, 29, 17, pp. , 2014 Tensile properties of laser additive manufactured Inconel 718 using filler wire A 5 kW continuous wave fiber laser welding system was used to deposit INCONEL Ò alloy 718 (IN718) on service-exposed IN718 parent metal (PM) substrates using filler wire addition. The microstructure of the deposits was characterized in the fully heat treated condition. The service-exposed IN718 PM and the direct laser deposited (DLD) specimens were then evaluated through room temperature tensile testing. The yield and tensile strengths were well above the minimum values, as defined in the aerospace specifications AMS 5596K and 5663M. However, the ductility at room temperature of the DLD and DLD-PM samples was slightly lower than that specified in AMS 5596K and 5663M. The tensile fracture surfaces of the service-exposed IN718 PM, DLD, and DLD-PM specimens were analyzed using scanning electron microscopy (SEM), and the tensile failure mechanisms are discussed in detail, particularly for the important roles of the secondary particles (MC carbides) and intermetallics (platelet Ni 3 Nb-d and Laves phases).

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“…The y" and y' co-strengthened Ni-Fe based alloy Inconel 718 is widely used in aerospace, nuclear and petrochemical industries owing to its superior mechanical properties, excellent weld ability and relatively low cost [1][2][3]. Among these applications, the cast and wrought (C&W) version is frequently used in disks and shafts [4], while the cast version is always applied in turbine frames, cases and other structures with large size and complex geometry [2,5].…”

Section: Introductionmentioning

confidence: 99%

“…Several investigations were conducted to develop HIPed PM Inconel 718 in the past decade [3,10,11]. The most troublesome problem that metallurgists encounter during process development is the preferential precipitation of high-density carbide particles at the PPBs [3,12].…”

Section: Introductionmentioning

confidence: 99%

“…The most troublesome problem that metallurgists encounter during process development is the preferential precipitation of high-density carbide particles at the PPBs [3,12]. PPBs that are decorated with high-density carbide particles are detrimental to the HIPed PM alloys, not only to the ductility, but also to the low cycle fatigue properties.…”

Section: Introductionmentioning

confidence: 99%

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Development of Prior Particle Boundary Free Hot-Isostatic-Pressing Process for Inconel 718 Powder

Chang¹,

Yang²,

Sun³

et al. 2014

8th International Symposium on Superalloy 718 and Derivatives (2014)

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Hot isostatic pressed (HIPed) powder metallurgy (PM) Inconel 718 has the potential to be applied in turbine engines. However, the precipitation of high-density carbide particles along the prior particle boundaries (PPBs) leads to its poor ductility and is the main obstacle to be overcome if further and wider applications are pursued. In the past few years, we conducted research aimed at solving this problem, and a HIPing method that could eliminate the PPBs was developed. This paper summarizes the results in three parts: the first is on the influence of HIPing temperature on microstructure and tensile fracture modes of the HIPed alloy; several temperatures ranging from below the Laves incipient temperature to super-solidus were selected. In the second part, typical heat treatments for Inconel 718 were employed for mechanical property optimization of the HIPed alloy. It is found that HIPing at super-solidus temperatures could completely eliminate the PPBs, but the grain size is large and detrimental Laves phase also present. In the third part, a new HIPing process was developed, which consists of a short time holding above the solidus and a long time annealing below the incipient temperature of the Laves phase. This process could produce alloy free of PPBs and Laves phase. After heat treatment, the mechanical properties of the alloy are excellent.

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Effect of standard heat treatment on the microstructure and mechanical properties of hot isostatically pressed superalloy inconel 718

Cited by 287 publications

References 8 publications

Investigation of the Mechanical Properties and Microstructure of Nickel Superalloys Processed in Shear Forming / Identyfikacja Właściwości Mechanicznych Oraz Mikrostruktury Superstopów Niklu Przetwarzanych W Procesie Kształtowania Obrotowego

Investigation of the Mechanical Properties and Microstructure of Nickel Superalloys Processed in Shear Forming / Identyfikacja Właściwości Mechanicznych Oraz Mikrostruktury Superstopów Niklu Przetwarzanych W Procesie Kształtowania Obrotowego

Tensile properties of laser additive manufactured Inconel 718 using filler wire

Development of Prior Particle Boundary Free Hot-Isostatic-Pressing Process for Inconel 718 Powder

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