Influence of modified processing on structure and properties of hot isostatically pressed superalloy Inconel 718

Rao, G. Appa; Srinivas, M.; Sarma, D. S.

doi:10.1016/j.msea.2005.11.031

Cited by 92 publications

(34 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The standard heat treatment per AMS5662 is not suitable for P/M IN718. Instead, a solution treatment at 1270 • C and a HIP at 1100 • C/130 MPa/3 h were suggested prior to the standard heat treatment per AMS5662 [43], in order to break the PPB networks.…”

Section: Powder Metallurgy (P/m) In718mentioning

confidence: 99%

Additively Manufactured Inconel 718 : Microstructures and Mechanical Properties

Deng

2018

Linköping Studies in Science and Technology. Licentiate Thesis

View full text Add to dashboard Cite

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...

show abstract

Section: Powder Metallurgy (P/m) In718mentioning

confidence: 99%

Additively Manufactured Inconel 718 : Microstructures and Mechanical Properties

Deng

2018

Linköping Studies in Science and Technology. Licentiate Thesis

View full text Add to dashboard Cite

show abstract

“…Increasing the soaking time of HIP will enhance the effects of NbC and precipitation-strength 00 phases. [22][23][24] The maximum tensile strength, 0.2% yield strength and elongation appeared for 4 hours soaking time of HIP treated 718 alloy. It can increase the tensile strength by 31% at 298 K, 27% at 813 K, and 24% at 923 K. Also, the elongation of alloy increases about 100% at 298 K and 130% at 813 K and 60% at 923 K after tension tests.…”

Section: )mentioning

confidence: 97%

“…Figure 11(a) shows the TEM micrographs of 1453 K, 00 precipitation. 5,22,23) The phase gradually dissolves as the temperature and pressure increase of HIP treatment. The low volume fraction of phase appears in the optimal of HIP treatment.…”

Section: )mentioning

confidence: 99%

Improvement in the Microstructure and Tensile Properties of Inconel 718 Superalloy by HIP Treatment

et al. 2006

View full text Add to dashboard Cite

Hot Isostatic Pressing (HIP) is a process that uniquely combines higher pressure and temperature to produce materials and parts with substantially better properties than those by other methods. The aim of this paper is to discuss the methods and to find a suitable process of HIP for Inconel 718 superalloy. In this study, the HIP process parameters considered were; temperatures: 1423, 1448, 1453 and 1478 K, pressures: 100, 150, 175 and 200 MPa, and soaking times of 2, 3 and 4 hours. The Inconel 718 superalloy is used throughout this study. To evaluate the effects of microstructure and tensile properties of 718 alloy by HIP process, tensile test at two different strain rates at room and high temperature were evaluated. The microstructure, TEM and XRD inspections were performed.The experiment results show that at 1453 K, 175 MPa, 4 hours of HIP treatment for Inconel 718 superalloy was optimal. It can improve the microstructure and tensile properties of 718 castings. Through the optimal HIP treatment, the grain sizes are uniform and the segregated structure is improved. At fast strain rate (0.001 s À1 ), it increased the tensile strength by 31% at 298 K, 27% at 813 K, and 24% at 923 K. The 0.2% yield strength increased 40% at 298 K, 31% at 813 K, and 28% at 923 K. Meanwhile the elongation increased 100% at 298 K, 130% at 813 K, and 60% at 923 K after tension tests. When the strain rate was very slowly (0.0001 s À1 ), it also increased the tensile strength by 24% at 298 K and 20% at 813 K. The 0.2% yield strength increased 29% at 298 K and 27% at 813 K. The elongation increased 54% at 298 K and 282% at 813 K.

show abstract

“…It is recognized that different AM powder rated in Figures 9 (c-d), appears to also differentiate e LPD from other AM processes. The directional solidification is characteristic of a structures with any preferred orientation, typically lead to anisotropic echanical properties [4][5][6], which may be beneficial for high temperature creep strength , be A directional grain structure, illust th planar solidification front associated with high G/R (temperature Gradient/solidification Rate) values in line with conventional solidification theory. The primary process variables are energy and mass input, which are controlled by laser (or EB) power, deposition speed and powder (or wire) feed [4].…”

Section: F Uts 1200f Ys 1200f Elmentioning

confidence: 99%

Additively Manufactured INCONEL® Alloy 718

Benn¹,

Salva²

2010

7th International Symposium on Superalloy 718 and Derivatives (2010)

View full text Add to dashboard Cite

Significant contributions have been made in recent years to the development of Additive Manufacturing (AM) technology. Improvements in laser and electron beam-based AM equipment using powder injection, powder bed or wire feed systems have benefited from advances in software programs to convert complex CAD models into Digitally Manufactured parts. Wider acceptance of AM technology in, for example the aerospace industry, is driven by meeting stringent quality, schedule and cost requirements. These factors, in addition to the specific property requirements and level of part-family complexity, strongly influence the selection of the appropriate Additive Manufacturing process. This presentation will briefly review some of the factors and criteria that must be addressed to transition an "AM opportunity" into a viable business case.

show abstract

Influence of modified processing on structure and properties of hot isostatically pressed superalloy Inconel 718

Cited by 92 publications

References 11 publications

Additively Manufactured Inconel 718 : Microstructures and Mechanical Properties

Additively Manufactured Inconel 718 : Microstructures and Mechanical Properties

Improvement in the Microstructure and Tensile Properties of Inconel 718 Superalloy by HIP Treatment

Additively Manufactured INCONEL® Alloy 718

Contact Info

Product

Resources

About

Influence of modified processing on structure and properties of hot isostatically pressed superalloy Inconel 718

Cited by 92 publications

References 11 publications

Additively Manufactured Inconel 718 : Microstructures and Mechanical Properties

Additively Manufactured Inconel 718 : Microstructures and Mechanical Properties

Improvement in the Microstructure and Tensile Properties of Inconel 718 Superalloy by HIP Treatment

Additively Manufactured INCONEL&reg; Alloy 718

Contact Info

Product

Resources

About

Additively Manufactured INCONEL® Alloy 718