Metallurgical Stability of Inconel Alloy 718

Brooks, Jeffery; Bridges, P. J.

doi:10.7449/1988/superalloys_1988_33_42

Cited by 99 publications

(92 citation statements)

References 0 publications

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“…Since the pioneering work by Eisels tein, many investigators have produced TTT diagrams determined on alloys solution treated to be strain free. [2][3][4][5][6] All these latter studies differed from the former one by the fact that a brittle Laves phase was not found to precipitate at short holding time as reported by Eiselstein and another fact that the delta phase formed in shorter times than that reported by Eiselstein. Recently V. Beaubois et al [7] further studied short term precipitation kinetics of delta phase in strain free 718 alloy.…”

Section: Introductioncontrasting

confidence: 46%

TTT Diagram of a Newly Developed Nickel-Base Superalloy - Allvac 718Plus

Xie¹,

Xu²,

Wang³

et al. 2005

Superalloys 718, 625, 706 and Various Derivatives (2005)

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A new nickel-base superalloy designated as Allvac ® 718Plus ™ has been developed by ATI Allvac to be used at 700°C. For phase characterization, heat treatment selection and structure stability evaluation in high temperature range, the determination of TTT diagram for alloy 718Plus is not only a basic research issue but also an important matter for the alloy application at high temperatures. The conventional alloy 718 has been also studied for comparison. Both alloys were solution treated at 1040°C for full solution of precipitated phases except stable carbide MC. After solution treatment both alloy samples were heat treated at 649 to 954°C for the times from 3-6 minutes till 100 hrs. Phase identification was mainly by means of SEM, XRD and partially TEM and SAD. Hardness test was also conducted on the samples as the indication of γ" and γ' precipitation hardening. The experimentally determined T-T-T diagrams and discussion on the phase formation in alloys 718 and 718Plus are described in this paper.

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Section: Introductioncontrasting

confidence: 46%

TTT Diagram of a Newly Developed Nickel-Base Superalloy - Allvac 718Plus

Xie¹,

Xu²,

Wang³

et al. 2005

Superalloys 718, 625, 706 and Various Derivatives (2005)

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“…This diagram shows that in homogenized alloy 718 only γ′, γ′′ and δ are formed subsequent to hot working and an anneal at 1000°C/15 minutes. In this diagram, the primary carbides and any potential TiN are not depicted nor is Laves shown in confirmation of the results of Decker (46) and that of Brooks and Bridges (47). Interestingly, because the alloy contained 0.07% silicon, the primary MC carbides did not transform to M 6 C type carbides.…”

Section: Metallurgical Behavior Of Niobium In Alloy 718supporting

confidence: 71%

The Role of Niobium in Wrought Precipitation-Hardened Nickel-Base Alloys

Smith¹,

Patel²

2005

Superalloys 718, 625, 706 and Various Derivatives (2005)

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Niobium is recognized as an important alloying element in a number of wrought precipitation-hardened nickel-base alloys. It is the purpose of this paper to examine the role that niobium plays in these alloys and describe the properties that are achieved as a result of its inclusion in wrought superalloys. In addition to the general alloying characteristics of niobium as described in the technical literature, the specific contribution of niobium in the alloys X-750, 740, 706, 725 and 718 will be examined. Niobium is examined for the role it plays microstructurally and the impact of the resulting microstructure on certain properties.

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“…More recently in the 1988 Seven Springs meeting, Brooks and Bridges studied the behavior of phases in alloy 718 which was exposed up to 10,000 hours in a temperature range of 500°C to 1000°C (5). In the 10,000 hour exposed material they confirmed the aCr phase at the grain boundaries, but no Laves was present.…”

Section: Introductionmentioning

confidence: 87%