Effect of Thermal Exposure on Microstructural Evolution in Alloy 718 Fasteners

Radavich, J.F.; Lawless, B.H.

doi:10.7449/2001/superalloys_2001_433_442

Cited by 3 publications

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Overview on 718Plus(®) Assessment within “VITAL” Project

Ruiz¹,

Sjöberg

Gómez-Acebo

2010

Superalloy 718 and Derivatives

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Alloy Allvac 718Plus has been marketed by Allvac claiming better mechanical properties at temperatures where In718 has already exhausted its applicability, above the 650ºC range. Allvac 718Plus also assures that it holds improved metallurgical stability at even higher temperatures, up to 700ºC. In this upper range, no degradation of mechanical properties is said to happen in the new alloy. A European R&D project named VITAL dedicated part of its efforts to assess these claims and verify the improvements.Castability and forgeability assessments where completed, together with trials on weldability of the alloy. Mechanical tests and microstructural assessments on both alloys, 718 and 718Plus, in both materials forms, cast and wrought, and two different material conditions, as-heat treated and exposed to service temperatures, were completed and direct comparisons then established.

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Overview on 718Plus(®) Assessment within “VITAL” Project

Ruiz¹,

Sjöberg

Gómez-Acebo

2010

Superalloy 718 and Derivatives

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Effect of long-time exposure on the evolution of minor phases in Alloy 718

Srinivasan¹

2004

Materials Science and Engineering: A

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Long Time Stability of Direct Aging GH4169G Alloy Forging Disc after Thermal Exposure at 650°C

Zhang

et al. 2022

MSF

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An isothermal aging study was carried out on direct aging GH4169G alloy forging disk for up to 10000 hours at 650°C. The evolution of microstructure and mechanical properties of the alloy were systematically studied via scanning electron microscope (SEM), transmission electron microscope (TEM) and physicochemical phase analysis. The results show that the size of main strengthening phases γ′′ and γ′ in GH4169G alloy direct aging disk increases gradually, while their quantity decreases with prolonging aging time. The total amount of γ′′ and γ′ is 14.1% at as-heat treated condition, which decreases by 3.1% at 10000h. The amount of δ phase increases gradually, and the content of δ phase reaches 5.4% at 10000h, which increases nearly twice. The α-Cr phase adjacent to the δ phase on the grain boundaries shows a parabolic increase in its content, and reaches 2.231% at 10000h. The yield strength, stress rupture life shows varying degrees of reductions as prolonging thermal aging time.

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Effect of Thermal Exposure on Microstructural Evolution in Alloy 718 Fasteners

Cited by 3 publications

References 0 publications

Overview on 718Plus(®) Assessment within “VITAL” Project

Overview on 718Plus(®) Assessment within “VITAL” Project

Effect of long-time exposure on the evolution of minor phases in Alloy 718

Long Time Stability of Direct Aging GH4169G Alloy Forging Disc after Thermal Exposure at 650°C

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