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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Microstructural Template Consisting of a Face-Centered Cubic Matrix with Ordered Precipitates: Microstructural Evolution and Properties
Presentation Title Correlative High-resolution Characterization of the Early Stages of Precipitation During Direct Aging of Alloy 718
Author(s) Felix Theska, Vitor V. Rielli, Keita Nomoto, Flora Godor, Bernd Oberwinkler, Aleksandar Stanojevic, Simon P. Ringer, Sophie Primig
On-Site Speaker (Planned) Felix Theska
Abstract Scope Alloy 718 is a polycrystalline, precipitation strengthened Ni-based superalloy used for aircraft engine turbine discs. High-temperature yield strength and creep resistance are achieved by precipitation of nanoscale γ'- (L12 Ni3(Al,Ti)) and γ"- (D022 Ni3(Nb)) particles via coherency and anti-phase boundary strengthening. Compared to conventional ageing, yield strength increments of +10% are achieved via direct ageing by changes in the δ-phase volume fraction, dislocation density, and γ'- and γ"-precipitate duplet and triplet morphology. However, the detailed γ'- and γ"-precipitate nucleation and growth mechanisms during direct ageing of Alloy 718 remain unknown. Therefore, various high-resolution transmission electron microscopy (HR-TEM) and atom probe microscopy (APM) techniques were used to study the early stages of precipitation for γ'- and γ"-particle volume fraction, radii, density, and morphology. A qualitative microstructural model is introduced to discuss heterogeneous versus homogeneous precipitate nucleation and growth, based on dislocation-precipitate interaction and γ'- and γ"-precipitate morphology evolution.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


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Coarsening and Creep Behavior of Co-Ni-Al-W-Ti-Ta-B Superalloy with High γ′ Solvus Temperature
Coarsening Kinetics and Mechanical Properties of fcc Compositionally Complex Alloys Strengthened by L12 Precipitates
Correlative High-resolution Characterization of the Early Stages of Precipitation During Direct Aging of Alloy 718
D022 + D022’ Dual-phase Microstructure in As-cast Al-Mo-Ti Alloys
Elevated Temperature Microstructure Evolution and Properties of an Equiatomic CrCoNi Superalloy Containing Al,Ti
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Novel Microstructural Template Based on Ordered Intermetallic Precipitation in FCC Based Complex Concentrated Alloys
Ordered Precipitates and Mechanical Properties of Nickel-base Superalloys Studied by Analytical Scanning and Transmission Electron Microscopy
Precipitation and Deformation Mechanisms of γ’/γ” Co-precipitates in Alloy 718
Sc-free Nanoprecipitate-strengthened Aluminum Alloys with Exceptional Creep Resistance
Stress Induced Sensitization in HAZ of 304 LN Austenitic Stainless Steel
The Quantitative Model for Heat Treatment Parameters and Gamma Prime Variations on Nickel-base Superalloys

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