Impact of the Solution Cooling Rate and of Thermal Aging on the Creep Properties of the New Cast &amp; Wrought René 65 Ni‐Based Superalloy

Aude, Laurence; Cormier, Jonathan; Villechaise, Patrick; Billot, Thomas; Franchet, Jean‐Michel; Pettinari‐Sturmel, Florence; Hantcherli, Muriel; Mompiou, Frédéric; Wessman, Andrew

doi:10.1002/9781119016854.ch27

Cited by 15 publications

(10 citation statements)

References 13 publications

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“…Since the cooling rate from super-solvus solution heat treatment controls the kinetics of the secondary and tertiary γ′ precipitation, it determines to a large extent the morphology, size, and distribution of the precipitate. Primarily, the size of the precipitated γ′ is largely controlled by the cooling rate of the super-solvus temperature, as shown by previous experimental studies [ 3 , 4 , 5 , 6 , 7 ], with the average γ′ particle size decreasing with increasing cooling rates. As in many precipitation-hardened systems, the mechanical properties of nickel-based superalloys are strongly influenced by the precipitate size distribution (PSD), as it exerts control over dislocation motion.…”

Section: Introductionmentioning

confidence: 69%

“…The authors identified the power law parameters A , n as 326.41, 0.2542 and 840.88, 0.3113 for the sub-solvus and super-solvus solution treatments, respectively. Later studies by Laurence et al [ 6 ] also expressed the γ′ precipitate size evolution as a function of cooling rate from sub-solvus solution treatment for R65 alloy using a power law relationship. The parameters determined here were A = 364.74 and n = 0.3977.…”

Section: Derivation Of the Correlationmentioning

confidence: 99%

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On the Dependence of γ′ Precipitate Size in a Nickel-Based Superalloy on the Cooling Rate from Super-Solvus Temperature Heat Treatment

Papadaki

Korsunsky

2018

Materials

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The ability to predict the sizes of secondary and tertiary γ′ precipitate is of particular importance for the development and use of polycrystalline nickel-based superalloys in demanding applications, since the size of the precipitate exerts a strong effect on the mechanical properties. Many studies have been devoted to the development and application of sophisticated numerical models that incorporate the influence of chemical composition, concentration gradients, and interfacial properties on precipitate size and morphology. In the present study, we choose a different approach, concentrating on identifying a correlation between the mean secondary and tertiary γ′ size and the cooling rate from solution treatment temperature. The data are collected using the precipitate size distribution analysis from high-resolution scanning electron microscopy. This correlation is expressed in the form of a power law, established using experimental measurement data and rationalized using a re-derivation of McLean’s theory for precipitate growth, based on well-established thermodynamic principles. Specifically, McLean’s model is recast to consider the effect of cooling rate. The derived model captures the correlation correctly despite its simplicity, and is able to predict the mean secondary and tertiary γ′ precipitate size in a nickel superalloy, without complex modeling.

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Section: Introductionmentioning

confidence: 69%

Section: Derivation Of the Correlationmentioning

confidence: 99%

On the Dependence of γ′ Precipitate Size in a Nickel-Based Superalloy on the Cooling Rate from Super-Solvus Temperature Heat Treatment

Papadaki

Korsunsky

2018

Materials

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“…However, processing of components involves many different steps in addition to the "state-of-the-art" solution and aging heat treatments and industrial practices may lead, sometimes, to variation in cooling rates at the end of, e.g., the solution treatment. If the effect of the ST cooling rate has been widely studied for polycristalline disk alloys [123][124][125], very few papers have attempted to investigate this parameter on creep properties of Ni-based DS/SX alloys [72,74]. Figure 115 presents the consequences of this parameter on creep properties of AM3 alloy.…”

Section: ) Mechanical Properties Sensitivity To the Processing Parameters 41) Creep And Tensile Propertiesmentioning

confidence: 99%

Processing of directionally cast nickel-base superalloys: solidification and heat treatments

Cormier

Gandin

2022

Nickel Base Single Crystals Across Length Scales

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“…The material used in the present study is the γ/γ′ nickel based superalloy René 65, which has recently been developed by ATI Allvac and General Electric [15][16][17][18] . The austenitic FCC γ matrix is strengthened by a high volume fraction (~40%) of γ′ particles [LI 2 structure, Ni 3 (Al,Ti)].…”

Section: Materials and Surface Anomaliesmentioning

confidence: 99%

Assessment of specific contribution of residual stress generated near surface anomalies in the high temperature fatigue life of a René 65 superalloy

Gourdin

Cormier

Gardin

et al. 2016

Fatigue Fract Eng Mat Struct

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This study evaluates the influence of residual stresses induced by the fabrication of surface anomalies on the fatigue crack growth in a nickel based superalloy. To separate the notch effect of the geometry from the residual stress field induced by fabrication of the surface flaws, two V‐type anomalies are considered: scratches and dents with equivalent morphology and size. A specially designed heat treatment has been used to reduce the magnitude of residual stresses around these anomalies in order to highlight their effects on the different stages of the crack propagation, under low cycle fatigue conditions at 400 °C. The crack initiation life is short for both anomalies but in the presence of compressive residual stresses, a decrease of the fatigue crack growth rate has been observed during the first stages of the crack propagation. Furthermore, the results showed that without residual stresses, scratches and dents exhibit the same behaviour. Thus, the residual stress field below surface anomalies is the main parameter controlling the fatigue life from surface anomalies.

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Impact of the Solution Cooling Rate and of Thermal Aging on the Creep Properties of the New Cast & Wrought René 65 Ni‐Based Superalloy

Cited by 15 publications

References 13 publications

On the Dependence of γ′ Precipitate Size in a Nickel-Based Superalloy on the Cooling Rate from Super-Solvus Temperature Heat Treatment

On the Dependence of γ′ Precipitate Size in a Nickel-Based Superalloy on the Cooling Rate from Super-Solvus Temperature Heat Treatment

Processing of directionally cast nickel-base superalloys: solidification and heat treatments

Assessment of specific contribution of residual stress generated near surface anomalies in the high temperature fatigue life of a René 65 superalloy

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