The effect of cooling rate on the γ' composition, morphology and corrosion behaviour of IN738LC

Mallikarjuna, H.T.; Caley, W. F.; Richards, N.L.

doi:10.1016/j.corsci.2018.12.036

Cited by 32 publications

(5 citation statements)

References 20 publications

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“…Indeed, the thermal expansion coefficient of Si is much lower than that of Al, with the difference being higher than most other light-alloy-precipitate combinations. These effects can combine to cause the same phase to form in two morphologies, as also shown for Ni-based superalloys, for instance [165][166][167][168]. depletes the matrix, leading to a slowed reaction.…”

Section: Alsi Binary Wrought Alloysmentioning

confidence: 94%

Review of the Quench Sensitivity of Aluminium Alloys: Analysis of the Kinetics and Nature of Quench-Induced Precipitation

et al. 2019

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For aluminium alloys, precipitation strengthening is controlled by age-hardening heat treatments, including solution treatment, quenching, and ageing. In terms of technological applications, quenching is considered a critical step, because detrimental quench-induced precipitation must be avoided to exploit the full age-hardening potential of the alloy. The alloy therefore needs to be quenched faster than a critical cooling rate, but slow enough to avoid undesired distortion and residual stresses. These contrary requirements for quenching can only be aligned based on detailed knowledge of the kinetics of quench-induced precipitation. Until the beginning of the 21st century, the kinetics of relevant solid-solid phase transformations in aluminium alloys could only be estimated by ex-situ testing of different properties. Over the past ten years, significant progress has been achieved in this field of materials science, enabled by the development of highly sensitive differential scanning calorimetry (DSC) techniques. This review presents a comprehensive report on the solid-solid phase transformation kinetics in Al alloys covering precipitation and dissolution reactions during heating from different initial states, dissolution during solution annealing and to a vast extent quench-induced precipitation during continuous cooling over a dynamic cooling rate range of ten orders of magnitude. The kinetic analyses are complemented by sophisticated micro- and nano-structural analyses and continuous cooling precipitation (CCP) diagrams are derived. The measurement of enthalpies released by quench-induced precipitation as a function of the cooling rate also enables predictions of the quench sensitivities of Al alloys using physically-based models. Various alloys are compared, and general aspects of quench-induced precipitation in Al alloys are derived.

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Section: Alsi Binary Wrought Alloysmentioning

confidence: 94%

Review of the Quench Sensitivity of Aluminium Alloys: Analysis of the Kinetics and Nature of Quench-Induced Precipitation

et al. 2019

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“…Depending on the used parameters, planar, cellular, columnar, or equiaxed dendritic structure in the FZ was observed [11,17,19]. Also, the secondary γ precipitates size change was documented, depending on the used beam parameters, for RR1000 [20], IN 738LC [18], and IN 713C [11,21]. A higher cooling rate was always connected with finer microstructure.…”

Section: Introductionmentioning

confidence: 88%

“…A laser beam (LB) and electron beam (EB) surface treatment usually used for welding [11][12][13], forming [14], surface texturing [15], or quenching [16] are methods how to change the material surface structure and influence its chemical composition (elements redistribution). The structural changes occur due to fastheating, melting, even some elements evaporation, followed by rapid solidification and cooling of the surface remelted layer [17,18]. Cooling rate and various solidstate transformation reactions influence the development of the remelted zone's microstructure, consisting of fusion zone (FZ) and heat-affected zone (HAZ).…”

Section: Introductionmentioning

confidence: 99%

Comparison of the effect of EB and LB surface treatment on structural characteristics of IN 713LC superalloy

Švábenská¹,

Horník²,

Fintová³

2021

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Damage and oxidation resistance are properties characterizing Ni-based superalloys. However, besides the alloy composition, the mentioned properties depend on structural features such as grain and precipitates size. Surface structure refinement via laser beam (LB) and electron beam (EB) was performed on IN 713LC superalloy. The influence of both the treatments on material microstructure, chemical composition, microhardness, and oxidation resistance was examined. Both the treatments resulted in a refined structure of the remelted zone. A homogeneous 30-43 µm thick remelted zone was created by EB, while a non-homogeneous (semi-circular track) remelted zone (22-86 µm) was created by LB. EB treatment resulted in higher surface roughness; however, a smaller amount of cracks on the treated sample surface was observed compared to the LB treatment. An increase of surface microhardness by 38 % compared to the as-received material was reached regardless of the used treatment method. The impact of the treatment on oxidation resistance was studied after exposure to 800 • C for 24, 48, 72, and 96 hours in the ambient air. The created oxide layer consisted of internal Al2O3 and external Cr2O3 + NiCr2O4 layer. The oxide layer thickness differs in time; however, comparable oxide layer thickness was measured on all samples after 96 hours of oxidation.

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“…The high cooling rate helps to prevent any further nucleation events despite the nonequilibrium condition [51]. Therefore, the c 0 -precipitates in the brighter contrast region are likely to be the primary c 0precipitates with the mono-modal size distribution, rather than the secondary or tertiary c 0 -precipitates [51,53,54]. The observed cuboidal shape of these c 0 -precipitates with average size of 135 ± 7 nm can predicted by the phase-field modelling, where the spherical-to-cuboidal shape transition occurs in the particle size of 80 nm [55].…”

Section: Microstructure Formation Mechanisms In Sebm Single-crystal R...mentioning

confidence: 99%

High-Reliability Repair of Single-Crystal Ni-Base Superalloy by Selective Electron Beam Melting

Shen¹,

Gao²,

Hui³

et al. 2022

SSRN Journal

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The effect of cooling rate on the γ' composition, morphology and corrosion behaviour of IN738LC

Cited by 32 publications

References 20 publications

Review of the Quench Sensitivity of Aluminium Alloys: Analysis of the Kinetics and Nature of Quench-Induced Precipitation

Review of the Quench Sensitivity of Aluminium Alloys: Analysis of the Kinetics and Nature of Quench-Induced Precipitation

Comparison of the effect of EB and LB surface treatment on structural characteristics of IN 713LC superalloy

High-Reliability Repair of Single-Crystal Ni-Base Superalloy by Selective Electron Beam Melting

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