Characterisation of secondary phases in Ni-base superalloy Rene 65

Wójcik, Tomasz; Rath, Markus; Kozeschnik, Ernst

doi:10.1080/02670836.2018.1505227

Cited by 12 publications

(2 citation statements)

References 23 publications

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“…Six manuscripts from symposium D2 describe studies on metallic alloys, semiconductors, as well as oxides: on metals, Wojcik et al [1] describe transmission electron microscopy (TEM) measurements of the sizes and morphologies of γ ' precipitates (Ni 3 (Ti,Al) of ordered L1 2 type), as well as borides at grain boundaries, as function of cooling rates in a new high temperature Ni-base alloy for future turbine blade manufacturing. Cutrano and Lekka [2] employ density functional theory (DFT) to model the electronic and magnetic properties of icosahedral FeCo magnetic nanoclustes and compare them to FeCu clusters and thin films en route to environmentally sustainable smart magnetic alloys.…”

Section: Materials Characterisation and Modelling On The Small Scalementioning

confidence: 99%

Materials characterisation and modelling on the small scale

Dimitrakopulos

Walther

Pinna

et al. 2018

Materials Science and Technology

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Section: Materials Characterisation and Modelling On The Small Scalementioning

confidence: 99%

Materials characterisation and modelling on the small scale

Dimitrakopulos

Walther

Pinna

et al. 2018

Materials Science and Technology

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“…Generally, the alloy used relies on carefully tailored compositions and heat-treatment schedules that result principally in a microstructure constituting of the γ phases [6][7][8][9][10][11][12]. It is typically subjected to three-stage supersolvus or subsolvus standard heat treatment for the alloy as follows.…”

Section: Introductionmentioning

confidence: 99%

Influence and Sensitivity of Temperature and Microstructure on the Fluctuation of Creep Properties in Ni-Base Superalloy

et al. 2020

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In this work, the sensitivity zone of microstructure and temperature for precipitation-strengthened nickel-based superalloys, used for turbine applications in aero-engines, has been firstly established. Heat treatment experiments with different solution temperatures were carried out. The microstructure evolution and creep residual strain sensitivity, low cycle fatigue properties, and tensile properties are analyzed, and the essential reason for the fluctuation of the mechanical properties of nickel-based superalloys was revealed. The main results obtained are as follows: following subsolvus solution heat treatment with a temperature of 1020 °C, samples have a high primary γ′I phase content, which is beneficial to low creep residual strain. Above the supersolvus solution temperature of 1040 °C, the creep residual strain value and low cycle fatigue performance fluctuate significantly. The essential reason for the dramatic fluctuation of performance is the presence of γ′ phases in different sizes and quantities, especially following the solution heat treatment in the temperature-sensitive zone of the γ′I phase, which is likely to cause huge fluctuations in the microstructure of tertiary γ′III phases. A zone of particular sensitivity in terms of temperature and microstructure for the γ′I phase is proposed. The range of suitable solution temperatures are discussed. In order to maintain stable mechanical properties without large fluctuations, the influence of the sensitivity within this temperature and microstructure zone on the γ′ phase should be considered.

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Review of Microstructure–Mechanical Property Relationships in Cast and Wrought Ni‐Based Superalloys with Boron, Carbon, and Zirconium Microalloying Additions

et al. 2022

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Cast and wrought Ni‐based superalloys are materials of choice for harsh high‐temperature environments of aircraft engines and gas turbines. Their compositional complexity requires sophisticated thermo‐mechanical processing. A typical microstructure consists of a polycrystalline γ‐matrix, strengthening Ni3(Al,Ti) γ′ precipitates, carbides (MC, M6C, and M23C6), borides (M2B, M3B2, and M5B3), and other inclusions. Microalloying additions of B, C, and Zr commonly improve high‐temperature strength and creep resistance, although excessive additions are detrimental. Grain boundary (GB) segregation may improve cohesion and displace embrittling impurities. Finely dispersed carbides and borides are desired to control grain size via GB pinning. However, excessive decoration of GBs may lead to failure during processing and in‐service. Hence, a systematic review on the roles of B, C, and Zr in cast and wrought Ni‐based superalloys is required. The current state of knowledge on GB segregation and precipitation is reviewed. Experimental and modeling results are compared across various processing steps. The impact of GB precipitation on mechanical properties is most well researched. Co‐precipitation in proximity to GBs interacting with local microstructure evolution and mechanical properties remains less explored. Addressing these gaps in knowledge allows a more complete understanding of processing–microstructure–properties relationships in advanced cast and wrought Ni‐based superalloys.

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Characterisation of secondary phases in Ni-base superalloy Rene 65

Cited by 12 publications

References 23 publications

Materials characterisation and modelling on the small scale

Materials characterisation and modelling on the small scale

Influence and Sensitivity of Temperature and Microstructure on the Fluctuation of Creep Properties in Ni-Base Superalloy

Review of Microstructure–Mechanical Property Relationships in Cast and Wrought Ni‐Based Superalloys with Boron, Carbon, and Zirconium Microalloying Additions

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