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Dive into the research topics where Rishi Pillai is active.

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Featured researches published by Rishi Pillai.


Materials at High Temperatures | 2015

Modelling compositional changes in nickel base alloy 602 CA during high temperature oxidation

A. Chyrkin; W. G. Sloof; Rishi Pillai; Timur Galiullin; D. Grüner; Lorenz Singheiser; W. J. Quadakkers

Abstract The high chromium nickel base alloy 602 CA is used as construction material for high temperature components in aggressive environments such as gas burners or heat exchangers. The high temperature oxidation behaviour of this alloy is characterised by the formation of an external Cr2O3 scale and internal precipitation of alumina. The main goal of the present investigation was to elucidate the effect of aluminum on the subscale chromium depletion phenomena. The chromium concentration profiles were found to be flat and sometimes even increasing towards the oxide-alloy interface. The experimental observations were interpreted in terms of alloy thermodynamics, i.e. effect of oxidation induced compositional changes on chemical potentials of the alloy constituents. The concentration profiles in alloy 602 CA observed during high temperature exposure were modelled using the CALPHAD approach for thermodynamic and kinetic calculations. Thermodynamic calculations revealed that the Al depletion in the alloy subsurface due to internal alumina precipitation leads to enhanced Cr diffusion towards the alloy surface.


Materials at High Temperatures | 2018

Predicting the microstructural evolution in a multi-layered corrosion resistant coating on a Ni-base superalloy

Rishi Pillai; Mary Taylor; Timur Galiullin; A. Chyrkin; Egbert Wessel; H.E. Evans; Willem J. Quadakkers

Abstract Protective metallic MCrAlY or diffusion type (NiAl) coatings enhance the oxidation and corrosion resistance of the underlying high temperature materials employed in aeroengines and industrial gas turbines by ensuring the growth of a slowly growing protective alumina scale. However, a chromia forming coating would provide a better resistance against sulphur induced corrosive attack. A hybrid coating system combining both chromia and alumina forming coating layers would provide optimum protection in oxidising-sulphidising environments. The microstructural stability and applicability of such a coating system (SmartCoat) containing alternate layers rich in chromium and aluminium respectively on the Ni-base superalloy CMSX-4 was evaluated after various exposure times at 800 C. Scanning electron microscopy (SEM) and electron microprobe analyses (EPMA) provided the element concentrations. Phases were identified by electron backscatter diffraction, and correlated with SEM and high-resolution TEM/EDX analyses. A computational approach was employed to describe the mechanisms of the phase transformations occurring in the coating system.


Materials at High Temperatures | 2015

A new computational approach for modelling the microstructural evolution and residual lifetime assessment of MCrAlY coatings

Rishi Pillai; W. G. Sloof; A. Chyrkin; Lorenz Singheiser; W. J. Quadakkers


Corrosion Science | 2015

Modeling carbide dissolution in alloy 602 CA during high temperature oxidation

A. Chyrkin; Rishi Pillai; H. Ackermann; H. Hattendorf; S. Richter; Wojciech Nowak; D. Grüner; W. J. Quadakkers


Surface & Coatings Technology | 2016

Carbides in an aluminised single crystal superalloy: Tracing the source of carbon

Rishi Pillai; A. Chyrkin; D. Grüner; Wojciech Nowak; N. Zheng; A. Kliewe; W. J. Quadakkers


Calphad-computer Coupling of Phase Diagrams and Thermochemistry | 2016

Methods to increase computational efficiency of CALPHAD-based thermodynamic and kinetic models employed in describing high temperature material degradation

Rishi Pillai; Timur Galiullin; A. Chyrkin; Willem J. Quadakkers


Corrosion Science | 2017

External α-Al 2 O 3 scale on Ni-base alloy 602 CA. – Part I: Formation and long-term stability

A. Chyrkin; Rishi Pillai; Timur Galiullin; Egbert Wessel; D. Grüner; W. J. Quadakkers


Corrosion Science | 2017

External α -Al2O3 Scale on Ni-Base alloy 602 CA – Part II: Microstructural Evolution

Rishi Pillai; A. Chyrkin; Timur Galiullin; Egbert Wessel; D. Grüner; W. J. Quadakkers


Oxidation of Metals | 2017

Predicting Oxidation-Limited Lifetime of Thin-Walled Components of NiCrW Alloy 230

Ran Duan; Aleksandra Jalowicka; Kinga A. Unocic; Bruce A Pint; Pawel Huczkowski; A. Chyrkin; D. Grüner; Rishi Pillai; Willem J. Quadakkers


Materials and Corrosion-werkstoffe Und Korrosion | 2017

Effect of gas flow rate on oxidation behaviour of alloy 625 in wet air in the temperature range 900-1000 °C: Effect of gas flow rate on oxidation behaviour of alloy 625

Pawel Huczkowski; H.-H. Angermann; Rishi Pillai; W. J. Quadakkers; Daniel Grüner; A. Chyrkin; Werner Lehnert; Elham Hejrani

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A. Chyrkin

Forschungszentrum Jülich

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Timur Galiullin

Forschungszentrum Jülich

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D. Grüner

Forschungszentrum Jülich

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Dmitry Naumenko

Forschungszentrum Jülich

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Egbert Wessel

Forschungszentrum Jülich

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Daniel Grüner

Forschungszentrum Jülich

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