Computer simulations of NiCrAl multiphase diffusion couples

Morral, J. E.; ̊gren, J. A

doi:10.1016/s1359-6454(96)00219-4

Cited by 89 publications

(55 citation statements)

References 18 publications

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“…8, the composition changes rapidly at the transition between OBDZ and BLZ. So-called diffusion paths [40][41][42] are also shown in the phase diagrams in Fig. 8, which consist of several points fetched from the concentration profiles.…”

Section: High Temperature Oxidationmentioning

confidence: 99%

Modeling of microstructural evolution and lifetime prediction of MCrAlY coatings on nickel based superalloys during high temperature oxidation

Yuan

Eriksson

Peng

et al. 2013

Surface and Coatings Technology

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MCrAlY coatings are deposited onto superalloys to provide oxidation and corrosion protection at high temperature by the formation of a thermally grown oxide scale. In this project, the oxidation behaviour of a HVOF CoNiCrAlYSi coating on IN792 was studied for both isothermal oxidation (900, 1000 and 1100 °C) and thermal cycling (100-1100 °C). The microstructural evolution of the CoNiCrAlYSi coatings after oxidation was investigated. It was found that the Al-rich β phase is gradually consumed due to two effects: surface oxidation and coating-substrate interdiffusion. Some voids and oxides along the coating-substrate interface, or inside the coating, were considered to play a role in blocking the diffusion of alloying elements. Based on the microstructural observation, an oxidation-diffusion model, considering both surface oxidation and coating-substrate interdiffusion, was developed by using Matlab and DICTRA software to predict the useful life of MCrAlY coatings.A new concept of diffusion blocking is also introduced into the model to give more accurate description on the microstructural evolution. The results from modeling and the experimentally established composition profiles showed good agreement.

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Section: High Temperature Oxidationmentioning

confidence: 99%

Modeling of microstructural evolution and lifetime prediction of MCrAlY coatings on nickel based superalloys during high temperature oxidation

Yuan

Eriksson

Peng

et al. 2013

Surface and Coatings Technology

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show abstract

“…This approach was then used by several authors. For example, Hopfe and Morral [33] derived analytical approximations that allowed them to consider many different cases and Engstro¨m et al [34] derived a fully numerical procedure that was implemented in DICTRA and allowed them to simulate internal carbide formation during carburizing of Ni-Cr alloys. The latter method was applied by Helander et al [35,36] to joints between an austenitic stainless steel and a low alloy steel, a problem of direct industrial importance.…”

Section: Diffusion In Dispersed Systemsmentioning

confidence: 99%

Thermodynamics and Diffusion Coupling in Alloys—Application-Driven Science

Ågren

2011

Metall Mater Trans A

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As emphasized by Stokes (1997), the common assumption of a linear progression from basic research (science), via applied research, to technological innovations (engineering) should be questioned. In fact, society would gain much by supporting long-term research that stems from practical problems and has usefulness as a key word. Such research may be fundamental, and often, it cannot be distinguished from ''basic'' research if it were not for its different motivation. The development of the Calphad method and the more recent development of accompanying kinetic approaches for diffusion serve as excellent examples and are the themes of this symposium. The drivers are, e.g., the development of new materials, processes, and lifetime predictions. Many challenges of the utmost practical importance require long-term fundamental research. This presentation will address some of them, e.g., the effect of various ordering phenomena on activation barriers, and the strength and practical importance of correlation effects.

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“…61 After each diffusion step, the equilibrium corresponding to the new average composition is calculated at every spatial point inside the considered system, and the corresponding equilibrium calculations are made anew using the Thermo-Calc software. 62 This procedure ensures that all composition and phase-fraction profiles are updated.…”

Section: Diffusion Modelingmentioning

confidence: 99%