Local Order and Mechanical Properties of the &amp;#947; Matrix of Nickel-Base Superalloys

Clément, N.; Coujou, A.; Jouiad, Mustapha; Caron, Pierre; Kirchner, H. O. K.; Khan, T.

doi:10.7449/1996/superalloys_1996_239_248

Cited by 9 publications

(7 citation statements)

References 9 publications

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“…Clement et al [22] examined the deformation of solid solution nickel alloys with a composition approaching that of the ␥ phase in nickel-based superalloys. Transmission electron microscopy (TEM) observations of the alloys were only able to confirm the presence of precipitates after an annealing heat treatment; in the unannealed samples the precipitates were presumed to be too fine to be observed.…”

Section: Discussionmentioning

confidence: 99%

Modeling solid solution strengthening in nickel alloys

Roth

Davis

Thomson

1997

Metall Mater Trans A

310

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The yield stress of multicomponent nickel solid solution alloys has not been modeled in the past with respect to the effects of composition and temperature. There have been investigations of the effect on the yield stress of solutes in binary systems at a fixed temperature, but the effects on the yield stress of multiple solute elements and temperature changes have not been investigated. In this article, two different forms of the trough model are considered for nickel-base alloys to determine the most applicable model for solid solution strengthening in the system. The yield stresses of three binary nickel-chromium and three ternary nickel alloys were determined at a range of temperatures. The yield stress of the alloys was then modeled using the Feltham equation. The constants determined in fitting the Feltham equation to the experimental data were then applied to other experimental solid solution alloys and also to published information on commercial solid solution nickel alloys. It was found that the yield stress of the nickel solid solution alloys could be modeled successfully using the Feltham equation.

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Section: Discussionmentioning

confidence: 99%

Modeling solid solution strengthening in nickel alloys

Roth

Davis

Thomson

1997

Metall Mater Trans A

310

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“…Moreover, a temperature dependence of s SS was also taken into account. This dependence is fitted from the experimental data summarized by Clé ment et al [24]. As reproduced in Fig.…”

Section: Temperature Dependence Of the Crssmentioning

confidence: 97%

“…[25] and filled triangles for the Demura et al model [16]) and Ni solid solution [24] are reproduced. For these simulations f ¼ 0.73, w ¼ 65 nm, and g APB as explained in the text.…”

Section: Acknowledgementsmentioning

confidence: 99%

Dislocation dynamics simulations of precipitation hardening in Ni-based superalloys with high γ′ volume fraction

2009

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“…These parameters were used directly. To obtain the effect of temperature, the data summarized by Roth et al and those of Clement et al 11,12 and Nitz et al 13 were used to derive a semi-empirical relation between chemistry, temperature and friction stress. The form used for the friction stress is given by the following equation (ref.…”

Section: Matrix and Precipitate Friction Stressesmentioning

confidence: 99%

A Fast Spreadsheet Model for the Yield Strength of Superalloys

Parthasarathy¹,

Rao²,

Dimiduk³

2004

Superalloys 2004 (Tenth International Symposium)

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Simulation methods allow the possibility of overcoming some of the deficiencies of analytical models. In a recent work, we have developed a numerical model (the details of which are published elsewhere 7 ) that considers the actual microstructure of a superalloy and uses accurate descriptions of dislocation behavior to predict the critical resolved shear stress for a given microstructure. This numerical model captures the physics of the problem accurately (for cutting via single APB-coupled dislocation pairs and bowing-assisted cutting), but is computationally expensive. In this work, we present an approach that uses the numerical discrete dislocation (DD) model to build a fast spreadsheet model that may be of industrial use.A methodology to rapidly evaluate the yield strength of superalloys using a fast spreadsheet model was explored. The results from a physics-based discrete dislocation simulation model were fit to polynomials. These were used along with appropriate heuristic logic, to develop a spreadsheet that can predict the yield strength from the composition, and microstructural parameters of an alloy. The model was compared with data available for a series of superalloys and found to have good correspondence. IntroductionThe nickel-based superalloys are a metallurgical marvel and have benefited from several decades of evolutionary changes. It is generally agreed by metallurgists that even in this class of the most evolved and complex alloys, the mechanical behavior is dictated almost entirely by the microstructure and chemistry of the phases. However it is also generally agreed that the ability to predict mechanical behavior poses great difficulties even when the microstructure and chemistry are well characterized in a given alloy. Of the various mechanical properties of design interest, the yield strength is likely the easiest to predict. There have been published works in which semi-empirical models were built using data from well-designed experiments with reasonable success. (see for example, Schirra 1 ) However for alloy design, and for studying effects of a wider range of variables, physics-based models are desired. The present work is an attempt at such a model. We begin with a brief description of the status of physicsbased models, to bring out the novelty of the present work.The paper is organized as follows. We start with a description of the microstructure as represented in the model, and a brief overview of the approach used to derive the spreadsheet model. We then present elements of this derivation, which include the numerical DD model. Next the results of a parametric study conducted using the physics-based numerical model is presented. The predicted dependence of the yield strength of superalloys on various microstrucutral parameters is shown. Finally the derivation of the spreadsheet model from these parametric studies is presented; the predictions of the spreadsheet model are shown compared with experimental data. Superalloy Microstructure Considered by the ModelThe focus of this...

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Local Order and Mechanical Properties of the γ Matrix of Nickel-Base Superalloys

Cited by 9 publications

References 9 publications

Modeling solid solution strengthening in nickel alloys

Modeling solid solution strengthening in nickel alloys

Dislocation dynamics simulations of precipitation hardening in Ni-based superalloys with high γ′ volume fraction

A Fast Spreadsheet Model for the Yield Strength of Superalloys

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