Modelling the Material Properties and Behaviour of Ni-Based Superalloys

Saunders, N.; Guo, Zhan Li; Li, X.; Miodownik, A. P.; Gu, Guildford

doi:10.7449/2004/superalloys_2004_849_858

Cited by 50 publications

(31 citation statements)

References 31 publications

(40 reference statements)

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“…The predictive results of microstructure modeling software package JMatPro_Ni-4.0 (Saunders and Guo, 2004) are being compared to the experimentally determined phase formation as functions of time and temperature. Typical predictive results likewise are shown in Fig.…”

Section: Alloy Stabilitymentioning

confidence: 99%

Creep Property Characterization of Potential Brayton Cycle Impeller and Duct Materials

Gabb

Gayda²,

Garg³

2007

AIP Conference Proceedings

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Abstract. Cast superalloys have potential applications in space as impellers within closed-loop Brayton cycle nuclear power generation systems. Likewise wrought superalloys are good candidates for ducts and heat exchangers transporting the inert working gas in a Brayton-based power plant. Two cast superalloys, Mar-M247LC and IN792, and a NASA GRC powder metallurgy superalloy, LSHR, have been screened to compare their respective capabilities for impeller applications. Mar-M247LC has been selected for additional long term evaluations. Initial tests in helium indicate this inert environment may debit long term creep resistance of this alloy. Several wrought superalloys including Hastelloy® X, Inconel® 617, Inconel® 740, Nimonic® 263, Incoloy® MA956, and Haynes 230 are also being screened to compare their capabilities for duct applications. Haynes 230 has been selected for additional long term evaluations. Initial tests in helium are just underway for this alloy. These proposed applications would require sufficient strength and creep resistance for long term service at temperatures up to 1200 K, with service times to 100,000 h or more. Therefore, long term microstructural stability is also being screened.

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Section: Alloy Stabilitymentioning

confidence: 99%

Creep Property Characterization of Potential Brayton Cycle Impeller and Duct Materials

Gabb

Gayda²,

Garg³

2007

AIP Conference Proceedings

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“…Tools that utilise thermodynamic modelling for exploring the equilibrium and phase relationships in complex materials are being increasingly used in industrial practice for Ni-and NiFe-based superalloys [1,2]. These tools provide significant benefit, but their applicability often falls short from directly providing the information that is actually required.…”

Section: Introductionmentioning

confidence: 99%

Modelling the Material Properties and Behaviour of Ni- and NiFe-Based Superalloys

Saunders¹,

Guo²,

Miodownik³

et al. 2005

Superalloys 718, 625, 706 and Various Derivatives (2005)

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Over the past decade thermodynamic models have become increasingly used for Ni-and NiFebased superalloys. However, their applicability often falls short from directly providing the information that is actually required. To overcome such limitations a new computer programme has been developed, called JMatPro (an acronym for Java-based Materials Properties software). The properties which can be calculated are wide ranging, including thermo-physical and physical properties (from room temperature to the liquid state), TTT/CCT diagrams, coarsening of ' and ", and mechanical properties. It should be noted that the mechanical properties are calculated as a function of temperature and strain rate up to the melting point. Stress/strain diagrams at any given temperature and strain rate can also be generated. The creep properties that JMatPro provides include steady creep rate, rupture life and rupture strength. A feature of the new programme is that the calculations are based, as far as possible, on sound physical principles rather than purely statistical methods. Thus many of the shortcomings of methods such as regression analysis can be overcome. It allows sensitivity to microstructure to be included for many of the properties and also means that the true inter-relationship between properties can be developed, e.g. in the modelling of creep and precipitation hardening. The purpose of the present paper is to describe the technical background behind the new programme, giving extensive examples of its application and use for superalloys of the 718, 625, 706 and derivative types.

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“…As soon as the temperature passes the M S-temperature, the remaining austenite starts being transformed to martensite. There exist several tools to compute a TTT-diagram from the material's chemical composition and initial grain size [7,8,9]. The one used by the authors is presented in the following.…”

Section: Introductionmentioning

confidence: 99%

A new optimization procedure for the accurate characterization of thermal phase transformation curves based on controlled quenching experiments

et al. 2016

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Abstract. Precise hardness and phase content prediction for quenched steel with the finite element method requires optimal material data, which is usually obtained from measured continuous cooling transformation (CCT) diagrams. However, most software packages that are able to predict final phase composition require time temperature transformation (TTT) diagrams. TTT diagrams can be calculated from the chemical composition of the material. With this methods the numerical prediction often result in deviations to reality. A newly developed optimization method can improve the accuracy of phase content and hardness prediction after quenching by optimizing the TTT diagram with measured data of controlled quenching experiments.

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Modelling the Material Properties and Behaviour of Ni-Based Superalloys

Cited by 50 publications

References 31 publications

Creep Property Characterization of Potential Brayton Cycle Impeller and Duct Materials

Creep Property Characterization of Potential Brayton Cycle Impeller and Duct Materials

Modelling the Material Properties and Behaviour of Ni- and NiFe-Based Superalloys

A new optimization procedure for the accurate characterization of thermal phase transformation curves based on controlled quenching experiments

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