In-situ Electrical Resistivity Measurements for Determining Formation Kinetics of the y' Phase in Nickel-based Wrousht Superalloys

Rosen, G.I.; Dirnfeld, S. F.; Bamberger, Μ.; Prinz, B.

doi:10.1515/ijmr-1994-850211

Cited by 3 publications

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“…Electrical resistivity measurements in the transition ranges have been observed to change with time of annealing. 15 The increases in C p linked to the coarsening and the dissolution of the c9 phase suggested that these transitions are considered to be first order, i.e. they are associated with an enthalpy of transition (DH tr ) which is manifested by an apparent increase in C p (in a similar way to values recorded for the fusion process, see Fig.…”

Section: Resultsmentioning

confidence: 64%

Measurement and estimation of thermophysical properties of nickel based superalloys

Quested¹,

Brooks²,

Chapman³

et al. 2009

Materials Science and Technology

129

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Thermophysical properties for the solid and liquid phases of several Ni based superalloys (CMSX-4, CMSX-10, CM186LC, IN 738 and Rene 80) have been measured. The following properties were measured: heat capacity and enthalpy, thermal expansion coefficient and density, thermal diffusivity, viscosity and surface tension. Analysis of these measurements showed that that γ′ phase (Ni3Al) affected the values for the following properties; Cp, enthalpy, electrical resistivity, thermal diffusivity and conductivity. Relationships have been identified between properties and the γ′ phase content (which can be represented by mass% Al in the alloy). These relations were then used to calculate property values of the alloys from chemical composition. Other relations were developed to estimate the viscosities and surface tensions of Ni based superalloys. The predicted property values were found to be in good agreement with the measured values.

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Section: Resultsmentioning

confidence: 64%

Measurement and estimation of thermophysical properties of nickel based superalloys

Quested¹,

Brooks²,

Chapman³

et al. 2009

Materials Science and Technology

129

View full text Add to dashboard Cite

show abstract

Creep investigation of commercial and improved nickel-based wrought superalloys

Rosen

Dirnfield

Bamberger

et al. 1993

Materials Science and Engineering: A

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The Effect of Aluminium Content on Thermophysical Properties of Ni-based Superalloys

Mills

Youssef

2006

ISIJ Int.

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Ni 3 Al is the principal component in the gЈ phase formed in Ni-based superalloys but Ni 3 Cr and Ni 3 Fe can also contribute to the gЈ phase at temperatures below 820 K. Approximate values for the gЈ phase content can be derived from a relationship based on (mass% Al). In a previous publication it was shown that the density in both the solid and liquid alloys was dependent upon the gЈ phase (or Al) contents in the alloy. Consequently, the effect of the gЈ phase on other thermophysical properties (C p , enthalpy, electrical resistivity, thermal conductivity and diffusivity) have been investigated. Linear relations were found between the property values around 300 K and the mass% Al. It was also found that property-temperature relationships were also affected by the gЈ phase (or Al) contents. Although it is known that the strong bonding between Ni and Al atoms affects the density of liquid alloys, we were unable to establish any such relationship for the other properties for liquid alloys because of the large experimental uncertainties in the measurements of these properties. This study has revealed that there is an urgent need for accurate values for C p , electrical resistivity, thermal diffusivity and conductivity for liquid, Ni-based superalloys.KEY WORDS: Ni-based superalloys; gЈ phase; heat capacity; enthalpy; electrical resistivity; thermal conductivity; thermal diffusivity. structural factors in the alloy when compared with other properties. Consequently, it would be expected that other properties may be affected by the gЈ phase content. In this paper we examine the effect of gЈ phase (via the Al content) on other thermophysical properties for solid and liquid Ni-based superalloys. Database and Treatment of DataThermophysical property data have been reported for a number of Ni-based superalloys; the chemical compositions for these alloys are given in Table 1.In this paper all temperatures are expressed as thermody- 3. Thermal Expansion Coefficient (a a ) and Density (r r )The density and the linear thermal expansion coefficient (a) were found to be functions of the gЈ phase content (or Al content).3) The difference in density, Dr 296 ϭr 298 meas Ϫ r 298 ideal , was found to increase with increasing gЈ phase and/or Al contents, (Eqs. (4) and (5), respectively). The thermal expansion coefficients for solid alloys were found to decrease with increasing gЈ phase or Al content as can be seen from Fig. 2. Thermal expansion data were collated and divided into three groups based on the Al content, namely, (0-0.5 mass%), (3-4 mass%) and (5-5.8 mass%). Vol. 46 (2006) The mean values for each group were determined and are shown in Fig. 2. It can also be seen from this figure that the slope of all three curves flatten around 870 K and that the coarsening and dissolution of the gЈ phase is accompanied by an increase in slope for the alloys with high gЈ content (CMSX 4 and Rene 80). Heat Capacity (C p ) and Enthalpy (H T ؊H 298 )The enthalpy and C p are not particularly sensitive to structure and consequently, Kopp's...

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In-situ Electrical Resistivity Measurements for Determining Formation Kinetics of the y' Phase in Nickel-based Wrousht Superalloys

Cited by 3 publications

References 0 publications

Measurement and estimation of thermophysical properties of nickel based superalloys

Measurement and estimation of thermophysical properties of nickel based superalloys

Creep investigation of commercial and improved nickel-based wrought superalloys

The Effect of Aluminium Content on Thermophysical Properties of Ni-based Superalloys

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