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Thermoelastic properties and c’-solvus temperatures of single-crystal Ni-base superalloys(7)
The Einstein model usually provides a good approximation of heat capacity and thermal expansion at temperatures above about hE/2. In the case of the superalloys investigated in this work, the Einsteinapproach describes well the observe...Views -
Thermoelastic properties and c’-solvus temperatures of single-crystal Ni-base superalloys(6)
Calculated and measured phase compositions: The compositions of the c- and c-phase ( & cc and cc&) in the four investigated alloys were measured with 3D APT (ERBO 1) [36] and with TEM-EDX (ERBO 15 and derivatives) [32]. The exper...Views -
Thermoelastic properties and c’-solvus temperatures of single-crystal Ni-base superalloys(5)
Results Elastic properties: The elastic stiffnesses of pseudosingle-crystal ERBO/15 and its variants as obtained by the RUS method at room temperature are presented in Table 4. For comparison, data for ERBO/1 from the literature [41] hav...Views -
Thermoelastic properties and c’-solvus temperatures of single-crystal Ni-base superalloys(4)
According to Demtro¨der et al. [41], the large-scale heterogeneities associated with the castmicrostructure (dendrites and interdendritic regions) can influence the resonances with wave lengths of the order of the dendrite spacing. Foll...Views -
Thermoelastic properties and c’-solvus temperatures of single-crystal Ni-base superalloys(3)
Figure 2 presents SEM micrographs of the eight material states, which were considered in the present work. The four as-cast materials states are presented in the upper row of Fig. 2. The fully heat-treated material states after the secon...Views -
Thermoelastic properties and c’-solvus temperatures of single-crystal Ni-base superalloys(2)
The present work investigates how much large (ERBO/1 vs. ERBO/15) and small (three ERBO/15 variants) variations in alloy composition affect their thermoelastic properties. First objective: The comparison of two different alloys (large va...Views -
Thermoelastic properties and c’-solvus temperatures of single-crystal Ni-base superalloys(1)
ABSTRACTThe present work shows that thermal expansion experiments can be used to measurethe c-solvus temperatures of four Ni-base single-crystal superalloys (SX), one with Re &and three Re-free variants. In the case of CMSX-4, experi...Views -
fine equiaxed microstructures in additively manufactured Nickel alloy 718 (4)
According to Hunts steady state model , the CET mainly depends on three factors: the thermal gradient G, the solid/liquid interface velocity V and the number of potent nucleants ahead of the columnar front. Such analysis has been perform...Views -
fine equiaxed microstructures in additively manufactured Nickel alloy 718 (3)
Several aggregates of nearest-neighbour grains having multiple-twin orientation relationships (OR) have been found in the equiaxed zone. Figure 2(a) shows an assembly of grains in twinning orientation relationships, obtained from ...Views -
fine equiaxed microstructures in additively manufactured Nickel alloy 718 (2)
Samples of 150 x 27 x 7 mm3of Nickel alloy 718 alloy were manufactured using a common commercially available Nickel alloy 718 wire for welding applications (1.2 mm diameter). A Precitec CoaxPrinter laser head was used with a continuous l...Views -
fine equiaxed microstructures in additively manufactured Nickel alloy 718 (1)
Nickel alloy 718 is a heat-treatment hardenable alloy that has been used for decades in aeronautical, aerospace andnuclear industries due to its excellent fatigue and corrosion resistance up to 650◦C. Hence, this alloy has been usedearl...Views -
PROPERTIES OF NI BASE SUPERALLOYS
Creep rupture strength It is well indicated in that the creep-rupture-life/ gamma-prime-fraction plots are different for each series of alloys but every series is likely to have a maximum in the vicinity or more than 75 vol%. This means ...Views