Microstructure and Tensile Behavior of a Novel Monocrystalline Co‐Based Superalloy at Different Temperatures

Abstract

Microstructures and tensile properties of a novel monocrystalline Co‐based superalloy are investigated by experiments and finite element simulation. Microstructures of heat‐treated alloys are composed of γ and cubical γ' precipitates without the presence of the secondary phase, and the fraction of γ' phase is about 86%. The experimental results show that tensile properties of the novel monocrystalline Co‐based superalloy have abnormal yield behavior. In low and medium temperature ranges (R.T. 850 °C), the yield stress increases gradually with temperature increase and the tensile fracture surface is characterized by cleavage rupture. At 850 °C, fracture mechanism is composite of cleavage and microporous. While above 850 °C, the yield stress decreases rapidly, and fracture surface is constituted of mixed fracture surface of dimples and micropores. The simulation results show that the tensile stress‐–strain curves are well fitted to the experimental data at different temperatures.

Effect of Segregation on Deformation Behaviour of Nanoscale CoCrCuFeNi High-Entropy Alloy

“…These results demonstrate high reliability and accuracy comparable to the experiment [21,22]. Structure evolution is often studied experimentally using differential scanning calorimetry, a scanning electron microscope, and an electron probe microanalyzer, and these results match well with those predicted based on first-principles calculations [23]. However, the ability of the ab initio method for the deep investigation of crystal lattice properties is usually limited by the size of the computational cell.…”

A Theoretical Model for Predicting the Ultimate Strength of Superalloys in a Wide Temperature Range

“…Inconel 600 [16] 1627 312 616.8 1591.0 0.700 2 Inconel 690 [16] 1616 373 675.0 1503.0 0.480 3 Inconel 718 [15] 1603 298 931.9 2291.0 0.590 4 Inconel 718 [4] 1603 298 1450.0 2291.0 0.590 5 Inconel 625 [5] 1623 298 958.4 1911.6 0.306 6 Inconel 617 [8] 1653 298 805.0 2018.3 0.630 7 Inconel 617 [23] 1653 298 768.5 1925.5 0.630 8 Inconel 750 [42] 1703 296 825.9 1848.0 0.470 9 Inconel 750 [42] 1703 296 1238.9 2252.0 0.239 10 Incoloy 800 H [48] 1658 298 563.1 994.1 0.211 11 Co-30Ni-10Al [49] 1668 296 750.0 2575 0.927 12 Co-16Ni-6.3Al [50] 1671 293 736.6 2299 0.650 includes almost all the superalloys in the Inconel family. The information from the comparison directly is fetched directly and it can be seen that a good agreement between model predictions and experimental data is achieved on the whole.…”

“…[42] superalloy Co-30Ni-10Al. [49] 800 H at room temperature are derived from stress-strain data reported in the study by Bruch et al [43] . The melting point temperatures of Co-30Ni-10Al [44] and Co-16Ni-6.3Al [45] were adopted from the reported melting point data for alloys with similar compositions to their compositions.…”