The Effect of CoAl2O4 as a Nucleating Agent and Pouring Temperature on the Microstructure and Properties of Inconel 713C® Nickel-Based Superalloy Castings
Abstract
:1. Introduction
2. Materials and Methods
3. Results
3.1. Analysis of the Solidification Path and Phase Stability in Inconel 713C®
3.2. Macro- and Microstructure of the as-Cast Inconel 713C® Castings
3.3. Mechanical Properties of Inconel 713C® Castings at Room and Elevated Temperature
4. Grain Refinement Mechanism via CoAl2O4 Inoculant Incorporation
5. Conclusions
- Grain size control in lost-wax Inconel 713C® castings can be performed by changing the melt-pouring temperature and CoAl2O4 contents in the prime coating of the shell mold. The most significant grain refinement was achieved in casting H10, where the grain size was reduced from 6.55 mm to 2.36 mm.
- The melt-pouring temperature had a greater influence on the SDAS than the inoculant content. The lowest average SDAS (63 μm) was achieved in the L0 casting, whereas the highest was achieved in the H10 casting (77 μm).
- The size of secondary γ’ in the dendritic regions exhibited a log-normal distribution with increasing melt-pouring temperature, whereas the mean size increased with increasing inoculant contents. The finest mean precipitate size was in casting L0 (0.446 μm), while the coarsest was in casting H10 (0.613 μm).
- Primary and secondary γ’, MC carbides, M3B2 borides, and the intermetallic Ni7Zr2 phase were found in the interdendritic regions of all castings, regardless of the applied melt-pouring temperature or CoAl2O4 concentration.
- Grain refinement influenced the mechanical properties of the Inconel 713C® superalloy at ambient and elevated temperatures. In unmodified variants, the average YS decreased with increasing melt-pouring temperature from 787 MPa (L0–1450 °C) to 775 MPa (H0–1520 °C). Among the CoAl2O4-modified variants, the highest average YS of 835 MPa was achieved in casting L10.
- With increasing inoculant content and, in turn, grain size refinement, the creep resistance tended to be lower, while all samples exceeded the required minimum time to rupture of 30 h (max. 46.1 h for casting M0).
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Casting | Pouring Temperature, °C | Inoculant Content, wt% | Shell Mold Temperature, °C |
---|---|---|---|
L0 | 1450 | 0 | 1150 |
L5 | 5 | ||
L10 | 10 | ||
M0 | 1480 | 0 | |
M5 | 5 | ||
M10 | 10 | ||
H0 | 1520 | 0 | |
H5 | 5 | ||
H10 | 10 |
Pouring Temperature, °C | CoAl2O4, wt% | Grain Size, mm | SDAS, μm |
---|---|---|---|
1450 | 0 | 4.40 (±3.56) | 63 (±7) |
5 | 3.77 (±4.75) | 63 (±5) | |
10 | 2.44 (±2.41) | 66 (±4) | |
1480 | 0 | 3.18 (±3.34) | 69 (±5) |
5 | 2.68 (±2.57) | 69 (±5) | |
10 | 2.40 (±2.07) | 72 (±5) | |
1520 | 0 | 6.55 (±3.73) | 72 (±8) |
5 | 2.45 (±2.62) | 77 (±7) | |
10 | 2.36 (±2.32) | 77 (±6) |
Pouring Temperature, °C | CoAl2O4, wt% | YS, MPa | UTS, MPa |
---|---|---|---|
1450 | 0 | 787 (±21) | 879 (±14) |
5 | 813 (±2) | 1010 (±7) | |
10 | 835 (±6) | 994 (±28) | |
1480 | 0 | 783 (±23) | 877 (±5) |
5 | 828 (±1) | 984 (±6) | |
10 | 814 (±2) | 970 (±21) | |
1520 | 0 | 775 (±8) | 868 (±18) |
5 | 804 (±14) | 947 (±46) | |
10 | 819 (±8) | 967 (±14) |
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Cygan, R.; Rakoczy, Ł. The Effect of CoAl2O4 as a Nucleating Agent and Pouring Temperature on the Microstructure and Properties of Inconel 713C® Nickel-Based Superalloy Castings. Materials 2023, 16, 5588. https://doi.org/10.3390/ma16165588
Cygan R, Rakoczy Ł. The Effect of CoAl2O4 as a Nucleating Agent and Pouring Temperature on the Microstructure and Properties of Inconel 713C® Nickel-Based Superalloy Castings. Materials. 2023; 16(16):5588. https://doi.org/10.3390/ma16165588
Chicago/Turabian StyleCygan, Rafał, and Łukasz Rakoczy. 2023. "The Effect of CoAl2O4 as a Nucleating Agent and Pouring Temperature on the Microstructure and Properties of Inconel 713C® Nickel-Based Superalloy Castings" Materials 16, no. 16: 5588. https://doi.org/10.3390/ma16165588