Microstructure and Properties of JG4247 Alloy with Different Casting Process AITranslate
Abstract AITranslate
The grain structure and dendrite morphology have a significant influence on the mechanical properties of cast Ni-based superalloys. The morphology，size，and distribution of γ' precipitates are also key factors that determine the mechanical properties. The regulation and control of microstructure can be achieved by adjusting the casting process parameters，including the pouring temperature，shell temperature，and cooling rate. The viscosity of the melt decreases with increasing pouring temperature，which enhances the filling ability of the melt. Fine dendrite structures and uniformly distributed precipitates can be easily obtained when the shell temperature is low，which improves the strength，toughness，and fatigue performance of the castings. An increase in cooling rate can significantly refine the dendrites，carbides，borides，and eutectic γ-γ' phase. In addition，solute redistribution occurs during solidification due to its multi-component and non-equilibrium nature of the solidification process. Different casting processes will inevitably alter the distribution of solutes in the solid-liquid phase during the solidification process，thereby affecting the microstructure and properties of the alloy. In this study，a novel Ni-based superalloy JG4247 with high B content was investigated. The test alloy was prepared using vacuum induction melting （VIM）. Three variables including pouring temperature，shell temperature，and cooling rate，were set in the pouring test. The pouring temperature was 1430 and 1460 ℃. The shell temperature was 850，950，and 1050 ℃，and the cooling rate was 8，17，and 27 ℃·min−1. Samples from different states of the casting rods were cut by wire-cutting for the observation of the grain morphologies and microstructure by optical microscope （OM）and scanning electron microscope （SEM）. The effects of casting parameters on the grain size，dendrite spacing，the morphology of γ' phase，and the size of the eutectic γ-γ' phase were investigated. The relationship between the casting parameters and the microstructure of JG4247 alloy was established. The high-temperature tensile properties and stress-rupture properties of the alloy under different casting conditions were tested at 800 ℃ and 800 ℃/580 MPa，respectively. The results indicated that the size of grains and eutectic γ-γ' phases increased with the increasing pouring temperature and shell temperature，but decreased with higher cooling rate. The volume fraction of eutectic γ-γ' phases increased with the increase of pouring temperature and cooling rate，showed a trend of increasing and then decreasing with the increase of shell temperature，had a peak value when the mold shell temperature was 950 ℃. The volume fraction of borides and dendrite γ' phases increased with the increase of pouring temperature，showed a trend of first increasing and then decreasing with the increase of shell temperature，and decreased with the increase of cooling rate. The evolution of microstructures under different casting parameters was accompanied by significant changes in mechanical properties. The high-temperature mechanical properties of JG4247 alloy at 800 ℃ increased with the increase in pouring temperature and showed a trend of first increasing and then decreasing with the increase of shell temperature. The volume fraction of eutectic γ-γ' phases and the borides were the highest at 950 ℃. JG4247 alloy had the best tensile and stress-rupture properties at 950 ℃. The effect of cooling rate on microstructure was mainly reflected in the eutectic γ-γ' phase and dendriteγ' phase. When the cooling rate was 17 ℃·min−1，the grain size and the volume fraction of eutectic γ-γ' phase and dendritic γ' phase reached a reasonable level，thus JG4247 alloy had the longest stress-rupture life. By summarizing the effect of casting parameters on the microstructure and properties of the JG4247 alloy，the optimum casting parameters were determined to be：pouring temperature was 1460 ℃，shell temperature was 950 ℃，and cooling rate was 17 ℃·min−1. Under these conditions，the volume fraction of eutectic γ-γ' phase and dendritic γ' phase was the highest，the dendritic γ' phase possessed irregular petal-shaped morphology，which made the alloy had the best high-temperature mechanical properties. The study provided significant data for controlling the solidified microstructure of JG4247 alloy.
KeyWords AITranslate
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Basic Information:
DOI：10.13373/j.cnki.cjrm.XY23090012
Chinese Library Classification Number:TG444
Citation Information:
The grain structure and dendrite morphology have a significant influence on the mechanical properties of cast Ni-based superalloys. The morphology，size，and distribution of γ' precipitates are also key factors that determine the mechanical properties. The regulation and control of microstructure can be achieved by adjusting the casting process parameters，including the pouring temperature，shell temperature，and cooling rate. The viscosity of the melt decreases with increasing pouring temperature，which enhances the filling ability of the melt. Fine dendrite structures and uniformly distributed precipitates can be easily obtained when the shell temperature is low，which improves the strength，toughness，and fatigue performance of the castings. An increase in cooling rate can significantly refine the dendrites，carbides，borides，and eutectic γ-γ' phase. In addition，solute redistribution occurs during solidification due to its multi-component and non-equilibrium nature of the solidification process. Different casting processes will inevitably alter the distribution of solutes in the solid-liquid phase during the solidification process，thereby affecting the microstructure and properties of the alloy. In this study，a novel Ni-based superalloy JG4247 with high B content was investigated. The test alloy was prepared using vacuum induction melting （VIM）. Three variables including pouring temperature，shell temperature，and cooling rate，were set in the pouring test. The pouring temperature was 1430 and 1460 ℃. The shell temperature was 850，950，and 1050 ℃，and the cooling rate was 8，17，and 27 ℃·min−1. Samples from different states of the casting rods were cut by wire-cutting for the observation of the grain morphologies and microstructure by optical microscope （OM）and scanning electron microscope （SEM）. The effects of casting parameters on the grain size，dendrite spacing，the morphology of γ' phase，and the size of the eutectic γ-γ' phase were investigated. The relationship between the casting parameters and the microstructure of JG4247 alloy was established. The high-temperature tensile properties and stress-rupture properties of the alloy under different casting conditions were tested at 800 ℃ and 800 ℃/580 MPa，respectively. The results indicated that the size of grains and eutectic γ-γ' phases increased with the increasing pouring temperature and shell temperature，but decreased with higher cooling rate. The volume fraction of eutectic γ-γ' phases increased with the increase of pouring temperature and cooling rate，showed a trend of increasing and then decreasing with the increase of shell temperature，had a peak value when the mold shell temperature was 950 ℃. The volume fraction of borides and dendrite γ' phases increased with the increase of pouring temperature，showed a trend of first increasing and then decreasing with the increase of shell temperature，and decreased with the increase of cooling rate. The evolution of microstructures under different casting parameters was accompanied by significant changes in mechanical properties. The high-temperature mechanical properties of JG4247 alloy at 800 ℃ increased with the increase in pouring temperature and showed a trend of first increasing and then decreasing with the increase of shell temperature. The volume fraction of eutectic γ-γ' phases and the borides were the highest at 950 ℃. JG4247 alloy had the best tensile and stress-rupture properties at 950 ℃. The effect of cooling rate on microstructure was mainly reflected in the eutectic γ-γ' phase and dendriteγ' phase. When the cooling rate was 17 ℃·min−1，the grain size and the volume fraction of eutectic γ-γ' phase and dendritic γ' phase reached a reasonable level，thus JG4247 alloy had the longest stress-rupture life. By summarizing the effect of casting parameters on the microstructure and properties of the JG4247 alloy，the optimum casting parameters were determined to be：pouring temperature was 1460 ℃，shell temperature was 950 ℃，and cooling rate was 17 ℃·min−1. Under these conditions，the volume fraction of eutectic γ-γ' phase and dendritic γ' phase was the highest，the dendritic γ' phase possessed irregular petal-shaped morphology，which made the alloy had the best high-temperature mechanical properties. The study provided significant data for controlling the solidified microstructure of JG4247 alloy.
quote
| GB/T 7714-2015 | [1] Yuefeng Cui, Shaoli Han, Shangping Li, et al. Microstructure and Properties of JG4247 Alloy with Different Casting Process[J]. Chinese Journal of Rare Metals, 2025, 49(6): 962-970. DOI:10.13373/j.cnki.cjrm.XY23090012. |
| MLA | [1] Yuefeng Cui, et al., "Microstructure and Properties of JG4247 Alloy with Different Casting Process." Chinese Journal of Rare Metals, vol. 49, no. 6, 2025, pp. 962-970, https://doi.org/10.13373/j.cnki.cjrm.XY23090012. |
| APA | [1] Yuefeng Cui, Shaoli Han, Shangping Li, Jie Hou, & Chen Ling. (2025). Microstructure and Properties of JG4247 Alloy with Different Casting Process. Chinese Journal of Rare Metals, 49(6), 962-970. https://doi.org/10.13373/j.cnki.cjrm.XY23090012 |
| IEEE | [1] Yuefeng Cui, Shaoli Han, Shangping Li, Jie Hou, and Chen Ling, "Microstructure and Properties of JG4247 Alloy with Different Casting Process," Chinese Journal of Rare Metals, vol. 49, no. 6, pp. 962-970, 2025, doi: 10.13373/j.cnki.cjrm.XY23090012. keywords: {casting process;microstructure;high-temperature mechanical property;JG4247 alloy} |