| METALS AND METAL MATRIX COMPOSITES |
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| Influence of Phosphorus on Hot Deformation of IN718 Alloy |
| LYU Wenlong1,2, JIA Dan1,2,*, ZHANG Anwen3, LI Shaowei1,2, ZHAO Shuwei4, XIN Xin1,2, LIU Enze1,2
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1 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China; 2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China; 3 Wuxi Huatian Gas Turbine Co.,Ltd., Wuxi 214000, Jiangsu, China; 4 School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China |
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Abstract The hot deformation behaviors of two kinds of IN718 alloys with varying P contents were studied by tensile tests under the deformation tempe-rature range of 920—1 000 ℃ and strain rate range of 5×10-4—10-2 s-1. The effects of P on microstructure evolution and dynamic recrystallization behaviors were characterized by means of SEM, EBSD and TEM. The results indicate that the addition of P significantly alters both the quantity and morphology of δ-phase during hot deformation, thereby affecting dynamic recrystallization. At deformation temperatures within the δ-phase precipitation range, the addition of P reduces the amount of δ-phase and suppresses its growth, which promotes the nucleation of dynamically recrystallized grains. However, when the deformation temperature increases to the level where δ-phase precipitation no longer occurs, P tends to segregate at grain boundaries. Therefore, the segregation of P atoms could inhibit grain boundary migration through solid-solution dragging effects, thereby obstructing the nucleation and growth of dynamically recrystallized grains and consequently reducing the dynamic recrystallization fraction.
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Published: 10 March 2026
Online: 2026-03-10
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