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Effects of P on microstructures and properties of directionally solidified superalloy DZ125
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Jinxia SONG1, Chihang JIANG2, Yongwang KANG1, Chengbo XIAO1, *, Liwu JIANG2, Ming LI1, Shenglong DAI1
Journal of Aeronautical Materials | 2025, 45(5) : 142 - 149
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Journal of Aeronautical Materials | 2025, 45(5): 142-149
• Research Paper •
Effects of P on microstructures and properties of directionally solidified superalloy DZ125
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Jinxia SONG1, Chihang JIANG2, Yongwang KANG1, Chengbo XIAO1, *, Liwu JIANG2, Ming LI1, Shenglong DAI1
Affiliations
  • 1Science and Technology on Advanced High Temperature Structural Materials Laboratory，AECC Beijing Institute of Aeronautical Materials，Beijing 100095，China
  • 2National Center for Materials Service Safety，University of Science and Technology Beijing，Beijing 100083，China
Published: 2025-10-01 doi: 10.11868/j.issn.1005-5053.2025.000116
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The directionally solidified superalloy DZ125 is widely used as turbine blades in aero-engines. This work investigates the influence of phosphorus（P）on the microstructure, mechanical properties and crack susceptibility of DZ125 alloy. The results indicate that P primarily segregates at grain boundaries in DZ125 alloy and has little effect on γ′ phases, γ+γ′ eutectic and carbides in the alloy. When P content reaches 0.008% （mass fraction, the same below） P-rich phases form in the interdendritic regions during casting, which subsequently dissolve back into the matrix during heat treatment.When the P content is no more than 0.0039%, P shows no obvious effects on the room-temperature tensile properties or the stress rupture life at 980℃/235 MPa. However, it has a significant impact on the stress rupture life at 760℃/805 MPa: the alloy with 0.0039% P exhibits a 37% decrease in stress rupture life at 760℃/805 MPa compared to the alloy with 0.0013% P, due to the segregation of P at grain boundaries weakens the grain boundaries. When the P content reaches 0.011%, the intergranular cracks appear in the DZ125 alloy hollow turbine blades during directionally solidified process. The main reason for the increase of crack susceptibility is excessive enrichment of P at grain boundaries and precipitation of P-rich phases nearby grain boundaries, which leads to grain boundary weakening and crack initiation.

P element  /  DZ125 alloy  /  microstructure  /  mechanical property  /  crack susceptibility
Jinxia SONG, Chihang JIANG, Yongwang KANG, Chengbo XIAO, Liwu JIANG, Ming LI, Shenglong DAI. Effects of P on microstructures and properties of directionally solidified superalloy DZ125[J]. Journal of Aeronautical Materials, 2025 , 45 (5) : 142 -149 . DOI: 10.11868/j.issn.1005-5053.2025.000116
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Article Info
doi: 10.11868/j.issn.1005-5053.2025.000116
  • Receive Date：2025-06-27
  • Online Date：2026-04-09
  • Published：2025-10-01
Article Data
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  • Received：2025-06-27
  • Accepted：2025-09-02
Affiliations
    1Science and Technology on Advanced High Temperature Structural Materials Laboratory，AECC Beijing Institute of Aeronautical Materials，Beijing 100095，China
    2National Center for Materials Service Safety，University of Science and Technology Beijing，Beijing 100083，China
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表12种不同金属材料的力学参数
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Number of
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小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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