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<p>Superalloy FGH4096 powder produced using a plasma rotation electrode process was consolidated by hot oscillating pressing (HOP) at different temperatures (1150&#xa0;°C, 1180&#xa0;°C, and 1210&#xa0;°C). The variations in the microstructural characteristics and tensile behavior with the HOP temperature were investigated using optical microscopy, scanning electron microscopy, electron probe micro-analysis, electron backscatter diffraction, and room-temperature tensile tests. The results showed that the prior particle boundary (PPB) precipitates were the primary γ′ phase, carbide, and boride. The HOP temperature had a notable effect on the PPB precipitates, grain size, and tensile properties. With an increase in the HOP temperature, the continuity of the PPB precipitates decreased and the grain size increased. Therefore, the tensile fracture mode changed from inter-particle fracture to trans-particle (intergranular or transgranular) fracture. In addition, the sample yield strength gradually decreased and the stability of the tensile property gradually improved. The tensile property first increased and then decreased as the HOP temperature increased from 1150&#xa0;°C to 1180&#xa0;°C and 1210&#xa0;°C. The highest tensile strength and tensile elongation values of 1273&#xa0;MPa and 27.8%, respectively, were obtained when the HOP temperature was 1180&#xa0;°C, which were much higher than those of samples prepared by hot pressing and hot isostatic pressing.</p>

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Microstructure Evolution and Tensile Behavior of Hot Oscillating Pressed Nickel-Based Powder Metallurgy Superalloy

  • 期刊论文

  • 发表日期：

    2025年2月20日

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  • Dejian Sun,
  • Mengwei Yang,
  • Yuyang Yuan,
  • Peng He,
  • Yang Gao,
  • Songqin Xia,
  • Fulin Li,
  • Lei Fan,
  • Xiaoqin Guo

摘要

Superalloy FGH4096 powder produced using a plasma rotation electrode process was consolidated by hot oscillating pressing (HOP) at different temperatures (1150 °C, 1180 °C, and 1210 °C). The variations in the microstructural characteristics and tensile behavior with the HOP temperature were investigated using optical microscopy, scanning electron microscopy, electron probe micro-analysis, electron backscatter diffraction, and room-temperature tensile tests. The results showed that the prior particle boundary (PPB) precipitates were the primary γ′ phase, carbide, and boride. The HOP temperature had a notable effect on the PPB precipitates, grain size, and tensile properties. With an increase in the HOP temperature, the continuity of the PPB precipitates decreased and the grain size increased. Therefore, the tensile fracture mode changed from inter-particle fracture to trans-particle (intergranular or transgranular) fracture. In addition, the sample yield strength gradually decreased and the stability of the tensile property gradually improved. The tensile property first increased and then decreased as the HOP temperature increased from 1150 °C to 1180 °C and 1210 °C. The highest tensile strength and tensile elongation values of 1273 MPa and 27.8%, respectively, were obtained when the HOP temperature was 1180 °C, which were much higher than those of samples prepared by hot pressing and hot isostatic pressing.