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<p>The effects of heat treatment on microstructure evolution and high-temperature tensile properties of FGH96 joints prepared by inertia friction welding (IFW) were investigated. The weld center consists of small uniform and equiaxed complete dynamic recrystallization with a grain size of 4.6 ± 0.3&#xa0;μm. The complete dissolution of the secondary γ′ phase in the WCZ is the reason for the lowest hardness. With increasing distance from the WCZ, the volume fraction of γ′ phase increases continuously within the range of 1&#xa0;mm and basically remains unchanged after 1.5&#xa0;mm, and the shape gradually changes from spherical to cubic. After heat treatment, the variations in the volume fraction and shape transformation of the secondary γ′ phase were similar to those of the As-weld. Especially, the tertiary γ′ phase was obviously precipitated and dispersed in the interior and boundaries of grains. The tensile properties were measured at 650 ℃. The as-weld sample showed outstanding strength (<i>σ</i><sub>y</sub> 1001 ± 2&#xa0;MPa, <i>σ</i><sub>uts</sub> 1151 ± 2&#xa0;MPa), but poor ductility (<i>ε</i><sub>f</sub> 2.0 ± 0.2%). After heat treatment, the <i>σ</i><sub>y</sub> and <i>σ</i><sub>uts</sub> gradually increase to 1109 ± 1&#xa0;MPa and 1427 ± 13&#xa0;MPa, respectively. And the <i>ε</i><sub>f</sub> increases to 5.6 ± 0.5%. The higher strength may be attributed to the strengthening effect of tertiary γ′.</p>

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Effect of heat treatment on the microstructure and high-temperature tensile properties of FGH96 joints prepared by inertia friction welding

  • 期刊论文

  • 发表日期：

    2025年8月16日

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  • Wu Liang,
  • Chunbo Zhang,
  • Yanquan Wu,
  • Jun Zhou,
  • Feng Qin,
  • Mingqiang Yuan,
  • Yunlei Li,
  • Youzhao Zhang,
  • Xiangwei Li

摘要

The effects of heat treatment on microstructure evolution and high-temperature tensile properties of FGH96 joints prepared by inertia friction welding (IFW) were investigated. The weld center consists of small uniform and equiaxed complete dynamic recrystallization with a grain size of 4.6 ± 0.3 μm. The complete dissolution of the secondary γ′ phase in the WCZ is the reason for the lowest hardness. With increasing distance from the WCZ, the volume fraction of γ′ phase increases continuously within the range of 1 mm and basically remains unchanged after 1.5 mm, and the shape gradually changes from spherical to cubic. After heat treatment, the variations in the volume fraction and shape transformation of the secondary γ′ phase were similar to those of the As-weld. Especially, the tertiary γ′ phase was obviously precipitated and dispersed in the interior and boundaries of grains. The tensile properties were measured at 650 ℃. The as-weld sample showed outstanding strength (σy 1001 ± 2 MPa, σuts 1151 ± 2 MPa), but poor ductility (εf 2.0 ± 0.2%). After heat treatment, the σy and σuts gradually increase to 1109 ± 1 MPa and 1427 ± 13 MPa, respectively. And the εf increases to 5.6 ± 0.5%. The higher strength may be attributed to the strengthening effect of tertiary γ′.