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<p>The GH4720Li superalloy, valued for its oxidation resistance and high-temperature strength in aerospace applications like turbine disks, has an extremely narrow thermal processing window that complicates precise control over heat treatment parameters. This study investigates the high-temperature tensile properties and endurance performance of the alloy with short-term solution holding times and analyzes the strengthening mechanism induced by plastic deformation. During high-temperature tensile and endurance performance, the yield strength and Rupture Life initially increases and subsequently decreases. With the extension of solid solution time, the primary <i>γ</i>’ phase progressively dissolves, while the secondary <i>γ</i>’ phase gradually precipitates. Consequently, the pinning effect of the primary <i>γ</i>’ phase on the grain boundaries diminishes. The Orowan bypass mechanism plays a major role in the early stage of plastic deformation. At a solution treatment time of 30&#xa0;mins, the yield strength reaches its maximum, the size of the secondary <i>γ</i>’ phase is the largest, and the critical shear stress is smallest. Twins formed by grain boundary migration contribute significantly to grain boundary strengthening. Under the combined action of various strengthening mechanisms, the alloy's yield strength and rupture life exhibit a non-monotonic trend, initially increasing before decreasing, and demonstrate a synergistic effect during plastic deformation.</p>

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Effect of Short-Term Solution Treatment on Plastic Deformation Mechanism of GH4720Li Superalloy

  • 期刊论文

  • 发表日期：

    2025年11月5日

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  • Xie Yuchang,
  • Dong Ruifeng,
  • Zhou Xing,
  • Yang Bo,
  • Qu Jinglong,
  • Shi Yuting,
  • Ma Tianjun

摘要

The GH4720Li superalloy, valued for its oxidation resistance and high-temperature strength in aerospace applications like turbine disks, has an extremely narrow thermal processing window that complicates precise control over heat treatment parameters. This study investigates the high-temperature tensile properties and endurance performance of the alloy with short-term solution holding times and analyzes the strengthening mechanism induced by plastic deformation. During high-temperature tensile and endurance performance, the yield strength and Rupture Life initially increases and subsequently decreases. With the extension of solid solution time, the primary γ’ phase progressively dissolves, while the secondary γ’ phase gradually precipitates. Consequently, the pinning effect of the primary γ’ phase on the grain boundaries diminishes. The Orowan bypass mechanism plays a major role in the early stage of plastic deformation. At a solution treatment time of 30 mins, the yield strength reaches its maximum, the size of the secondary γ’ phase is the largest, and the critical shear stress is smallest. Twins formed by grain boundary migration contribute significantly to grain boundary strengthening. Under the combined action of various strengthening mechanisms, the alloy's yield strength and rupture life exhibit a non-monotonic trend, initially increasing before decreasing, and demonstrate a synergistic effect during plastic deformation.