WANG GuangLei, duan ran, huang shuo, qu jinglong, du jinhui, zhao guangpu. Effect of cooling method after solution treatment on heat-treated microstructure and mechanical properties of a novel hard-deform nickel-base superalloy[J]. MW Metal Forming.
Citation: WANG GuangLei, duan ran, huang shuo, qu jinglong, du jinhui, zhao guangpu. Effect of cooling method after solution treatment on heat-treated microstructure and mechanical properties of a novel hard-deform nickel-base superalloy[J]. MW Metal Forming.

Effect of cooling method after solution treatment on heat-treated microstructure and mechanical properties of a novel hard-deform nickel-base superalloy

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  • Received Date: September 22, 2024
  • Revised Date: October 21, 2024
  • Accepted Date: October 27, 2024
  • Available Online: November 03, 2024
  • It is investigated that the effect of solid-solution cooling methods on the heat-treated microstructure and resultant mechanical properties of a novel Ni-based wrought superalloy with a high content of (~55 wt.%) of γʹ phase. The obtained microstructure after sub-solvus static recrystallization is uniform and fine with 10~30 μm. The solid-solution cooling method has a significant impact on the recrystallized grain boundary and the distribution and size of γʹ precipitates. As the solid-solution cooling rate decreases (water cooling > oil cooling > air cooling), the sizes of primary and secondary γʹ precipitates increase, while the number of tertiary γʹ precipitates decreases. The tensile strengths at room temperature and 850 ℃ are closely related to the distribution of γʹ precipitates, and the smaller the size of secondary γʹ precipitates, the higher the tensile strength. Both the tensile plasticity at 850 ℃ and the stress-rupture property under 850 ℃/350 MPa are largely determined by the recrystallized grain boundary (and the grain size). The quasi-cleavage and plastic mixed fracture can be obtained with the presence of coarsened primary γʹ precipitates and carbides on recrystallized grain boundaries at 850 ℃.

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