Effect of direct aging treatment on microstructure and properties of hammering composite laser deposited GH4169 superalloy

doi:10.13251/j.issn.0254-6051.2024.10.013

Abstract

Abstract: Direct aging treatment of GH4169 superalloy obtained through hammering directed energy deposition (HDED) process was carried out. The results show that the microstructure of the specimen after HDED process is characterized by alternating distribution of equiaxed and columnar grains, and the content of Laves phase is reduced. The redissolution of the Laves phase promotes the precipitation of the γ″ phase and δ phase during direct aging process, while the small equiaxed grains and the work hardening effect of the specimen are retained after direct aging treatment. The small equiaxed grains produce fine grain strengthening effect, and the precipitation of the γ″ phase provides precipitation strengthening effect, by which the mechanical properties of the specimens are significantly improved after direct aging treatment, where the hardness is increased to 457.1 HV0.2, and the transverse and longitudinal tensile strengths are increased to 1205 and 1140 MPa, respectively.

Key words: HDED, GH4169 alloy, direct aging treatment, mechanical properties, microstructure

CLC Number:

TG166.7

Wei Wenyi. Effect of direct aging treatment on microstructure and properties of hammering composite laser deposited GH4169 superalloy[J]. Heat Treatment of Metals, 2024, 49(10): 85-91.

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