Precipitation behavior and mechanical properties of Inconel 718 alloy prepared by selective laser melting

doi:10.13251/j.issn.0254-6051.2024.03.024

Abstract

Abstract: Inconel 718 alloy was prepared by selective laser melting (SLM), and the as-deposited alloy was double aged (DA) and solution+double aged (SA). The precipitation behavior and tensile properties of the alloy under different heat treatment states were studied by means of scanning electron microscope, electron backscattered diffraction, transmission electron microscopy, and universal testing machine. The results show that aging alone cannot eliminate the Laves phase. After direct aging, the Laves phase still exists in the alloy, but the content of γ' and γ″ strengthened phase is higher than that of the deposited state. The strength of the material significantly increases, and the plasticity significantly decreases. After high-temperature solid solution treatment at 1150 ℃ followed by double aging, the alloy is completely recrystallized, and the substructure disappears. The brittle Laves phase dissolves completely, and the content of the strengthened phases γ' and γ″ phases increases significantly. The strength increases and plasticity decreases compared to the as-deposited specimen. The tensile strength, yield strength and elongation of the alloy reaches 1330 MPa, 1110 MPa and 16.73%, respectively. The solution+double aging process, while enhancing the material's strength, ensures plasticity, which makes the Inconel 718 alloy to have excellent comprehensive mechanical properties.

Key words: Inconel 718 alloy, selective laser melting, heat treatment, precipitated phase, mechanical properties

CLC Number:

TG156.1

Wang Yingzhi, Zheng Liuwei, Yang Fei, Nie Yujin, Meng Lixin, Yin Lei, Liang Wei. Precipitation behavior and mechanical properties of Inconel 718 alloy prepared by selective laser melting[J]. Heat Treatment of Metals, 2024, 49(3): 141-146.

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