Effect of Al on Microstructure and Tensile Behavior of an Additive Manufacturing Nickel-Based Superalloy

doi:10.12068/j.issn.1005-3026.2023.03.006

Abstract

Abstract: To clarify the effect of Al on the microstructure and properties of nickel base superalloy produced by additive manufacturing， the effects of Al on the microstructure， tensile properties and deformation mechanism were analyzed via the Ni based superalloys with different Al contents prepared by laser metal deposition. The experimental results show that with the improvement of Al content(3% to 5%)， the γ/γ′ eutectic， carbides and cracks in microstructure increase a few. When the Al content reaches 7%， the quantity of γ/γ′ eutectic and carbides increase prominently. A large number of solidification cracks and liquefaction cracks， which are formed due to the pinning of high melting point carbides at grain boundaries and the remelting of low melting point eutectic， respectively， can be observed. The strength of the alloy increases first and then decreases with the increase of Al element， and the alloy with 4% Al has the highest strength. It is due to the increasing size and cubic of γ′phase that hinders the movement of dislocations effectively. The decrease of strength and plasticity of the alloy with 5% Al is attributed to the increase of existed hot cracks， carbides and eutectic.

Key words: additive manufacturing; nickel-based superalloy; hot cracks; tensile behavior; Al element

CLC Number:

TG132.3

ZHU Yu， SONG Wei， LIANG Jing-jing， LI Jin-guo. Effect of Al on Microstructure and Tensile Behavior of an Additive Manufacturing Nickel-Based Superalloy[J]. Journal of Northeastern University(Natural Science), 2023, 44(3): 348-356.

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