Enhancing high-temperature oxidation resistance of nickel superalloy obtained by laser powder bed fusion via reactive electric spark treatment

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China Pub Date : 2024-12-01 DOI:10.1016/S1003-6326(24)66649-5

S.K. MUKANOV, M.I. PETRZHIK, A.E. KUDRYASHOV, E.A. NAUMOVA, F.A. BASKOV, P.A. LOGINOV, E.A. LEVASHOV

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Abstract

The high-temperature oxidation resistance of the nickel superalloy prepared by the laser powder bed fusion (LPBF) has been significantly increased as a result of in-situ formation of a thermal barrier layer (α-Al₂O₃ + CaMoO₄) during oxidative annealing of surface layers modified by electric spark treatment (EST). The reactive EST of the LPBF-built items based on nickel EP741NP alloy was carried out with low-melting Al−12%Si, Al−6%Ca−0.6%Si and Al−7%Ca−1%Mn electrodes. It was found that under EST done by Al−7%Ca−1%Mn electrode an intermetallic (β-NiAl + γ’-Ni₃Al) 15 μm-thick layer reinforced by spherical oxide (CaMe)O nanoparticles was formed. Formation of that structure increases the wear resistance of LPBF nickel superalloy by 4.5 times. Further oxidative annealing at 1000 °C leads to a formation of continuous two-layered coating with an inner layer of α-Al₂O₃ and an outer layer of CaMoO₄, which together act as an effective barrier preventing the diffusion of oxygen into the bulk of the superalloy.

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.