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Enhancing high-temperature oxidation resistance(at 1000 °C) of nickel superalloy obtained by laser powder bed fusion via reactive electric spark treatment

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Transactions of Nonferrous metals Society of China 2024年

作者： S.K.mUKANOV m.i.petrzhik A.E.KUDRYASHOV E.A.NAUmOVA F.A.BASKOV P.A.LOGiNOV E.A.LEVASHOV National University of Science and Technology miSiS

The high-temperature oxidation resistance of the nickel superalloy grown 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 at EST done by Al-7%Ca-1%mn electrode an intermetallic (β-NiAl + γ’-Ni3Al) 15 microns 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 lead to a formation of continuous two-layered coating with an inner layer of α-Al2O3and an outer layer of CamoO4， which together act as an effective barrier preventing the diffusion of oxygen into the volume of the superalloy.

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Amorphous-crystalline transition layers formation during quenching of Fe_(61)Co_7Zr_(10)mo_5W_2B_(15) melt

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中国有色金属学会会刊：英文版 2003年第1期13卷 10-13页

作者：高玉来孙剑飞沈军王刚 m.i.petrzhik 周彼德 School of materials Science and Engineering Harbin Institute of Technology Harbin 150001 China A.A. Baikov institute of metallurgy and materials Science Russian Academy of Sciences Moscow 117911 Russia

New Fe-based multicomponent amorphous alloys have been developed recently based on empirical rules for large glass forming ability(GFA). in the present investigation, the master alloy ingot with the nominal composition of Fe 61Co 7Zr 10mo 5W 2B 15(mole fraction, %) was prepared by arc-melting under Ti-gettered Ar atmosphere. The Fe-based buttons with different transverse cross sections were fabricated by arc-melting method, and the d 2.5 mm Fe-based rods were manufactured by injection technique. Characterization of the ingots and the parameters associated with the thermal stability were carried out by X-ray diffractometry(XRD) and high temperature differential scanning calorimeter(DSC), respectively. The interval of the supercooled liquid region is 39 K for the Fe-based alloy. The GFA of Fe-based alloys is relatively lower, to the buttons obtained are all crystallized. The Fe-based rod exhibites a high Vickers hardness up to HV 1 329. in addition, an amorphous-crystalline transition layers are observed in the rod. This transition zone is caused by unhomogeneous temperature distribution and relatively lower GFA for Fe-based alloys.

关键词：铁基合金玻璃态合金金属玻璃玻璃成形性能淬火结晶化

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