The structure and properties of structural medium-carbon steel (chromium-nickel-molybdenum-vanadium), in situ alloyed by tungsten during laser powder bed fusion

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Abstract

The results of a study of the structure and properties of additive medium carbon steel Fe–0.45C–0.4Si–0.7Mn–0.1V–0.3Mo–0.2Cu–1Cr–1.5Ni (in % by weight) alloyed with tungsten in an amount from 1 to 10% by weight are presented. The possibility of tungsten alloying of steel during additive manufacturing was studied. The alloy was carried out when mixing the powders of armored steel and tungsten, then mixture was selective laser melted. It was confirned that during the medium-carbon steel alloying with a different amount of tungsten, both density and hardness change non-linear. The results of the study can be useful for new materials developing and optimizing the laser powder bed fusion.

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About the authors

A. S. Zhukov

NRC "Kurchatov Institute" — CRISM "Prometey"

Author for correspondence.
Email: jouan@mail.ru
Russian Federation, St. Petersburg, 191015

I. V. Shakirov

NRC "Kurchatov Institute" — CRISM "Prometey"

Email: jouan@mail.ru
Russian Federation, St. Petersburg, 191015

V. V. Bobyr’

NRC "Kurchatov Institute" — CRISM "Prometey"

Email: jouan@mail.ru
Russian Federation, St. Petersburg, 191015

M. L. Fedoseev

NRC "Kurchatov Institute" — CRISM "Prometey"

Email: jouan@mail.ru
Russian Federation, St. Petersburg, 191015

N. A. Khristyuk

St. Petersburg State Institute of Technology

Email: nikolai.hristyuk@mail.ru
Russian Federation, St. Petersburg, 190013

S. P. Bogdanov

St. Petersburg State Institute of Technology

Email: nikolai.hristyuk@mail.ru
Russian Federation, St. Petersburg, 190013

P. A. Kuznetsov

NRC "Kurchatov Institute" — CRISM "Prometey"

Email: jouan@mail.ru
Russian Federation, St. Petersburg, 191015

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Supplementary files

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2. Fig. 1. Powders of 45KhN2MFA steel (a) and PVC tungsten (b), accumulations of tungsten in a mixture of powders (c).

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3. Fig. 2. Granulometric composition of a mixture of 45KhN2MFA steel powders and 10 wt.% W.

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4. Fig. 3. Dependences of the density of samples made of 45KhN2MFA steel with the addition of W on energy input.

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5. Fig. 4. Comparison of the dependence of the density of SLS samples made of 45KhN2MFA steel on the W content in the mixture with the calculated density.

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6. Fig. 5. X-ray diffraction patterns of the powder mixture and the SLS sample with 10 wt.% W.

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7. Fig. 6. SEM image of the structure of the SLS sample using the example of a sample with 4% W by weight. Bright areas indicating the presence of tungsten are visible: (a) point clusters, (b) turbulent areas in the melt pool.

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8. Fig. 7. Dependence of hardness on W content.

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9. Fig. 8. SEM image of the structure of the samples with the numbers of the MRSA spectra indicated: (a) sample with W 2 wt.%, (b) with W 4 wt.%.

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