Microstructure and phase composition of the gradient material “stainless steel/Cr-Ni alloy” produced by electron-beam additive manufacture | Izvestiya vuzov. Fizika. 2022. № 5. DOI: 10.17223/00213411/65/5/9

Microstructure and phase composition of the gradient material “stainless steel/Cr-Ni alloy” produced by electron-beam additive manufacture

Using the methods of scanning and transmission electron microscopy, the microstructure of the gradient material "steel Fe-18Cr-10Ni-Ti-0.08C/80Ni-20Cr alloy" (mass.%) produced by the double-wire electron-beam additive manufacture was studied. The chemical composition of the material continuously changes from one corresponded to the Fe-18Cr-10Ni-Ti-0.08C stainless steel to that of 80Ni-20Cr alloy with the intermediate gradient layer formed by deposition of two wires in different ratios. The microstructure of the part of the samples, which corresponds to pure steel without the addition of a nichrome alloy, is characterized by large columnar austenitic grains (γ-phase) with a small fraction of dendritic δ-ferrite (about 20%). The addition of NiCr alloy suppresses the formation of the δ-phase during the additive growth of the steel, thus, the main part of the gradient sample has an austenitic coarse-grained structure. In the part of the material, which contain high fraction of nichrome alloy, particles of intermetallic phases are formed. Stabilization of austenitic structure of stainless steel with the addition of NiCr alloy is discussed from the point of view of changing the chromium-nickel equivalent and the mechanism of crystallization in the melting pool during additive manufacture.

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Keywords

ferrite, microstructure, austenite, stainless steel, additive technologies

Authors

Name	Organization	E-mail
Reunova K.A.	Institute of Strength Physics and Materials Science SB RAS	reunova.ksenya@mail.ru
Astafurova E.G.	Institute of Strength Physics and Materials Science SB RAS	elena.g.astafurova@ispms.ru
Moskvina V.A.	Institute of Strength Physics and Materials Science SB RAS	valya_moskvina@mail.ru
Astafurov S.V.	Institute of Strength Physics and Materials Science SB RAS	svastafurov@gmail.com
Panchenko M.Yu.	Institute of Strength Physics and Materials Science SB RAS	panchenko.marina4@gmail.com
Melnikov E.V.	Institute of Strength Physics and Materials Science SB RAS	melnickow.jenya@yandex.ru
Kolubaev E.A.	Institute of Strength Physics and Materials Science SB RAS	eak@ispms.tsc.ru

Всего: 7

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