Hydrogen embrittlement of the low-carbon steel produced by electron beam additive manufacture | Izvestiya vuzov. Fizika. 2022. № 6. DOI: 10.17223/00213411/65/6/53

Hydrogen embrittlement of the low-carbon steel produced by electron beam additive manufacture

The effect of a cathodic hydrogen charging in different solutions on the mechanical properties and fracture mechanisms of Fe-(1.8-2.1)Mn-(0.7-1.0)Si-(0.05-0.11)C low-carbon steel obtained by electron-beam additive manufacture and industrial casting was studied. Hydrogen charging causes an increase in the yield strength and a decrease in elongation both for steel obtained by additive method (ferritic steel) and for normalized steel produced by industrial method (ferritic-pearlitic steel). An increase in the duration of hydrogen charging from 5 to 20 hours at current density j_H= 250 mA/cm² (aqueous solution NaCl+NH₄SCN) is accompanied by the increase of the hydrogen embrittlement index for additively produced specimens (K_H^5h = 13%, K_H^20h = 19%), but does not affect the K_H-value for normalized industrial steel (K_H^5h = 28%, K_H^20h = 30%). Even at a lower current density and duration of charging, the use of an aqueous solution of sulfuric acid (H₂SO₄+CH₄N₂S) as an electrolytic solution causes greater hydrogen-induced effects than charging in an aqueous solution of sodium chloride. Regardless of the manufacturing method and charging regime, hydrogen charging contributes the formation of fish-eye defects on the fracture surfaces of steels. It was established that under the similar hydrogen charging regimes, the deteriorative effect of hydrogen is less pronounced in steel produced by the additive manufacture.

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Keywords

additive technologies, low-carbon steel, hydrogen embrittlement, fracture

Authors

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

Всего: 6

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