This experimental work analyzes the hydrogen embrittlement mechanism in quenched and tempered low-alloyed steels. Experimental tests were performed to study hydrogen diffusion under applied cyclic loading. The permeation curves were fitted by considering literature models in order to evaluate the role of trapping-both reversible and irreversible-on the diffusion mechanism. Under loading conditions, a marked shift to the right of the permeation curves was noticed mainly at values exceeding the tensile yield stress. In the presence of a relevant plastic strain, the curve changes due to the presence of irreversible traps, which efficiently subtract diffusible atomic hydrogen. A significant reduction in the apparent diffusion coefficient and a considerable increase in the number of traps were noticed as the maximum load exceeded the yield strength. Cyclic loading at a tensile stress slightly higher than the yield strength of the material increases the hydrogen entrapment phenomena. The tensile stress causes a marked and instant reduction in the concentration of mobile hydrogen within the metal lattice from 55% of the yield strength, and it increases significantly in the plastic field.

(2020). Hydrogen Permeation in X65 Steel under Cyclic Loading [journal article - articolo]. In MATERIALS. Retrieved from http://hdl.handle.net/10446/160962

Hydrogen Permeation in X65 Steel under Cyclic Loading

Cabrini, Marina;Coppola, Luigi;Lorenzi, Sergio;Testa, Cristian;Carugo, Francesco;Bucella, Diego Pesenti;Pastore, Tommaso
2020-01-01

Abstract

This experimental work analyzes the hydrogen embrittlement mechanism in quenched and tempered low-alloyed steels. Experimental tests were performed to study hydrogen diffusion under applied cyclic loading. The permeation curves were fitted by considering literature models in order to evaluate the role of trapping-both reversible and irreversible-on the diffusion mechanism. Under loading conditions, a marked shift to the right of the permeation curves was noticed mainly at values exceeding the tensile yield stress. In the presence of a relevant plastic strain, the curve changes due to the presence of irreversible traps, which efficiently subtract diffusible atomic hydrogen. A significant reduction in the apparent diffusion coefficient and a considerable increase in the number of traps were noticed as the maximum load exceeded the yield strength. Cyclic loading at a tensile stress slightly higher than the yield strength of the material increases the hydrogen entrapment phenomena. The tensile stress causes a marked and instant reduction in the concentration of mobile hydrogen within the metal lattice from 55% of the yield strength, and it increases significantly in the plastic field.
articolo
2020
Cabrini, Marina; Coppola, Luigi; Lorenzi, Sergio; Testa, Cristian; Carugo, Francesco; PESENTI BUCELLA, Diego; Pastore, Tommaso
(2020). Hydrogen Permeation in X65 Steel under Cyclic Loading [journal article - articolo]. In MATERIALS. Retrieved from http://hdl.handle.net/10446/160962
File allegato/i alla scheda:
File Dimensione del file Formato  
materials-13-02309.pdf

accesso aperto

Versione: publisher's version - versione editoriale
Licenza: Creative commons
Dimensione del file 2.89 MB
Formato Adobe PDF
2.89 MB Adobe PDF Visualizza/Apri
Pubblicazioni consigliate

Aisberg ©2008 Servizi bibliotecari, Università degli studi di Bergamo | Terms of use/Condizioni di utilizzo

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10446/160962
Citazioni
  • Scopus 9
  • ???jsp.display-item.citation.isi??? 9
social impact