Next Article in Journal
Study on Mix Proportion Optimization of Manufactured Sand RPC and Design Method of Steel Fiber Content under Different Curing Methods
Next Article in Special Issue
Laboratory-Based Investigation into Stress Corrosion Cracking of Cable Bolts
Previous Article in Journal
Half-Metallic Property Induced by Double Exchange Interaction in the Double Perovskite Bi2BB′O6 (B, B′ = 3d Transitional Metal) via First-Principles Calculations
Open AccessArticle

Hydrogen Embrittlement Evaluation of Micro Alloyed Steels by Means of J-Integral Curve

1
Department of Engineering and Applied Sciences, University of Bergamo, 24044 Dalmine (BG), Italy
2
INSTM Unità di Ricerca Bergamo, 24044 Dalmine (BG), Italy
3
CSGI Unità di Ricerca Bergamo, 24044 Dalmine (BG), Italy
4
Transitgas AG Zurich (Ch), 8001 Zurich, Switzerland
5
Eni S.p.A TECM, 20097 San Donato Milanese (MI), Italy
6
Snam S.p.A. DIREZIONE TECNICA, 20097 San Donato Milanese (MI), Italy
7
Dipartimenti di Chimica, Materiali e Ingegneria Chimica G. Natta Politecnico di Milano, 20131 Milano (MI), Italy
*
Author to whom correspondence should be addressed.
Materials 2019, 12(11), 1843; https://doi.org/10.3390/ma12111843
Received: 9 May 2019 / Revised: 27 May 2019 / Accepted: 31 May 2019 / Published: 6 June 2019
(This article belongs to the Special Issue Stress-Corrosion Cracking in Materials)
The aim of this work is the evaluation of the hydrogen effect on the J-integral parameter. It is well-known that the micro alloyed steels are affected by Hydrogen Embrittlement phenomena only when they are subjected at the same time to plastic deformation and hydrogen evolution at their surface. Previous works have pointed out the absence of Hydrogen Embrittlement effects on pipeline steels cathodically protected under static load conditions. On the contrary, in slow strain rate tests it is possible to observe the effect of the imposed potential and the strain rate on the hydrogen embrittlement steel behavior only after the necking of the specimens. J vs. Δa curves were measured on different pipeline steels in air and in aerated NaCl 3.5 g/L solution at free corrosion potential or under cathodic polarization at −1.05 and −2 V vs. SCE. The area under the J vs. Δa curves and the maximum crack propagation rate were taken into account. These parameters were compared with the ratio between the reduction of area in environment and in air obtained by slow strain rate test in the same environmental conditions and used to rank the different steels. View Full-Text
Keywords: hydrogen embrittlement; pipeline steel; mechanical fracture; cathodic protection hydrogen embrittlement; pipeline steel; mechanical fracture; cathodic protection
Show Figures

Figure 1

MDPI and ACS Style

Cabrini, M.; Sinigaglia, E.; Spinelli, C.; Tarenzi, M.; Testa, C.; Bolzoni, F.M. Hydrogen Embrittlement Evaluation of Micro Alloyed Steels by Means of J-Integral Curve. Materials 2019, 12, 1843.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop