Tensile failure of stainless-steel notched bars under hydrogen charging

Journal Article · Mon Apr 01 04:00:00 EST 1996 · Journal of Engineering Materials and Technology

DOI:https://doi.org/10.1115/1.2804885· OSTI ID:237785

Valiente, A; Cortes, R; Caballero, L ^[1]; Toribio, J ^[2]

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1. Polytechnical Univ. of Madrid (Spain). Dept. of Materials Science
2. Univ. of La Coruna (Spain). Dept. of Materials Science

The influence of hydrogen embrittlement on the tensile failure of 316 L stainless-steel notched bars is phenomenologically modeled in this paper. Tensile tests of notched samples suffering hydrogen embrittlement show that hydrogen damage consists in multicracking in the area surrounding the notch, but the macromechanical behavior of the specimens remains ductile. This suggests two different ways for modeling the damage in order to explain its effect on the tensile failure load. The Notch Extension Model (NEM) considers that damage intensity around the notch is high enough to cancel out the mechanical resistance of this multicracked zone, so it assumes that the hydrogen effect is equivalent to a geometric enlargement of the notch. In the Notch Cracking Model (NCM), it is assumed that high intensity damage is concentrated at the notch root and causes this area to behave as a macroscopic crack that extends the original notch. Experimental values from tests and calculated values from models indicate that the notch extension model describes well the influence of hydrogen on the tensile notch behavior of 316 L stainless steel.

• Sponsoring Organization: USDOE
• OSTI ID: 237785
• Journal Information: Journal of Engineering Materials and Technology, Journal Name: Journal of Engineering Materials and Technology Journal Issue: 2 Vol. 118; ISSN 0094-4289; ISSN JEMTA8
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHEMICAL COMPOSITION
CORRELATIONS
CRACKS
DAMAGE
ELONGATION
EXPERIMENTAL DATA
HYDROGEN EMBRITTLEMENT
MATHEMATICAL MODELS
NOTCHES
PREDICTION EQUATIONS
STAINLESS STEEL-316L
STRAINS
STRESSES
TENSILE PROPERTIES