Hydrogen-enhanced load relaxation in a deformed medium-carbon steel

Oriani, R. A.; Josephic, P.H.

doi:10.1016/0001-6160(79)90187-1

Cited by 124 publications

(21 citation statements)

References 9 publications

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“…In order to match the peak area of the experimental spectrum, the surface concentration of hydrogen was determined to be very high (510 ppm), as expected in cathodic charge. [19] The temperature at the peak hydrogen evolution rate was relatively low [~373 K (~100°C)], and this peak temperature is reproduced very well by calculations using both the reported S-K and M-K diffusivities (Figure 10(b)). Such a low peak temperature was also obtained in cathodically charged Type 316L specimens.…”

Section: Simulation Of Tda Spectra By Mcnabb-foster Modelsupporting

confidence: 58%

Hydrogen Absorption into Austenitic Stainless Steels Under High-Pressure Gaseous Hydrogen and Cathodic Charge in Aqueous Solution

Enomoto

Cheng

Mizuno

et al. 2014

Metallurgical and Materials Transactions E

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Type 316L and Type 304 austenitic stainless steels, both deformed and non-deformed, were hydrogen charged cathodically in an aqueous solution as well as by exposure to high-pressure gaseous hydrogen in an attempt to identify suitable conditions of cathodic charge for simulating hydrogen absorption from gaseous hydrogen environments. Thermal desorption analysis (TDA) was conducted, and the amount of absorbed hydrogen and the spectrum shape were compared between the two charging methods. Simulations were performed by means of the McNabb-Foster model to analyze the spectrum shape and peak temperature, and understand the effects of deformation on the spectra. It was revealed that the spectrum shape and peak temperature were dependent directly upon the initial distribution of hydrogen within the specimen, which varied widely according to the hydrogen charge condition. Deformation also had a marked effect on the amount of absorbed hydrogen in Type 304 steel due to the straininduced martensitic transformation.

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Section: Simulation Of Tda Spectra By Mcnabb-foster Modelsupporting

confidence: 58%

Hydrogen Absorption into Austenitic Stainless Steels Under High-Pressure Gaseous Hydrogen and Cathodic Charge in Aqueous Solution

Enomoto

Cheng

Mizuno

et al. 2014

Metallurgical and Materials Transactions E

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“…All previous explanations assumed the ductile features evident on fracture surface were simply aftereffects of the embrittlement process and therefore inconsequential in terms of the mechanism. [69][70][71] What makes Beachem's interpretations remarkable, is that is now apparent that the morphological features evident on fracture surfaces do not give an accurate depiction of the underlying deformation process that determined the failure mode or path.…”

Section: Hydrogen-enhanced Dislocation Motionmentioning

confidence: 99%

Hydrogen Embrittlement Understood

Robertson

Sofronis

Nagao

et al. 2015

Metall Mater Trans B

464

186

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The connection between hydrogen-enhanced plasticity and the hydrogen-induced fracture mechanism and pathway is established through examination of the evolved microstructural state immediately beneath fracture surfaces including voids, ''quasi-cleavage,'' and intergranular surfaces. This leads to a new understanding of hydrogen embrittlement in which hydrogenenhanced plasticity processes accelerate the evolution of the microstructure, which establishes not only local high concentrations of hydrogen but also a local stress state. Together, these factors establish the fracture mechanism and pathway.

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“…This increase in ductile nature is to be expected when the effects of hydrogen on steels such as these are considered. Oriani and Josephic [78] found that hydrogen reduced the lattice-cohesion strength for pearlitic 1045 steel (i.e., decohesion occurs at a lower applied stress with increasing C H ). As a result, void nucleation at ferrite/cementite interfaces, followed by growth within the ferrite, occurs more readily.…”

Section: Proposed Hydrogen Embrittlement Mechanism Associated Withmentioning

confidence: 99%

A critical-strain criterion for hydrogen embrittlement of cold-drawn, ultrafine pearlitic steel

Enos¹,

Scully

2002

Metall Mater Trans A

125

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A stress-modified, critical-strain model of fracture-initiation toughness has been adapted to the case of hydrogen-affected pearlite shear cracking, which is a critical event in transverse fracture of colddrawn, pearlitic steel wire. This shear cracking occurs via a process of cementite lamellae failure, followed by microvoid nucleation, growth, and linkage to create shear bands that form across pearlite colonies. The key model feature is that the intrinsic resistance to shear-band cracking at a transverse notch or crack is related to the effective fracture strain at the notch root. This fracture strain decreases with the logarithm of the diffusible hydrogen concentration (C H ). Good agreement with experimental transverse fracture-initiation-toughness values was obtained when the sole adjustable parameter of the model, the critical microstructural dimension (l*), was set to the mean dimension of shearable pearlite colonies within this steel. The effect of hydrogen was incorporated through the relationship between local effective plastic strain ( f eff ) and C H , obtained from sharply and bluntly notched tensile specimens analyzed by finite-element analysis (FEA) to define stress and strain fields. No transition in the transverse fracture-initiation morphology was observed with increasing constraint or hydrogen concentration. Instead, shear cracking from transverse notches and precracks was enabled at lower global applied stresses when C H increased. This shear-cracking process is assisted by absorbed and trapped hydrogen, which is rationalized to either reduce the cohesive strength of the Fe/Fe 3 C interface, localize slip in ferrite lamellae so as to more readily enable shearing of Fe 3 C by dislocation pileups, or assist subsequent void growth and link-up. The role of hydrogen at these sites is consistent with the detected hydrogen trapping. Large hydrogen-trap coverages at carbides can be demonstrated using trap-binding-energy analysis when hydrogen-assisted shear cracking is observed at low applied strains.

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Hydrogen-enhanced load relaxation in a deformed medium-carbon steel

Cited by 124 publications

References 9 publications

Hydrogen Absorption into Austenitic Stainless Steels Under High-Pressure Gaseous Hydrogen and Cathodic Charge in Aqueous Solution

Hydrogen Absorption into Austenitic Stainless Steels Under High-Pressure Gaseous Hydrogen and Cathodic Charge in Aqueous Solution

Hydrogen Embrittlement Understood

A critical-strain criterion for hydrogen embrittlement of cold-drawn, ultrafine pearlitic steel

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