Microstructural trapping effects on hydrogen induced cracking of a microalloyed steel

Stevens, M.F.; Bernstein, I. M.

doi:10.1007/bf02651657

Cited by 55 publications

(14 citation statements)

References 35 publications

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“…They also reported that the trapping efficiency increased with sulphur content. In addition to inclusions, precipitates of Ti, Nb and V such as TiC, TiN, NbC, VC, complex Ti,Nb(C,N), Ti 4 C 2 S 2 etc., are all considered to be irreversible traps [2,[17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Effect of microstructure and composition on hydrogen permeation in X70 pipeline steels

Haq

Muzaka

Dunne

et al. 2013

International Journal of Hydrogen Energy

163

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The influence of microstructure and composition on permeation of hydrogen in 1.2 and 0.5 wt.% Mn X70 pipeline steels after different processing was investigated using an electrochemical permeation technique. For 1.2 wt.% Mn (standard Mn) steel, the microstructure of normalised transfer bar was coarse equiaxed ferrite grains. This sample exhibited the highest diffusivity, followed by transfer bar, with a mixed ferriteebainitic ferrite microstructure; and hot rolled strip, with fine elongated ferrite grains. The 0.5 wt.% Mn (medium Mn) strip displayed lower diffusivity than the 1.2 wt.% Mn strip, due to hydrogen trapping by finer ferrite grains and a higher density of carbonitride precipitates. Moreover, the medium Mn strip exhibited a uniform microstructure and consequently similar diffusion coefficients for the edge and centreline regions, whereas the finer grains of the edge region of the standard Mn strip resulted in a lower diffusivity than the centreline region. Copyright © 2012, Hydrogen Energy Publications, LLC. AbstractThe influence of microstructure and composition on permeation of hydrogen in 1.2 and 0.5 wt.% Mn X70 pipeline steels after different processing was investigated using an electrochemical permeation technique. For 1.2 wt.% Mn (standard Mn) steel, the microstructure of normalised transfer bar was coarse equiaxed ferrite grains. This sample exhibited the highest diffusivity, followed by transfer bar, with a mixed ferrite -bainitic ferrite microstructure; and hot rolled strip, with fine elongated ferrite grains.The 0.5 wt.% Mn (medium Mn) strip displayed lower diffusivity than the 1.2 wt.% Mn strip, due to hydrogen trapping by finer ferrite grains and a higher density of carbonitride precipitates.Moreover, the medium Mn strip exhibited a uniform microstructure and consequently similar diffusion coefficients for the edge and centreline regions, whereas the finer grains of the edge region of the standard Mn strip resulted in a lower diffusivity than the centreline region.

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Section: Introductionmentioning

confidence: 99%

Effect of microstructure and composition on hydrogen permeation in X70 pipeline steels

Haq

Muzaka

Dunne

et al. 2013

International Journal of Hydrogen Energy

163

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“…They suggested taking advantage of good hydrogen traps with respect to their ability to either increase the time to reach the critical concentration or to disperse the hydrogen, so that the critical local concentration is not reached [3]. Hydrogen trapping is expected to improve the resistance of high-strength steels to hydrogen embrittlement, and the role of hydrogen-trapping materials such as VC [4] and TiC [5] has been studied.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen embrittlement property of a 1700-MPa-class ultrahigh-strength tempered martensitic steel

Akiyama

Kimura

et al. 2010

Science and Technology of Advanced Materials

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The hydrogen embrittlement property of a prototype 1700-MPa-class ultrahigh-strength steel (NIMS17) containing hydrogen traps was evaluated using a slow strain rate test (SSRT) after cathodic hydrogen precharging, cyclic corrosion test (CCT) and atmospheric exposure. The hydrogen content in a fractured specimen was measured after SSRT by thermal desorption spectroscopy (TDS). The relationship between fracture stress and hydrogen content for the hydrogen-precharged specimens showed that the fracture stress of NIMS17 steel was higher, at a given hydrogen content, than that of conventional AISI 4135 steels with tensile strengths of 1300 and 1500 MPa. This suggests better resistance of NIMS17 steel to hydrogen embrittlement. However, hydrogen uptake to NIMS17 steel under CCT and atmospheric exposure decreased the fracture stress. This is because of the stronger hydrogen uptake to the steel containing hydrogen traps than to the AISI 4135 steels. Although NIMS17 steel has a higher strength level than AISI 4135 steel with a tensile strength of 1500 MPa, the decrease in fracture stress is similar between these steels.

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“…Indeed, cementite in the absence of a significant trapping capacity can be positively harmful in initiating hydrogen-induced cracking. 131) ε-carbide as a phase can absorb hydrogen and even form a compound Fe 2 HC, in addition to acting as a trap via its coherency strain fields.…”

Section: ε-Carbide and Cementitementioning

confidence: 99%

Prevention of Hydrogen Embrittlement in Steels

2016

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The essential facts about the nature of the hydrogen embrittlement of steels have now been known for 140 years. It is diffusible hydrogen that is harmful to the toughness of iron. It follows, therefore, that the harmful influence of diffusible hydrogen can be mitigated by preventing its entry into steel or by rendering it immobile once it penetrates the material. This review deals with the methods that might be implemented to design steels and components that resist hydrogen embrittlement by reducing the intake of hydrogen or rendering it innocuous when it does penetrate the steel.

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Microstructural trapping effects on hydrogen induced cracking of a microalloyed steel

Cited by 55 publications

References 35 publications

Effect of microstructure and composition on hydrogen permeation in X70 pipeline steels

Effect of microstructure and composition on hydrogen permeation in X70 pipeline steels

Hydrogen embrittlement property of a 1700-MPa-class ultrahigh-strength tempered martensitic steel

Prevention of Hydrogen Embrittlement in Steels

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