Embrittlement of a ferrous alloy in a partially dissociated hydrogen environment

Nelson, H. G.; Williams, D. P.; Tetelman, A. S.

doi:10.1007/bf02664224

Cited by 96 publications

(16 citation statements)

References 3 publications

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“…A number of studies of subcritical crack growth in high-strength steels in water, water vapor and hydrogen have been made [1,[5][6][7][8][9][10][11]. Hydrogen was assumed to be responsible for the enhancement of crack growth in each of these environments.…”

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confidence: 99%

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Fracture mechanics and surface chemistry studies of subcritical crack growth in AISI 4340 steel

1978

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confidence: 99%

“…Since these observations were made on different steels [1,5,6,7,10,11) and since there were no data on initial surface reactions, unambiguous mechanistic interpretations could not be made.…”

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confidence: 99%

Fracture mechanics and surface chemistry studies of subcritical crack growth in AISI 4340 steel

1978

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“…In pre-cracked specimens, and· with a fixed hydrogen pressure, the brittleness decreased with increasing displacement rate, (2) was a maximum in rate near 300'K and decreased at both higher and lower temperatures; similar behavior patterns are observed with internal hydrogen brittleness In a later paper (3,4)· (5) partial dissociation of low pressure hydrogen gas, with a consequent increase in atomic hydrogen concentration in the gas phase, was shown to markedly increase the growth rate of hydrogen-induced oracks.…”

Section: Introductionmentioning

confidence: 57%

Hydrogen brittleness in hydrogen and hydrogen-oxygen gas mixtures

Johnson¹

1973

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“…Mo rich low temperature precipitates also promote (22) strongly the deformation by the coplanar slip mode as Ti rich precipitates do. Therefore, it must be said that the significant difference in the delayed failure behaviors in air environment among different precipitates is due to strong influence of an ability supplying hydrogen rather than due to difference in the deformation mode (31).…”

Section: Ni3ti(do24)i Precipitates (23)mentioning

confidence: 99%

Delayed Failure and Precipitation Behavior in Maraging Steels

Asayama

1987

Trans. JIM

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The relationship between delayed failure occurring in air environment and precipitation behaviors was studied on maraging steels by sustained load test and electrical resistivity measurement.The formation of low temperature precipitates associated with the presence of titanium was found to have a close relation to the delayed failure occurring on cobalt free maraging steels containing titanium as a main hardening element. In case of 18% Ni maraging steels, the delayed failure in air environment was scarcely affected by the precipitation of Mo rich low temperature precipitates which played an important role in the hardening at low temperature aging, but the delayed failure began to be markedly revealed depending on the titanium content, when titanium was added in the 186/ Ni maraging steels. It was estimated from the activation energies that the delayed failure of 18% Ni maraging steels was also significantly affected by the formation of the low temperature precipitates relevant to titanium.Since it is assumed that the delayed failure is controlled by interaction between dislocation motion cutting the coherent precipitates and hydrogen introduced by dissociation of water adsorbed on the steel surface, the reason why the delayed failure does not occur by the formation of Mo low temperature precipitates only would be that Mo rich low temperature precipitates do not promote the dissociation of water adsorbed on the steel surface unlike the low temperature precipitates relevant to titanium.(Received December 20, 1986) -Keywords: cobalt free maraging steel, 18% nickel maraging steel, delayed failure, sustained load test, activation energy, electrical resistivity, effect of isothermal aging, effect of isochronal aging

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Embrittlement of a ferrous alloy in a partially dissociated hydrogen environment

Cited by 96 publications

References 3 publications

Fracture mechanics and surface chemistry studies of subcritical crack growth in AISI 4340 steel

Fracture mechanics and surface chemistry studies of subcritical crack growth in AISI 4340 steel

Hydrogen brittleness in hydrogen and hydrogen-oxygen gas mixtures

Delayed Failure and Precipitation Behavior in Maraging Steels

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