Effect of hydrogen on fracture and inert-environment sustained load cracking resistance of α- β titanium alloys

Meyn, D. A.

doi:10.1007/bf02644024

Cited by 123 publications

(20 citation statements)

References 17 publications

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“…Published work on sustained load cracking demon- strates that the growth rate of long cracks (Phase 3) in titanium alloys is accelerated by increasing hydrogen content [9]. The present fracture surfaces are consistent with this view exhibiting crack-arrest features at 10 p.p.m, but interface cracking at 50 p.p.m.…”

supporting

confidence: 88%

Dwell-sensitive fatigue in a near alpha-titanium alloy

Evans

1987

J Mater Sci Lett

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supporting

confidence: 88%

Dwell-sensitive fatigue in a near alpha-titanium alloy

Evans

1987

J Mater Sci Lett

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“…Assuming temperature, reaction rate and stress are maintained, local increases in hydrogen content will cause the fracture toughness of the hydrogen loaded region to reduce. Meyn showed that only small concentrations of hydrogen are required to cause cracking below the fracture toughness of the bulk alloy [44]. Upon reaching a critical value, the stress intensity at the base of the 500 crack will exceed the fracture toughness of the hydrogen concentrated region, allowing an increment of crack growth.…”

mentioning

confidence: 99%

Environmentally assisted fatigue crack nucleation in Ti–6Al–2Sn–4Zr–6Mo

et al. 2015

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An unexplained feature was observed at the fatigue crack origin of a number of α/β titanium specimens tested at 450• C in the low cycle fatigue regime. The origin was discoloured blue but this was not a result of temper colouration; this feature sometimes resulted in large reductions in fatigue lives. A number of specimens were examined to determine the cause and formation mechanism of these "blue spots." This feature was associated with elevated oxygen and chloride levels and the presence of sodium. A mechanism based on hot-salt stress-corrosion cracking is proposed and the implications for service components are discussed.

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“…This mechanism is applicable to the FCG at high mean stress levels in these alloy system. Although this phenomenon is also commonly observed in conventional titanium alloys as well [39,40], it appears that the intensity of it is much higher in the alloys: Ti-8.6A1, Ti-24A1-1 INb and Ti-33.5Al-2.5Mn. Because the average static "K" (K mean ) at high R is higher, static crack extension can be expected to occur, in addition to the cyclic crack extension produced by the cyclic stress intensity range (AK).…”

Section: Microstructurementioning

confidence: 66%

Fatigue of Bet Titanium Alloys

Ravichandran¹

2000

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0«DTXC QUÄLTET IK'SKüuxiiii) 3 REPORT DOCUMENTATION PAGE AFRL-SR-BL-TR-OO- Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instruc the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, inclu ABSTRACT (Maximum 200 words)A comprehensive investigation of the nature of fatigue in beta titanium alloys, especially in Ti-10V-3Fe-3Al alloy, emphasizing the crack initiation and crack growth aspects in controlled microstructural conditions, was performed. A detailed survey of literature of past work in this area, was also conducted. It has been found that the fatigue limit in this alloy is independent of the size, shape and volume fraction of the primary alpha particles. The matrix condition, as determined by the aging treatment had a strong influence on the fatigue behavior. It has been found that fatigue resistance could be improved only by controlling the aging treatment, that resulted in changes in the matrix microstructure. A mysterious fatigue behavior, exhibiting dual stress versus number of cycles to failure was also found in one microstructural condition. Aging treatments that resulted in omega phase precipitation, decreased the fatigue strength. In terms of fatigue crack growth response, omega phase increased the resistance to crack growth. Additionally, a strong sensitivity of fatigue crack growth to mean stress was also found with the omega precipitation. An evaluation of fatigue behavior of various titanium alloys was also made. It was concluded that microstructural refinement led to the minimal mean stress sensitivity in conventionally aged beta alloys, in comparison to other titanium alloys. The results are discussed in the light of microstructure, electron microscopy, fractography and quantitatitve determination of chemistry by energy-dispersive chemical analysis. SUBJECT TERMS SUMMARYA comprehensive investigation of the nature of fatigue in beta titanium alloys, especially in Ti-10V-3Fe-3Al alloy, emphasizing the crack initiation and crack growth aspects in controlled microstructural conditions, was performed. A detailed survey of literature of past work in this area, was also conducted. It has been found that the fatigue limit in this alloy is independent of the size, shape and volume fraction of the primary alpha particles. The matrix condition, as determined by the aging treatment had a strong influence on the fatigue behavior. It has been found that fatigue resistance could be improved only by controlling the aging treatment, that resulted in changes in the matrix microstructure. A mysterious fatigue behavior, exhibiting dual stress versus number of cycles to failure was also found in one microstructural condition.Aging treatments that resulted in omega phase precipitation, decreased the fatigue strength. In terms of fatigue crack growth response, omega phase increased the resistance to crack growth.Additionally, a strong sensitivity of...

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Effect of hydrogen on fracture and inert-environment sustained load cracking resistance of α- β titanium alloys

Cited by 123 publications

References 17 publications

Dwell-sensitive fatigue in a near alpha-titanium alloy

Dwell-sensitive fatigue in a near alpha-titanium alloy

Environmentally assisted fatigue crack nucleation in Ti–6Al–2Sn–4Zr–6Mo

Fatigue of Bet Titanium Alloys

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