Elevated Temperature Stress Corrosion Resistance of Titanium Alloys

Newcomer, R.; Tourkakis, H.C.; Turner, H. C.

doi:10.5006/0010-9312-21.10.307

Cited by 5 publications

(1 citation statement)

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“…Initiation and growth of subcritical-cracks in engineering materials is known to occur under the combined action of applied stress and chemically aggressive service environment [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. This phenomenon is commonly referred to as stress corrosion cracking*, delayed failure or static fatigue.…”

Section: Introductionmentioning

confidence: 99%

The kinetics of subcritical crack growth under sustained loading

Landes

Wei

1973

Int J Fract

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The kinetics of subcritical crack growth under sustained loading for an AISI 4340 steel tempered at 400°F in distilled water were determined. Crack growth experiments were carried out over a range of temperatures from 10-75 ° C, using the crack tip stress intensity factor, K, to characterize the mechanical driving force. Results show that crack growth in distilled water is controlled by a thermally activated process with apparent activation energies that depend on K. Crack growth occurred only above a threshold K level with growth rates showing a strong K dependence at lower values of K and attaining constant, rate limiting values at higher K levels. The rate limiting velocities correspond to an apparent activation energy of 8000___ 1000 cal/mole, in essential agreement with values reported for crack growth in similar steels. This apparent activation energy corresponds to that for hydrogen permeation in AISI 4340 steel and lends further support to the concept that the rate limiting process for crack growth in high strength steels in water is that of hydrogen permeation into the crack-tip region. Because of the differences in the apparent activation energies for crack growth in water and in gaseous hydrogen, the rate limiting step in the permeation process still needs to be defined.

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