Effect of mean stress on hydrogen assisted fatique crack propagation in duplex stainless steel

Marrow, T.J.; Hippsley, C.A. and King, J.E. (1991). Effect of mean stress on hydrogen assisted fatique crack propagation in duplex stainless steel. Acta Metallurgica et Materialia, 39 (6), pp. 1367-1376.

Abstract

Hydrogen assisted subcritical cleavage of the ferrite matrix occurs during fatigue of a duplex stainless steel in gaseous hydrogen. The ferrite fails by a cyclic cleavage mechanism and fatigue crack growth rates are independent of frequency between 0.1 and 5 Hz. Macroscopic crack growth rates are controlled by the fraction of ferrite grains cleaving along the crack front, which can be related to the maximum stress intensity, Kmax. A superposition model is developed to predict simultaneously the effects of stress intensity range (ΔK) and K ratio (Kmin/Kmax). The effect of Kmax is rationalised by a local cleavage criterion which requires a critical tensile stress, normal to the {001} cleavage plane, acting over a critical distance within an embrittled zone at the crack tip. © 1991.

Publication DOI: https://doi.org/10.1016/0956-7151(91)90224-O
Divisions: Aston University (General)
Uncontrolled Keywords: hydrogen,iron and steel metallography,stresses,Ferrite,fatigue crack propagation,stainless steel
Published Date: 1991-06

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