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

Marrow, T.J., Hippsley, C.A. and King, J.E. 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)
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Uncontrolled Keywords: hydrogen,iron and steel metallography,stresses,Ferrite,fatigue crack propagation,stainless steel

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