Corrosion‐fatigue behaviour of Cr–Mo steel under biaxial tension

Vidit Gaur (1) , Véronique Doquet (2) , Emmanuel Persent (3) , Eléonore Roguet (3)

1 Department of Mechanical and Industrial Engineering, IIT Roorkee
2 LMS - Laboratoire de mécanique des solides
3 IFPEN - IFP Energies nouvelles

Combined cyclic tension and internal pressure tests with various proportions of each loading were run on a 2.5%Cr–1%Mo steel in air and in 3.5% NaCl solution, with and without cathodic protection to investigate the effect of positive stress biaxiality on corrosion‐fatigue lives and damage mechanisms. At free potential, a strong reduction in fatigue resistance was observed for uniaxial as well as for equibiaxial cyclic tension and attributed to multiple crack initiation from corrosion pits. Cathodic protection completely cancelled the detrimental effect of the corrosive environment on fatigue lives whatever the load biaxiality was, in spite of an obvious enhancement of intergranular fracture attributed to hydrogen embrittlement.

Mots clés: biaxial tension; corrosion fatigue; hydrogen embrittlement; intergranular facets; pits; steel

Domaines: Mécanique des matériaux [physics.class-ph]

Vidit Gaur, Véronique Doquet, Emmanuel Persent, Eléonore Roguet. Corrosion‐fatigue behaviour of Cr–Mo steel under biaxial tension. Fatigue and Fracture of Engineering Materials and Structures, 2020, 43 (11), pp.2560-2570. ⟨10.1111/ffe.13276⟩. ⟨hal-02995567⟩