This work was conducted to address the experimental parameters influencing the formation of so-called superficial microgrooves during sulfide stress cracking (SSC) test that render sometimes difficult the decision on material qualification. It gives complementary results to a work published earlier.

Our investigations underline that, in our test conditions and for 2 different steel grades, grooving is not sulfide stress cracking initiation. Grooves can however act as stress concentrators and promote cracking. Calculation using finite element modelling allows to demonstrate that these initiations occur only if some plastic deformation is generated.

The discussion suggests that grooving and cracking are competing processes but that grooving should prevent seeing cracking if the tested material is susceptible.

Subject
Test methods, Materials, Grooves, Geometry, Plastic strain, Grooving, Crack initiation, Stress cracking, Stress, Steel, Sulfide stress cracking, Plastic deformation, Stress corrosion cracking
Keywords:
Sulfide stress Cracking, Grooving, Proof-Ring, 4-point bend
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2022
Association for Materials Protection and Performance (AMPP)
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