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EFFECTS OF HYDROGEN CHARGING ON AUSTENITIC ALLOYS: A COMPARATIVE STUDY OF TYPE-321 STAINLESS STEEL AND Fe-1.95C BINARY AUSTENITIC STEEL

The cold rolled AISI-321 austenitic stainless steel after prolonged cathodic polarizations in an aqueous electrolytic medium of sulfuric acid containing arsenic (V) oxide [0.1 Μ H 2 S 0 4 + lg/1 As2O s(V) ] undergoes structural transformation involving macroscopic buckling, permanent bending, and eventual tearing along the edges. Microscopically, dislocation networks, stacking faults, and martensitic phases are observed with prolonged Η-charging. When compared to the charging of high Fe-C austenites, Fe-C system shows surface striations whereas none is observed with the stainless steel. While buckling and bending are also observed in FeC alloys, lathes-like α'-martensites are observed in stainless steel, while acicular types in the Fe-C alloys. The optimal cathodic polarization necessary to provoke structural deformation for Fe-C alloy is within 2200 A/m , while it is in the range is 50-5000 A/m for Type-321. Mössbauer effect measurements (MEM) show that both materials decompose with retained austenite in proportion to degree of hydrogen charging, with an upper limit of 63% transformation in Fe-1.5C, while a mere 13% in the case of AISI-321.