Tensile flow and fracture behaviour of austenitic stainless steels after thermal aging in a hydrogen atmosphere Academic Article uri icon


  • A hydrogen content of about 300 at. ppm introduced by concurrent sensitization and precharging from the gas phase at 600° C of type 304L and 316L austenitic stainless steels induced a noticeable degradation of the mechanical properties, changes in fracture mode or morphology and an increase in the amount of deformation martensite. The various changes in properties were revealed on post-treatment tensile testing in air at ambient temperature, scanning electron microscopy fractography and X-ray diffractometry. The degradation of the mechanical properties was described quantitatively by a detailed examination of the entire range of uniform deformation. The relevant effects were (a) ductility losses of the order of 30%,(b) flow stress increases (hydrogen hardening) of the order of from 7%(type 304L steel) to 10%(type 316L steel) at moderate and large strains and (c) a decrease in the strain …

publication date

  • October 1, 1984