The influence of gas and electrolytic hydrogenation on the mechanical properties of 07Kh16N6 steel
摘要
The influence of gaseous hydrogen in the pressure range of 0–10 MPa and electrolytic hydrogenation time of 0–10 h at a current density of 5 × 10−2 A/m2 on the strength and plasticity of smooth and notched samples of martensitic stainless 07Cr16Ni6 steel was studied at the deformation rates of 0.1 and 1 mm/min. It was found that gaseous hydrogen has almost no influence on the ultimate tensile strength and yield strength of smooth specimens. The ultimate tensile strength of notched specimens and the plastic characteristics of smooth and notched specimens are reduced by 40–87% under the influence of hydrogen. The maximum hydrogen embrittlement was revealed at a tensile rate of 0.1 mm/min, hydrogen pressure of 5 MPa, or after electrolytic hydrogenation for 5 h at a current density of 5 × 10−2 A/m2. The cadmium coating significantly reduces the hydrogen influence at room temperature but does not protect against hydrogen absorption at 473 K. The fractographic features of fracture in the presence of hydrogen are analyzed.