Study on the Influence of Surface Integrity on Hydrogen Permeation Resistance of Hydrogen Production Reactor Materials

Hydrogen permeation reduces a material’s properties and increases the risk of brittle fracture, which causes potential safety hazard. A workpiece’s hydrogen resistance could be improved by improving its surface integrity through processing. This paper studies low-alloy steel’s in production reactor, using electrochemical cathodic hydrogen-charging method to carry out experiments. After specimens were pretreated different surface-grinding methods shot peening pressure strengthening, they hydrogen-charged on self-designed built electrolytic charging platform. Before after charging, specimens’ section hardness tensile strength tested, fracture morphology was observed. The influence laws roughness residual compressive stress distribution material along depth, variation hardness, morphology, decline steel 5 h analyzed. reasons for indexes also Based experimental results, series mechanical processing parameters proposed improve resistance, provides theoretical practical basis materials with high resistance. Through experiments, it found that Ra 0.17 μm specimen best all values, embrittlement sensitivity index 20.96%. had under 336 MPa compress stress, 16.45%.