Abstract
Since the hydrogen content causing delayed fracture (hydrogen embrittlement) of some high strength steels is in the order of 0.01 weight ppm, accurate measurement is required. The present situation of hydrogen gas desorption analysis for the studies of hydrogen embrittlement of high strength steels is reviewed, and evaluation techniques of hydrogen embrittlement property using constant load test and slow strain rate test of hydrogen precharged specimens in conjunction with hydrogen desorption analysis are illustrated. In addition, measurement of hydrogen entry from the atmospheric corrosion environment is presented. Both critical hydrogen content for delayed fracture, obtained by means of the above mentioned tensile tests, and hydrogen content from environment are important parameters to evaluate delayed fracture susceptibility of high strength steels. The results of round robin tests of measurement of hydrogen content in steels using thermal desorption analysis is also introduced.
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