Study on delayed fracture of high strength steels by thermal hydrogen analysis technique

摘要

Hydrogen embrittlement is caused by diffusible hydrogen at ambient temperature. The diffusible hydrogen is trapped at defects in lattice such as dislocation. The detectable limit of diffusible hydrogen can be improved up to less than 0.01 mass ppm by the usage of mass spectroscopy as a detector in thermal analysis. The thermal analysis technique is effective to in- vestigate hydrogen trapping in steel, because degrassing temperatures depend upon the trapping energy. The study on de- layed fracture has been made remarkable progress by the application of this thermal analysis.