J Mater Sci Technol ›› 1990, Vol. 6 ›› Issue (3): 200-205.

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Hydrogen Trapping Phenomenon at Grain Boundaries in a 18Ni Maraging Steel

YAO Daping CHEN Wenxiu Institute of Metal Research,Academia Sinica Wenhua Rd.,Shenyang.110015,China   

  • Received:1990-05-28 Revised:1990-05-28 Online:1990-05-28 Published:2009-10-10

Abstract: An investigation of the phenomenon of hydrogen trapping at grain boundaries in 18 Ni maraging steel has been carried out by the thermal hydrogen evolution technique.Grain boundary on- ly acts as a trapping site of hydrogen at low temper- ature region,and the peak of its hydrogen evolution from it is observed at 405K with 3.00K/rain heat- ing rate and with specimen of 0.55mm thick.The trap activation energy of hydrogen escaped from grain boundary is estimated as 14.2kJ/mol. Hydrogen trapping at grain boundary is mainly as sociated with segregated hydrogen by impurities, and its behaviour is primarily the interaction be- tween hydrogen and the hydrostatic stress field of the grain boundary.

Key words: hydrogen trapping, grain boundary, maraging steel