The migration of H through a maraging steel was studied, at temperatures of between 373 and 590C, by using an ultra-high vacuum quadrupole mass spectrometry method and an input gas pressure of about 0.1MPa. The permeation parameters (table 75) were determined as a function of the aging time.
D.P.Yao, W.X.Chen, X.K.Sun, J.Xu: Scripta Metallurgica, 1988, 22[5], 611-5
Table 75
Permeation Parameters for Maraging Steel
Aging Time (h) | P (mol/msPa½) | E (kJ/mol) |
0 | 0.00147 | 41.9 |
1 | 0.00115 | 42.2 |
3 | 0.00142 | 43.3 |
5 | 0.00411 | 38.8 |