The migration of H through 18Ni-13Co-4wt%Mo maraging steel was studied, at 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 155) 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 156

Tracer Diffusion Coefficient, DCr, in the Fe-Ni-Cr System at 1223K

 

Ni (wt%)

Cr (wt%)

Value(m2/s)

70

18

9.30 x 10-13

71

20

1.13 x 10-12

72

21

2.87 x 10-13

67

12

1.84 x 10-12

54

24

4.60 x 10-13

85

9

3.21 x 10-13

85

11

7.38 x 10-13

84

13

3.45 x 10-12

30

26

5.98 x 10-13

58

24

6.33 x 10-13

75

24

8.29 x 10-13

50

15

7.12 x 10-13

45

28

8.75 x 10-13

57

29

2.76 x 10-12

35

19

4.21 x 10-13

42

30

1.42 x 10-12