Environmental Engineering Reference
In-Depth Information
1.30
Intergranular fracture surface morphology of IASCC (304 SS,
3 dpa). Corrosion debris and cracks along grain boundaries can be
seen.
56
66.8
Crack growth rate
5 × 10
-7
mm/s
66.4
Crack growth rate
6 × 10
-7
mm/s
66
65.6
H
2
addition
O
2
addition
65.2
64.8
0
5
10
15 20
Time, days
25
30
35
1.31
Typical reduction in crack growth rate by the addition of hydrogen
in annealed 304 SS.
57
both IASCC and IGSCC require external stress, temperature and dissolved
oxygen in the water environment, the former is accelerated by neutron
radiation. It is recognized that the infl uence of water chemistry becomes
weaker and disappears at high doses (>50 dpa) suggesting that mechanical
processes dominate chemical processes in IASCC.
58
The major distinctions
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