Environmental Engineering Reference
In-Depth Information
500
Fast fluence (Cd-Wrapped)
Total fluence
400
300
200
100
0
Fe 300
Fe 190
Fe 110
Fe 50
Material
1020
A516
A588
1.21
Bar chart of yield stress for Armco-iron and steels (1020, A516 and
A588) following fast and total neutron radiation exposures of 2.8
×
10
18
and 3.4
×
10
19
n/cm
2
, respectively.
30
350
Hall-petch plots - Armco-Fe
Fast flux (Cd-wrapped)
Total flux
325
300
275
250
225
200
0.04
0.06
0.08
0.10
0.12
0.14
0.16
1/sqrt(D)
1.22
Effects of fast and total neutron fl uences on Hall-Petch plots for
pure iron.
30
which (means larger values of the abscissa) fast neutron fl uence would have
a slightly larger effect on hardening than exposure to total fl u x .
Although ferritic steels such as those commonly used for pressure bound-
ary and reactor support applications have very small grain sizes (<50
μ
m),
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