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15
500
Extrapolated from
high temperature data
10
400
5
300
Mild steel
(room temperature)
200
0
0
10
20
30
10
-5
(
φ
t
)
1/3
1. 15
Effect of neutron irradiation on yield stress and Luders strain in
mild steel.
Mild steel
200
150
100
100
0
50
10
-8
φ
t
1. 16
Effect of neutron irradiation on friction (
σ
i
) and source (
σ
s
) for mild
steel.
23
as square-root of fl uence as noted in Fig. 1.16.
23
Since
s
decreased with
increase in fl uence, the yield stress, being the sum of these two factors, should
be a function of fl uence raised to a power slightly less than 0.5. In FCC met-
als such as stainless steel, source hardening is very small before irradiation
σ
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