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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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