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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.43  No.4 (2002)  >  pp.727-734

MATERIALS TRANSACTIONS
<<Previous article Vol.43  No.4 (2002)   pp.727 - 734 Next article>>

Non-Destructive Evaluation of Fatigue Damage in Type 316 Stainless Steel Using Positron Annihilation Lineshape Analysis

Yasuhiro Kawaguchi1), Noriko Nakamura2) and Satoru Yusa2)
1) Institute of Nuclear Technology, Institute of Nuclear Safety System, Inc.
2) Research Laboratory, Ishikawajima-Harima Heavy Industries Co., Ltd.


We applied positron annihilation lineshape analysis for non-destructive evaluation of fatigue stored in type 316 stainless steel, mainly used in primary water lines of pressurized water reactors (PWR). Using 68Ge as a positron source, an energy spread of annihilation gamma ray peaks from stainless steel specimens was measured. After preparing stress- and strain-controlled fatigue specimens, we investigated the relation between fatigue life and a non-destructive parameter of lineshape analysis defined as the S-parameter and compared the microstructure of the fatigue specimens with the S-parameter. As a result, there was good correlation between the S-parameter and fatigue life; the S-parameter increased with dislocation density monotonically. The relation between the S-parameter and fatigue life in stress-controlled fatigue differed from that in strain-controlled fatigue. The S-parameter increased faster in early stage of the latter than in the former. In stress-controlled fatigue, the change in the S-parameter did not depend on stress amplitude in the range of ratio to yield stress under 0.9. In the strain-controlled fatigue, the change in the S-parameter did not depend on strain amplitude in the range from 0.25 to 0.31%. However, when stress amplitude or strain amplitude became higher, the change in the S-parameter increased largely in the early stage of the fatigue life. We demonstrated systematic data to evaluate the fatigue damage in type 316 stainless steel.


Keyword:
fatigue, non-destructive evaluation, positron annihilation, annihilation gamma ray, type 316 stainless steel, S-parameter

Received: January 11, 2002
Accepted: February 26, 2002 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals

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