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Behavior of duplex stainless steel casting defects under mechanical loadings

Abstract

Several components in the primary circuit of pressurized water reactors are made of cast duplex stainless steels. This material contains small casting defects, mainly shrinkage cavities, due to the manufacturing process. In safety analyses, the structural integrity of the components is studied. In order to assess the real severity of the casting defects under mechanical loadings, an experimental program was carried out. It consisted of testing, under both cyclic and monotonic solicitations, three-point bend specimens containing either a natural defect (in the form of a localized cluster of cavities) or a machined notch having the dimensions of the cluster`s envelope. The tests are analyzed in order to develop a method that takes into account the behavior of castings defects in a more realistic fashion than by an envelope crack. Various approaches are investigated, including the search of equivalent defects or of criteria based on continuum mechanics concepts, and compared with literature data. This study shows the conservatism of current safety analyses in modelling casting defects by envelope semi-elliptical cracks and contributes to the development of alternative approaches. (author) 18 refs.
Authors:
Jayet-Gendrot, S; [1]  Gilles, P; Migne, C [2] 
  1. Electricite de France, 77 - Moret-sur-Loing (France). Dept. of Materials Study
  2. Societe Franco-Americaine de Constructions Atomiques (FRAMATOME), 92 - Paris-La-Defense (France)
Publication Date:
Apr 01, 1997
Product Type:
Technical Report
Report Number:
EDF-97-NB-00130
Reference Number:
SCA: 210200; PA: AIX-29:054680; EDB-98:105256; SN: 98002017235
Resource Relation:
Other Information: DN: 18 refs.; PBD: Apr 1997
Subject:
21 NUCLEAR POWER REACTORS AND ASSOCIATED PLANTS; CASTING; CRACKS; CRYSTAL DEFECTS; PRIMARY COOLANT CIRCUITS; PWR TYPE REACTORS; SAFETY; STAINLESS STEELS
OSTI ID:
654874
Research Organizations:
Electricite de France (EDF), 92 - Clamart (France). Direction des Etudes et Recherches
Country of Origin:
France
Language:
English
Other Identifying Numbers:
Other: ON: DE99602922; TRN: FR9800258054680
Availability:
INIS; OSTI as DE99602922
Submitting Site:
FRN
Size:
14 p.
Announcement Date:
Oct 28, 1998

Citation Formats

Jayet-Gendrot, S, Gilles, P, and Migne, C. Behavior of duplex stainless steel casting defects under mechanical loadings. France: N. p., 1997. Web.
Jayet-Gendrot, S, Gilles, P, & Migne, C. Behavior of duplex stainless steel casting defects under mechanical loadings. France.
Jayet-Gendrot, S, Gilles, P, and Migne, C. 1997. "Behavior of duplex stainless steel casting defects under mechanical loadings." France.
@misc{etde_654874,
title = {Behavior of duplex stainless steel casting defects under mechanical loadings}
author = {Jayet-Gendrot, S, Gilles, P, and Migne, C}
abstractNote = {Several components in the primary circuit of pressurized water reactors are made of cast duplex stainless steels. This material contains small casting defects, mainly shrinkage cavities, due to the manufacturing process. In safety analyses, the structural integrity of the components is studied. In order to assess the real severity of the casting defects under mechanical loadings, an experimental program was carried out. It consisted of testing, under both cyclic and monotonic solicitations, three-point bend specimens containing either a natural defect (in the form of a localized cluster of cavities) or a machined notch having the dimensions of the cluster`s envelope. The tests are analyzed in order to develop a method that takes into account the behavior of castings defects in a more realistic fashion than by an envelope crack. Various approaches are investigated, including the search of equivalent defects or of criteria based on continuum mechanics concepts, and compared with literature data. This study shows the conservatism of current safety analyses in modelling casting defects by envelope semi-elliptical cracks and contributes to the development of alternative approaches. (author) 18 refs.}
place = {France}
year = {1997}
month = {Apr}
}