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Effect of carbide distribution on the fracture toughness in the transition temperature region of an SA 508 steel SCIE SCOPUS

Title
Effect of carbide distribution on the fracture toughness in the transition temperature region of an SA 508 steel
Authors
Lee, SKim, SHwang, BLee, BSLee, CG
Date Issued
2002-11-14
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Abstract
An investigation was conducted into the effect of carbide distribution on fracture toughness in the ductile-brittle transition temperature region of an SA 508 steel used for nuclear reactor pressure vessels. Tensile properties and elastic-plastic cleavage fracture toughness were measured in the transition temperature region, and the fracture toughness data were interpreted by using a simple fracture model containing carbide size distribution. This modeling study indicated that the critical nearest-neighbor distance between coarse carbides was an important microstructural factor affecting elastic-plastic fracture toughness, since it satisfied a linear relationship with the critical distance between a crack tip to a cleavage initiation site. These findings suggested that reducing the total number of carbides, particularly the number of M2C carbides larger than the critical size, and homogeneously distributing fine M2C carbides, were useful ways to improve fracture toughness in the transition temperature region. (C) 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.
Keywords
SA508 steel; ASTM E1921 standard test method; carbide distribution; transition region; MN WELD METAL; CLEAVAGE FRACTURE; MICROSTRUCTURE; EMBRITTLEMENT; STRAIN; STRESS
URI
https://oasis.postech.ac.kr/handle/2014.oak/18831
DOI
10.1016/S1359-6454(02)00313-0
ISSN
1359-6454
Article Type
Article
Citation
ACTA MATERIALIA, vol. 50, no. 19, page. 4755 - 4762, 2002-11-14
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이성학LEE, SUNG HAK
Dept of Materials Science & Enginrg
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