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Correlation of the microstructure and fracture toughness of the heat-affected zones of an SA 508 steel

Title
Correlation of the microstructure and fracture toughness of the heat-affected zones of an SA 508 steel
Authors
Kim, SKang, SYOh, SJKwon, SJLee, SKim, JHHong, JH
POSTECH Authors
Kwon, SJLee, S
Date Issued
Jan-2000
Publisher
MINERALS METALS MATERIALS SOC
Abstract
In this study, microstructures of a heat-affected zone (HAZ) of an SA 508 steel were identified by Mossbauer spectroscopy in conjunction with microscopic observations, and were correlated with fracture toughness. Specimens with the peak temperature raised to 1350 degrees C showed mostly martensite. With the peak temperature raised to 900 degrees C, the martensite fraction was reduced, while bainite or martensite islands were formed because of the slow cooling from the lower austenite region and the increase in the prior austenite grain size. As the martensite fraction present inside the HAZ increased, hardness and strength tended to increase, whereas fracture toughness decreased. The microstructures were not changed much from the base metal because of the minor tempering effect when it was raised to 650 degrees C or 700 degrees C. However, fracture toughness of the subcritical HAZ with the peak temperature raised to 650 degrees C to 700 degrees C was seriously reduced after postweld heat treatment (PWHT) because carbide particles were of primary importance in initiating voids. Thus, the most important microstructural factors affecting fracture toughness were the martensite fraction before PWHT and the carbide fraction after PWHT.
URI
http://oasis.postech.ac.kr/handle/2014.oak/20037
ISSN
1073-5623
Article Type
Article
Citation
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, vol. 31, no. 4, page. 1107 - 1119, 2000-01
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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