Metallurgical factors on toughness in intercritically reheated HAZ of low-C low-alloy steel

Conference · Fri Dec 30 23:00:00 EST 1994

OSTI ID:433627

Shiwaku, Toyoaki; Kobayashi, Yoichiro; Shimizu, Masato ^[1]; Toyoda, Masao; Minami, Fumiyoshi ^[2]

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1. Kobe Steel Ltd., Kakogawa (Japan)
2. Osaka Univ. (Japan)

Metallurgical factors on toughness in heat affected zone (HAZ) intercritically reheated between Ac1 and Ac3 were studied by welding thermal cycle simulation, because intercritically reheated HAZ has been, in general, recognized to be especially embrittled region in a multi-pass welded joint. The toughness of intercritical HAZ (ICHAZ) deteriorated with increasing cooling rate, while the toughness of intercritically reheated coarse grain HAZ (ICCGHAZ) deteriorated with decreasing cooling rate. It is found that the dominant metallurgical factor on toughness of ICHAZ is martensite-austenite (M-A) constituent, but those of ICCGHAZ are both M-A constituent and effective grain size depending on prior microstructure of ICCGHAZ.

• OSTI ID: 433627
• Report Number(s): CONF-940409--; ISBN 1-880653-10-9
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
42 ENGINEERING
FRACTURE PROPERTIES
HEAT AFFECTED ZONE
LOW ALLOY STEELS
MATERIALS TESTING
MICROSTRUCTURE
OFFSHORE PLATFORMS
WELDED JOINTS