SYMPOSIA PAPER Published: 01 January 1986
STP18397S

Effect of the Heat-Affected Zone at the Crack-Starter Bead on the Nil-Ductility Transition Temperature of Steels Determined by the Drop-Weight Test

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The effect of the heat-affected zone (HAZ) at the crack-starter bead on the nil-ductility transition temperature (NDTT) of drop-weight test specimens of pressure vessel steels was investigated. NDTT varied with changes in thermal cycles in the bead welding and increased linearly with the hardness of HAZ. Using fracture toughness of the base metal and HAZ geometry, NDTT was estimated and compared with the observed NDTT. The difference between the estimated NDTT and the observed NDTT was caused by changes in HAZ hardness. The observed NDTT became lower with softening of HAZ.

Author Information

Koshizuka, N
Kawasaki Steel Corp., Kurashiki, Japan
Enami, T
Kawasaki Steel Corp., Kurashiki, Japan
Tanaka, M
Kawasaki Steel Corp., Kurashiki, Japan
Hiro, T
Kawasaki Steel Corp., Kurashiki, Japan
Kusuhara, Y
Mizushima Works, Kawasaki Steel Corp., Kurashiki, Japan
Fukuda, H
New York Office, Kawasaki Steel America Inc., New York, NY
Yoshimura, S
Mizushima Works, Kawasaki Steel Corp., Kurashiki, Japan
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Details
Developed by Committee: E28
Pages: 69–86
DOI: 10.1520/STP18397S
ISBN-EB: 978-0-8031-4984-7
ISBN-13: 978-0-8031-0487-7