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

N Koshizuka; T Enami; M Tanaka; T Hiro; Y Kusuhara; S Yoshimura; H Fukuda

doi:10.1520/STP18397S

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

Source

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

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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