SYMPOSIA PAPER Published: 01 January 2003

Creep Crack Growth in the Base Metal and a Weld Joint of X20CrMoV 12 1 Steel Under Two-Step Loading


The creep crack growth behavior in the base metal and a weld joint of X20CrMo 12 1 steel has been investigated under two-step loading at 545°C using 1/2T CT specimens. The crack growth process has been simulated using finite element analyses to examine the transient crack tip field. The results are compared with those under constant loading. In step-up loading, crack growth accelerated greatly after load change due to the effect of prior creep damage and reduced stress relaxation. In step-down loading, further creep-damage at the crack tip nearly ceased after load change due to a sharp drop in crack tip stress, leading to crack arrest for a substantial period of time. Crack growth eventually resumed as the crack tip stress increased by redistribution of the creep strain. Crack growth rates are found to correlate well with C*(t) for both base metal and weld specimens.

Author Information

Kim, KS
Pohang University of Science and Technology, Pohang, Korea
Lee, NW
Hyundai Motor Company, Kyunggi-do, Korea
Chung, YK
Research and Development Center, Korea Heavy Industries & Construction Co., Ltd., Changwon, Korea
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Developed by Committee: E08
Pages: 407–424
DOI: 10.1520/STP11086S
ISBN-EB: 978-0-8031-5472-8
ISBN-13: 978-0-8031-2899-6