CREEP-FATIGUE LIFE EVALUATION FOR WELDMENTS OF MODIFIED 9CR-1MO STEELAT BOILER TEMPERATURES

Authors
NONAKA I TORIHATA S KIHARA S UMAKI H
Citation
I. Nonaka et al., CREEP-FATIGUE LIFE EVALUATION FOR WELDMENTS OF MODIFIED 9CR-1MO STEELAT BOILER TEMPERATURES, Materials at high temperatures, 15(2), 1998, pp. 69-73
Citations number
3
Categorie Soggetti
Material Science
Journal title
Materials at high temperatures → ACNP
ISSN journal
09603409
Volume
15
Issue
2
Year of publication
1998
Pages
69 - 73
Database
ISI
SICI code
0960-3409(1998)15:2<69:CLEFWO>2.0.ZU;2-U
Abstract
Creep-fatigue tests were conducted to verify long-term structural inte grity for weldments of modified 9Cr-1Mo steel at boiler plants. As a r esult, it was proved that the weldments were fractured mainly at the H AZ and the fatigue lives were reduced by strain hold. This appeared to be due to acceleration of crack initiation by creep strain concentrat ion and acceleration of crack growth by void generation in the HAZ. A method for predicting the life is proposed based on the fracture mecha nism, and its accuracy was confirmed to be within a factor of two.