9Cr steel weldments are concerned with evaluation of creep life time and creep rupture mechanism. In fine grain HAZ (FG-HAZ) of weldments, TYPE IV cracking and creep voids occurred at lower stress than rupture stress level of base metal. In the crept specimen, FG-HAZ sometime has large coarsening grains near creep voids. These recovery phenomena are localized in FG-HAZ, and recovered microstructures are dependent on heat input of welding. In this study, creep tests are examined in two types of weldments, and relations between creep life time and coarsened sub-grains or grains have been studied by microstructural changing with EBSP analysis. In crept specimens, boundaries are moved and boundary density is decreasing in the fine-grained HAZ. Maximum grain size and creep life time have linear function, and EBSP can evaluate creep life time of 9Cr weldments. These microstructural changing are considered by morphology of precipitates in the several crept specimens.
Skip Nav Destination
ASME 2007 Pressure Vessels and Piping Conference
July 22–26, 2007
San Antonio, Texas, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
0-7918-4287-8
PROCEEDINGS PAPER
Creep Damage Evaluation of Fine-Grained HAZ in Mod. 9Cr Ferritic Heat-Resistant Steel Weldments
N. Yoneyama,
N. Yoneyama
Ishikawajima-Harima Heavy Industries Company, Ltd., Yokohama, Japan
Search for other works by this author on:
K. Kubushiro,
K. Kubushiro
Ishikawajima-Harima Heavy Industries Company, Ltd., Yokohama, Japan
Search for other works by this author on:
H. Yoshizawa
H. Yoshizawa
Ishikawajima-Harima Heavy Industries Company, Ltd., Yokohama, Japan
Search for other works by this author on:
N. Yoneyama
Ishikawajima-Harima Heavy Industries Company, Ltd., Yokohama, Japan
K. Kubushiro
Ishikawajima-Harima Heavy Industries Company, Ltd., Yokohama, Japan
H. Yoshizawa
Ishikawajima-Harima Heavy Industries Company, Ltd., Yokohama, Japan
Paper No:
CREEP2007-26726, pp. 557-561; 5 pages
Published Online:
August 20, 2009
Citation
Yoneyama, N, Kubushiro, K, & Yoshizawa, H. "Creep Damage Evaluation of Fine-Grained HAZ in Mod. 9Cr Ferritic Heat-Resistant Steel Weldments." Proceedings of the ASME 2007 Pressure Vessels and Piping Conference. Volume 9: Eighth International Conference on Creep and Fatigue at Elevated Temperatures. San Antonio, Texas, USA. July 22–26, 2007. pp. 557-561. ASME. https://doi.org/10.1115/CREEP2007-26726
Download citation file:
6
Views
Related Proceedings Papers
Related Articles
Metallurgical Assessment of the Softened HAZ Region During Multipass Welding
J. Manuf. Sci. Eng (May,2000)
Influence of Service Exposure on Base and Weld Metal of 1/2 Cr-1/2 Mo-1/4 V High-Pressure Steam Inlet Piping
J. Pressure Vessel Technol (May,1982)
Evaluation of Creep Strength Reduction Factors for Welded Joints of Grade 122 Steel
J. Pressure Vessel Technol (April,2011)
Related Chapters
Materials and Their Weldability
A Quick Guide to Welding and Weld Inspection
Understanding the Problem
Design and Application of the Worm Gear
The Necessary Fine-Tuning of Process Management and Controls for Metallic Transformations during Manufacturing of Bearings: Application to M50NiL Steel
Bearing and Transmission Steels Technology