Characterization of Creep Resistance for Local Structure of Power Plant Weldment Using SP-Creep Technique


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Power plant weldments are composed of various microstructures. Due to welding and PWHT processes, the microstructure of the base metal adjacent to fusion line is transformed into entirely different microstructures, collectively known as heat affected zone (HAZ). Creep, on the other hand, is considered as the most important deterioration mechanism of heat resistant components found in power plants. Therefore it is essential to evaluate creep properties of HAZ, which is considered to be very hazardous in weldment. Recently, most of the creep tests for HAZ are conducted using cross weld type specimen. However there are some problems with this type of creep test due to the results being largely varied according to the volume fraction of HAZ. In this paper, SP-Creep test, which has confirmed the availability for creep properties evaluation, has been conducted on each of the weldment microstructures. The results showed that each microstructure has a different creep behavior. The overall creep properties of HAZ are worse than those of the weld metal. Among the HAZ structures, fine grained HAZ has the worst creep properties.



Key Engineering Materials (Volumes 326-328)

Edited by:

Soon-Bok Lee and Yun-Jae Kim




S. S. Baek et al., "Characterization of Creep Resistance for Local Structure of Power Plant Weldment Using SP-Creep Technique", Key Engineering Materials, Vols. 326-328, pp. 643-648, 2006

Online since:

December 2006




[1] R. Viswanathan and S.M. Gehl: Life-Assessment Technology for Power-Plant Components, JOM Feb (1992), p.34~42.

[2] G.A. Webster and R.A. Ainsworth: High Temperature Component Life Assessment, CHAPMAN & HALL (1993).

[3] R. Viswanathan : Damage Mechanisms and Life Assessment of High Temperature Components, ASM International Metals Park (1993), p.206~208.

[4] R. Singh and S.R. Singh: Remaining Creep Life Study of Cr-Mo-V Main Steam Pipe Lines, Int. J. Pres. & Piping 73 (1997), p.89~95.


[5] J. Cadek and V. Susteck: An Analysis of a Set of Creep Data for a 9Cr-1Mo-0. 2V(P91 type) Steel, Materials Science and Engineering A225 (1997), p.22~28.

[6] Y. Muramatzu, M. Yamazaki, H. Hongo, and Y. Monma: Size and Shape Effects of Welded Joint Specimen on Creep Behavior, Pressure Vessel Technology I, Proc. ICPVT 7 (1992), pp.737-747.

[7] J. Storesund and S.T. Tu: Geometrical Effect on Creep in Cross Weld Specimens, Int. J. Pressure Vessel & Piping 62 (1995), p.179~193.


[8] S.S. Baek, S.H. Na, E.G. Na and H.S. Yu: Development of Evaluation Technique of High Temperature Creep Characteristics by Small Punch-Creep Test Method, Transactions of the KSME Vol. 25-12 (2001), p.1995~(2001).

[9] X. Mao, T. Shoji, and H. Takahashi: Characterization of Fracture Behavior in Small Punch Test by Combined Recrystallization-Etch Method and Rigid Plastic Analysis, J. Testing and Evaluation (1987), p.30~37.