Paper Title:
Evaluation of DBTT and Creep Properties of Aged Main Valve Casing by Using Small Punch Specimens
  Abstract

Both the change in DBTT and the degradation of creep properties of the aged CrMoV cast steel which had been actually used as a main steam valve were evaluated from the conventional SP test and the SP creep (SP-C) test using by SP test specimens. The CVN DBTTs of the virgin and aged steels were estimated to be 280 and 369 K by the conventional SP test, respectively. This increase in DBTT after the long-term service exposure was considered to be caused by carbide-induced embrittlement due to coarse carbides. The SP-C test results revealed that the creep rupture strength of the aged steel was inferior to that of the virgin steel. The ratio, F / s , between the load of the SP-C test (F) and the stress of the uniaxial test ( s) was determined to be 2.4 for the same value of the Larson-Miller parameter in the creep rupture data. This linear relationship enables us to convert the results of the SP-C test into those corresponding to a conventional uniaxial creep test. Consequently, the SP testing method is expected to be appropriate tool for the determination of material deterioration and, in turn, the assessment of remaining-life of high-temperature components.

  Info
Periodical
Key Engineering Materials (Volumes 297-300)
Edited by
Young-Jin Kim, Dong-Ho Bae and Yun-Jae Kim
Pages
1470-1476
DOI
10.4028/www.scientific.net/KEM.297-300.1470
Citation
T. Sugimoto, S. Komazaki, T. Misawa, "Evaluation of DBTT and Creep Properties of Aged Main Valve Casing by Using Small Punch Specimens ", Key Engineering Materials, Vols. 297-300, pp. 1470-1476, 2005
Online since
November 2005
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Y.K. Chung, Jong Jin Park, Cheol Hong Joo, Ik Min Park
Abstract:X20CrMoV12 1 steels were exposed at three different high temperatures and various durations. Aging parameter, LMP s, was used to...
537
Authors: Bum Joon Kim, Byeong Soo Lim
Abstract:In this study, the crack growth behavior in P92 steel (9%Cr-2%W) weldment was investigated at 600ı under the load of trapezoidal wave shape...
4211
Authors: Vàclav Sklenička, Květa Kuchařová, Milan Svoboda, Ivan Saxl
Abstract:Critical high temperature components of machines and structures are often subjected to complicated load and temperature histories. The...
81
Authors: Jürgen Malzbender, G. Pećanac, Stefan Baumann
Abstract:Ba0.5Sr0.5Co0.8Fe0.2O3 – δ is a mixed ion-electron conductor with high...
303
Authors: Bin Lin, Zhi Bo Chen, Tao Ma
Chapter 6: Geotechnical Engineering and Underground Space Structure
Abstract:The test study the creep property of artificial frozen clay at different frozen temperature by independently developed uniaxial creep testing...
2634