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Effect of the Out-of-Plane Constraint on Creep Crack Growth Property of Cr-Mo-V Type Steel

[+] Author Affiliations
Jian-Ping Tan, Guo-Zhen Wang, Fu-Zhen Xuan, Shan-Tung Tu, Zheng-Dong Wang

East China University of Science and Technology, Shanghai, China

Paper No. PVP2011-57300, pp. 237-246; 10 pages
doi:10.1115/PVP2011-57300
From:
  • ASME 2011 Pressure Vessels and Piping Conference
  • Volume 5: High-Pressure Technology; Nondestructive Evaluation; Nuclear Engineering
  • Baltimore, Maryland, USA, July 17–21, 2011
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-4455-7
  • Copyright © 2011 by ASME

abstract

In order to establish an accurate integrity assessment of structures containing defects at high temperature, it is necessary to clarify the constraint effect on creep crack growth (CCG) property. However, the effect of the out-of-plane creep constraint induced by the specimen thicknesses has been little studied. In this study, the CCG properties and fracture mechanism of Cr-Mo-V type steel at 566°C were investigated by using the compact tension specimens with different thicknesses. The results show that the data of the CCG rate da/dt versus C* lie within a relatively tight scatter band on log-log scale for the specimens with different thicknesses at higher values of C*. In addition, the differences of CCG rate becomes large with C* decreasing. It means that the effect of out-of-plane constraint on CCG rate is dependent on the load level (C*). The reason for the similar CCG rate is that the creep damage and fracture mechanism of void growth at grain boundary ahead of crack tips in the specimens with different thicknesses does not essentially change. The size rc of the creep damage and fracture process zone in front of crack tips is related to the specimen thickness, and the damage rate fields over the process zone are similar for the specimens with different thicknesses. The deformation near the crack tip obscures the constraint effect. Based on a reference stress field under plane strain state and the creep process zone rc , in-plane and out-of-plane constraint parameter Rd and Td were defined and the creep crack-tip constraint effect induced by specimen thickness were quantitatively examined. The factors of creep time and load level (C*) influencing the constraint effect were analyzed.

Copyright © 2011 by ASME

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