Paper Title:
Creep Behaviors of Nickel-Based Single Crystal Superalloys Compact Tension Specimen at High Temperature
  Abstract

Based on the microstructure change and damage characteristics of single crystal, a two-state-variable crystallographic creep damage constitutive model has been developed to investigate crack growth behaviors of single crystal compact tension specimen at 760 for two crack orientations: (001)[100] and (011)[100]. Numerical simulation results show the crack-tip stress fields are dependent on crack crystallographic orientation. Observations performed on the real single crystal specimens reveals that the macroscopic crack growth path appears as zigzag wave. The creep deformation at crack tip takes place in specific slip plane, and the deflection angles of crack initiation direction from the crack plane are 45º or 135 º and 53.7ºor 127.3º in the crack orientations (001)[100] and (011)[100]. A good agreement between experimental observations and numerical results is found.

  Info
Periodical
Advanced Materials Research (Volumes 146-147)
Edited by
Sihai Jiao, Zhengyi Jiang and Jinglong Bu
Pages
1322-1326
DOI
10.4028/www.scientific.net/AMR.146-147.1322
Citation
Z. X. Wen, N. X. Hou, Z. F. Yue, "Creep Behaviors of Nickel-Based Single Crystal Superalloys Compact Tension Specimen at High Temperature", Advanced Materials Research, Vols. 146-147, pp. 1322-1326, 2011
Online since
October 2010
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