TY - JOUR
T1 - The characterization of creep crack growth rate and its life of TiAl inter-metallic compound with full lamellar microstructure
AU - Yokobori, A. Toshimitsu
AU - Satoh, Tsuyoshi
AU - Shibata, Masayuki
AU - Tabuchi, Masaaki
AU - Fuji, Akio
AU - Yokobori, Takeo
N1 - Funding Information:
Thanks showed be made for financial aid to the Japan Society for Promotion of Science (JSPS) of the RFTF program 97R12101 and also to the JSPS 129 Project, including the support of VAMAS activities. Part of work was also supported by the Grant-in Aid for COE Research (No.11CE2003),The Ministry of Education, Science, Sports and Culture.
PY - 2001
Y1 - 2001
N2 - TiAl inter-metallic compound is considered to be an effective material for high temperature structural materials. Since, this material is considered to be a creep brittle like material, it is necessary to construct the prediction law for the life of creep crack growth. The introduction of a fatigue pre-crack was found to be difficult due to material structure. Therefore, the validity of using a sharp-notched specimen (machined or EDM) instead of a fatigue pre-cracked specimen to perform creep crack growth rate test (CCGR test) has been proposed. In this paper, creep crack growth tests were conducted for this material using CT specimens with a sharp notch. On the basis of a thermally activated process, CCGR of TiAl inter-metallic compound with full lamellar microstructure was characterized in terms of temperature and stress component and Q* parameter for this material is derived. Furthermore, the algorithm of predicting the life of creep crack growth based on the Q* parameter was derived. This equation was found to well predict the life of creep crack growth.
AB - TiAl inter-metallic compound is considered to be an effective material for high temperature structural materials. Since, this material is considered to be a creep brittle like material, it is necessary to construct the prediction law for the life of creep crack growth. The introduction of a fatigue pre-crack was found to be difficult due to material structure. Therefore, the validity of using a sharp-notched specimen (machined or EDM) instead of a fatigue pre-cracked specimen to perform creep crack growth rate test (CCGR test) has been proposed. In this paper, creep crack growth tests were conducted for this material using CT specimens with a sharp notch. On the basis of a thermally activated process, CCGR of TiAl inter-metallic compound with full lamellar microstructure was characterized in terms of temperature and stress component and Q* parameter for this material is derived. Furthermore, the algorithm of predicting the life of creep crack growth based on the Q* parameter was derived. This equation was found to well predict the life of creep crack growth.
KW - Creep crack growth rate
KW - Full lamellar structure
KW - Sharp-notched specimen
KW - The life of creep crack growth
KW - TiAl inter-metallic compound
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U2 - 10.1016/s0308-0161(01)00087-4
DO - 10.1016/s0308-0161(01)00087-4
M3 - Article
AN - SCOPUS:11144271224
VL - 78
SP - 757
EP - 764
JO - International Journal of Pressure Vessels and Piping
JF - International Journal of Pressure Vessels and Piping
SN - 0308-0161
IS - 11-12
ER -