The characterization of creep crack growth rate and its life of Cast TiAl-Fe-V-B Alloys(Strength & Fracture)

Abstract

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 law of prediction of the life of creep crack growth. Furthermore, there are several types of TiAl with various microstructure such as full lamellar, duplex and γ-base TiAl. Therefore, it is necessary what type of TiAl is more suitable for practical application. In this paper, the characteristics of creep crack growth rate and its life for Near Gamma Cast TiAl-Fe-V-B alloys with lamellar structure were investigated and they were compared with those for full lamellar TiAl with large grain size.