Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Castability and Anisotropical High Temperature Strength of Directionally Solidified Ni-base Superalloys
Yoshio OHTAHiroshi HATTORIYukiya G. NAKAGAWAMichio YAMAZAKI
Author information
JOURNALS FREE ACCESS

1989 Volume 75 Issue 6 Pages 956-963

Details
Abstract

A ten-year R & D program to develop advanced gas turbines had been carried out by Agency of Industrial Science and Technology, government research institutions, and Engineering Research Association for Gas Turbines. The ultimate thermal efficiency to be attained in a combined cycle plant was 55% (LHV), for which a high pressure turbine was operated at the gas temperature up to 1400°C. One of the elements to bear this burden was the application of new turbin blade materials with columnar grained structure made through directional solidification (DS). A DS alloy TMD-5 was developed in the advanced turbine program in which:
(1) DS castability experiments were conducted for the alloy development to obtain blades with complex internal channel for cooling, and it was concluded that the γ' precipitate volume should be at about 58% balanced with optimized mechanical properties.
(2) Various mechanical properties such as tensile strength, creep strength, high cycle and thermal fatigue strength and physical properties of TMD-5 were tested, and found to be superior to those of a commercialy available DS alloy with the equivalent degree of anisotropy.

Information related to the author
© The Iron and Steel Institute of Japan
Previous article Next article
feedback
Top