NICKEL BASE SUPERALLOYS USED FOR AERO ENGINE TURBINE BLADES | ||
| The International Conference on Applied Mechanics and Mechanical Engineering | ||
| Article 22, Volume 16, 16th International Conference on Applied Mechanics and Mechanical Engineering., May 2014, Pages 1-22 PDF (1.41 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/amme.2014.35549 | ||
| Authors | ||
| A. M. Morad1; Y. M. Shash2 | ||
| 1Egyptian Armed Forces. | ||
| 2Professor, faculty of engineering, Cairo university, Giza, Egypt. | ||
| Abstract | ||
| ABSTRACT Nickel base Superalloys service at high temperatures, particularly in the hot zones of gas turbine engine. These materials allow the turbine to operate more efficiently by withstanding higher temperatures. Turbine Inlet Temperature (TIT) depends on the temperature capability of first stage high-pressure turbine blade made of nickel base superalloys exclusively. Single crystal Nickel base turbine blade is free from g/ g¢ grain boundaries; boundaries are easy diffusion paths and therefore reduce the resistance of the material to creep deformation. Experimental investigation carried out by using Different scrap of turbine blades with different chemical compositions were melted aiming to control the chemical composition of the product alloy, leading to a steel alloy called iron base superalloy with nickel content (24.3%) and chromium content (13.2%) this new alloy has almost the same mechanical properties of nickel base superalloy of higher price. This new alloy can be used for production of turbine blades for small gas turbine engines less than 200 KW. Solidification behavior of stepped cast specimen of nickel base superalloy was studded by using three different cast thicknesses size. The results and conclusion of this work show that the higher the cooling rate is the better the mechanical properties. The results also show that the increase of cobalt and titanium contents of nickel base alloy from 1.08 & 9.31 and 2.68 & 10.78 respectively leads to an increase in ultimate tensile strength, yield strength and hardness. Microstructure investigation of nickel base superalloys was conducted on all samples, the results show the continuous matrix (g) and the primary strengthening phase (g¢), the microstructure change from dendrite structure to a fine cellular one by increasing titanium percent content. | ||
| Keywords | ||
| Superalloys; Nickel base Superalloys; Turbine blades; Single crystal turbine blades | ||
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