Conferences

STRUCTURAL DEFECTS OF INITIAL CRYSTALLIZATION AREAS IN SINGLE-CRYSTALLINE TURBINE BLADES

J.Krawczyk,
 
A.Tondos,
 
W.Bogdanowicz,
 
R.Paszkowski
 

Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2017, #07/08
http://www.materials.kiev.ua/article/2415

Abstract

The as-cast single-crystalline turbine blades made of CMSX-4 superalloy were studied. The blades were obtained by the Bridgman technique at a withdrawal rate of 5mm/min. The as-cast samples were prepared by cutting the blade root with a fragment of selector. The dendritic structure of obtained samples was studied by Scanning Electron Microscopy. The crystal orientation and lattice parameters were analyzed by Ω-scan mapping method. Additionally, the X-ray diffraction topography was applied. It was found that the most structural defects are created in the areas where a change in the shape and dimensions of the blades occur. Even minor changes in their geometry and the unevenness of mold walls may also affect the formation of defects.


CMSX-4 SUPERALLOY, SINGLE-CRYSTALLINE TURBINE BLADES, STRUCTURAL EFFECTS, X-RAY TOPOGRAPHY