The Laue back-reflection method for determination orientation and subgrains disorientation of blade manufacture single-crystal pieces

The technological production process for single-crystal turbine blades requires control of the crystallographic orientation in both manufactured blades, as well as in many auxiliary pieces. The Laue back-reflection method is the simplest and quickest method for these tasks. It is also the quickest and simplest method in terms of technical equipment requirements. The paper presents an original computerised method for processing back-reflection Laue images (epigrams) and a specialised, small table-top unit to determine the orientation of single-crystal objects, as well as disorientation between grains in the object. Comparative results using the Laue method and diffractometry method for testing single-crystal items made from heat-resistant metal alloys from four engine plants are presented.