Characterization of single crystal mechanical test specimens for advanced turbine applications

• Main Authors: Lipetzky, Kirsten G., Green, Robert E. Jr
• Format: Conference Proceeding
• Language: English
• Subjects: GRAIN BOUNDARIES; HEAT RESISTING ALLOYS; MATERIALS SCIENCE; MECHANICAL TESTS; MONOCRYSTALS; NICKEL BASE ALLOYS; NONDESTRUCTIVE TESTING; RAW MATERIALS; SILICON; SURFACES; TEXTURE; TURBINES; X-RAY DIFFRACTION
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/1.1302071

A series of fifteen mechanical test specimens made from a nickel-based superalloy were supplied by Siemens Westinghouse in order that Asymmetric Crystal Topography (ACT), an x-ray diffraction technique, be used to confirm which samples were single crystal samples and which samples contained low angle grain boundaries. It had been determined (by another investigator) prior to the manufacture of the mechanical test specimens, which 'raw' material contained low angle grain boundaries and which material was single crystalline in nature. Siemens Westinghouse requisitioned the production of mechanical test specimens from several manufacturers, with specific requirements that some of the samples were to be single crystalline and that other samples were to contain low angle grain boundaries within the gauge length. Once completed, Siemens Westinghouse wanted to confirm that the samples were properly manufactured and selected a representative portion of the mechanical test samples to be examined via ACT.