PROCEDURE FOR EVALUATION OF COATED REFRACTORY ALLOYS.
Rept. for Apr 61-30 May 62,
GENERAL ELECTRIC CO CINCINNATI OHIO
Pagination or Media Count:
Procedures for the evaluation of coated molybdenum and columbium alloys were investigated. A simple corrugated specimen was designed to determine the applicability of current coatings to a fabricated structure. Coated specimens were oxidation tested at 2500F up to 10 hours, and sectioned for metallographic examination and hardness determination. Dynamic oxidation tests were conducted using a gas-fired flame tunnel and a plasma test stand. Effects of the coatings and elevated temperature exposure on basis metal properties were established by combined stress, fatigue, and tensile tests. Coatings from six sources were investigated on the program. Based on the results obtained recommendations are made for the standardization of the applicability specimen and combined stress testing along with other mechanical tests for the evaluation of coated refractory metals. Author