Mechanical Properties, Oxidation Characteristics, and Weldability of Two Uncoated and Coated Vanadium-Base Alloys

Abstract : An experimental investigation was made to evaluate two vanadium-base sheet alloys for aerospace applications in the 1,800 F to 2,400 F (1,260 K to l,590 K) temperature range. The investigation consisted of mechanical property tests both at room and elevated temperatures and oxidation tests on coated and uncoated material. Three silicide diffusion coatings were evaluated by continuous and cyclic oxidation testing to determine their protective qualities. An X-ray study, a metallographic examination, and hardness measurements were made to identify and locate the elements and compounds present in the coating and substrate before and after elevated-temperature exposure. Fabrication and joining of the alloys are discussed. A description of the equipment and procedures utilized in performing the evaluation tests is included.