EFFECTS OF HEAT TREATMENT AND HOT ISOSTATIC PRESSING ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Ti2AlNb-BASED ALLOY FABRICATED BY SLM

Abstract

Orthorhombic Ti2AlNb-based alloys are considered as promising materials for high-temperature applications in aero-engines due to their high yield strength, low-cycle fatigue, creep resistance. Additive manufacturing is a promising way of producing intermetallic alloy since it allows obtained complex-shaped parts without significant machining. At the same time, additive manufacturing of intermetallic alloys involves the use of high-temperature preheating and requires post-processing by hot isostatic pressing or heat treatment. In this paper, Ti2AlNb-based intermetallic alloy was fabricated by SLM process with a high-temperature substrate preheating and subjected to various heat treatments and hot isostatic pressing to study their effects on microstructure and properties of the alloy.