DEVELOPMENT - AND CHARACTERISATION OF Ni-RASED ODS SUPERALLOY FOR HIGH TEMPERATURE APPLICATION

Abstract

Fabrication of Advanced Engineering Materials is one of the most progressive work in Research and Development of Metallurgy and Materials Engineering. Powder Metallurgy route is one of the preferable advanced manufacturing route to develop high temperature alloys with ODS strengthening technique. ODS alloys attract great attention as advanced high temperature materials, because they retain useful strength up to relatively high fractions of their melting points. Presently, ODS alloys are often produced through Mechanical Alloying (MA) via the P/M route with extrusion or hot isostatic pressing and are known for ,their excellent high temperature strength and excellent resistance to Oxidation and Hot corrosion. An in-depth analysis of the literature and state of the art technology on high temperature materials revealed that a considerable scope exist in developing ODS alloys provided low cost raw materials could be utilized. Ni-base ODS superalloys produced by mechanical alloying process (ex:- INCONEL MA 754) produced by extrusion technique have been used as a turbine vane alloy in advanced Jet engines produced. In our present work encapsulated powder has been forged and _ thermo mechanically treated with hot rolling technique as in conventional P/M route. The powder with wide range of size variation and non reduced environment has not shown much effect on high temperature oxidation resistance. The final alloys thus developed compare favorably with Inconel MA 754 in oxidation and cyclic oxidation resistance. On the basis of oxidation resistance result, it can be conclude that alloys developed through a combination of P/M and forging technique result in extremely good oxidation resistance. This new technique highlighted in the present investigation opens up entirely new area for the economical production of all types of ODS alloys.