Document Type

Annual Report

Publication Date

10-28-2003

Abstract

The purpose of this project is to evaluate the elevated temperature tensile properties of Alloy EP-823, a leading structural target material for accelerator-driven waste transmutation applications. This alloy has been proven to be an excellent structural material to contain the molten lead-bismuth-eutectic (LBE) nuclear coolant needed for fast spectrum operations. Very little data exist in the open literature on the tensile properties of this martensitic alloy. Three different heats of this material, produced by vacuum induction melting, were thermally treated to produce fully-tempered martensitic microstructure without any retained austenite (Table I). Cylindrical specimens were fabricated from the heat-treated round bars to evaluate the tensile properties at temperatures relevant to the transmutation applications. Testing so far has been performed at ambient temperature, 100, 300 and 400oC in the presence of nitrogen. Additional tensile testing will be conducted at 500 and 600oC. The deformation characteristics of all specimens, upon completion of their testing, will be analyzed by surface analytical techniques including scanning electron microscopy (SEM) and transmission electron microscopy (TEM). It is anticipated that the resultant testing data will lead to the development of a mechanistic understanding of the elevated temperature deformation processes as a function of thermal treatment in all three heats of Alloy EP-823. Further, these results may provide guidance in developing other materials possessing the improved metallurgical and corrosion properties for LBE applications.

Keywords

Accelerator-driven systems; Alloy EP-823; Deformations (Mechanics); Metals — Effect of high temperatures on; Nuclear reactors — Materials — Testing; Martensitic stainless steel — Ductility; Strength of materials

Disciplines

Materials Science and Engineering | Metallurgy | Nuclear Engineering | Oil, Gas, and Energy

Language

English


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