Document Type

Report

Publication Date

3-24-2002

Abstract

The objective of this task is to evaluate the elevated temperature tensile properties of Alloy EP-823, a leading target material for accelerator-driven waste transmutation applications. The test material will be thermally treated prior to evaluation of its tensile properties at temperatures relevant to the transmutation applications. The deformation characteristics of tensile specimens, upon completion of testing, will be evaluated by surface analytical techniques including scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The overall results are expected to provide a mechanistic understanding of high-temperature deformation behavior of Alloy EP-823 as a function of heat treatment.

Highlights of Accomplishment

• Three experimental heats of EP-823 martensitic stainless steel have been melted, and processed into round bars at the Timken Company, Canton, Ohio. One heat of this material has been heat 2 treated (quenched and tempered) to produce fully tempered martensitic microstructure, typical of a martensitic stainless steel. Hardness measurements have also been performed (≈30 Rc). Efforts are well underway to machine tensile specimens from these heat-treated bars.

• The high-temperature and inert gas chamber with extension rod assembly and system software, that were ordered during this past quarter to perform high-temperature mechanical testing of Alloy EP-823 using an existing MTS machine, is expected to arrive at UNLV during April/May 2002 timeframe. Meanwhile, ambient-temperature tensile data will be generated as the machined test specimens of Alloy EP-823 become available.

• Round wedges for specimen grips in the MTS equipment have been ordered to facilitate the tensile testing using the inert gas chamber.

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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