Document Type

Report

Publication Date

10-30-2003

Abstract

The purpose of this project is to evaluate the elevated temperature tensile properties of Alloy EP-823, a leading target material for accelerator-driven waste transmutation applications. This Alloy has been proven to be an excellent structural material to contain the 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 Alloy. The test material will be thermally treated prior to the 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 using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The overall results will lead to the development of a mechanistic understanding of the elevated-temperature deformation processes in this Alloy as a function of thermal treatment. The resultant data may also provide guidance in developing future target materials possessing the improved metallurgical properties, and enhanced LBE corrosion resistance.

Accomplishments

• Temperature profiles have been developed to determine the times needed to achieve the desired test temperature, as a part of the furnace calibration process.

• Testing has been performed at ambient temperature, 1000C and 3000C using tensile specimens fabricated from vacuum-melted and heat-treated (at the Timken Company, OH) bars of martensitic Alloy EP-823 (heat number 2054 and different tempering times). Preliminary data indicate that both the yield strength (YS) and the ultimate tensile strength (UTS) of the tested material were slightly reduced at the elevated temperatures. However, no significant reduction in ductility in terms of percent elongation (%El) and percent reduction in area (%RA) was observed in these tests.

● Performed thermal treatments of Alloys EP-823 and HT-9 of different heats (2056 and 2048 respectively). Test specimens are being fabricated.

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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