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Investigation of Thermal Aging Effects on the Evolution of Microstructure and
Mechanical Properties of Cast Duplex Stainless Steels


EMSL Project ID
49125

Abstract

This proposal spans a collaboration between EMSL and the University of Maryland under a Nuclear Energy University Program grant. The objectives of the proposed research project are to (1) develop a detailed understanding of relationships between microstructure and mechanical behavior in cast duplex stainless steels during isothermal aging, (2) establish correlations between isothermal aging response at accelerated aging temperatures and in-service aging temperatures, and (3) validate the use of accelerated aging temperatures to estimate response of in-service aging temperatures. These steels are used in primary water-cooling system piping of current light water reactors, which are approaching the end of their design life. These steels, however, are susceptible to thermal aging embrittlement during service at high temperatures. Interest in extending the service life of these reactors up to 80-years requires evaluating thermal aging effects on the microstructure, mechanical behavior and embrittlement mechanisms of these steels for durations beyond the design life. Through this proposal, I seek to use the unique capabilities and staff at EMSL, specifically atom probe tomography. EMSL staff time will be covered through a funded NEUP proposal.

Project Details

Start Date
2015-10-22
End Date
2016-09-30
Status
Closed

Team

Principal Investigator

Daniel Perea
Institution
Environmental Molecular Sciences Laboratory

Team Members

Vincent Ly
Institution
Pacific Northwest National Laboratory

Arielle Eaton
Institution
Environmental Molecular Sciences Laboratory

Shenyang Hu
Institution
Pacific Northwest National Laboratory

Karen Kruska
Institution
Pacific Northwest National Laboratory

Jia Liu
Institution
Environmental Molecular Sciences Laboratory

Yi Gu
Institution
Washington State University

Charles Henager
Institution
Pacific Northwest National Laboratory