Investigation of Thermal Aging Effects on the Evolution of Microstructure and
Mechanical Properties of Cast Duplex Stainless Steels
EMSL Project ID
49647
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
2016-10-06
End Date
2017-09-30
Status
Closed
Released Data Link
Team
Principal Investigator
Related Publications
Mburu S, RP Kolli, DE Perea, SC Schwarm, AM Eaton, J Liu, S Patel, JAG Bartrand, and S Ankem. 2017. "Effect of Aging Temperature on Phase Decomposition and Mechanical Properties in Cast Duplex Stainless Steels." Materials Science and Engineering. A. Structural Materials: Properties, Microstructure and Processing 690:365-375. doi:10.1016/j.msea.2017.03.011