Abstract Cast duplex stainless steel piping in light water nuclear reactors expe- rience thermal aging embrittlement during operational service. Interest in extending the operational life to 80 years requires an increased understanding of the microstructural evolution and corresponding changes in mechanical behavior. We analyze the evolution of the microstructure during thermal aging of cast CF-3 and CF-8 stainless steels using electron microscopy and atom probe tomography. The evolution of the mechanical properties is measured concurrently by mechanical methods such as tensile tests, Charpy V-notch tests, and instrumented nanoinden- tation. A microstructure-based ?nite element method model is developed and uti- lized in conjunction with the characterization results in order to correlate the local stress-strain effects in the microstructure with the bulk measurements. This work is supported by the DOE Nuclear Energy University Programs (NEUP), contract number DE-NE0000724.
Revised: July 27, 2017 |
Published: February 5, 2017
Citation
Schwarm S.C., S.N. Mburu, R.P. Kolli, D.E. Perea, J. Liu, and S. Ankem. 2017.Mechanical and Microstructural Effects of Thermal Aging on Cast Duplex Stainless Steels by Experiement and Finite Element Method. In Mechanical and Creep Behavior of Advanced Materials: A SMD Symposium Honoring Professor K. Linga Murty, February 26-March 2, 2017, San Diego, California. The Minerals, Metals & Materials Series, edited by I Charit, et al, 253-262. Cham:Springer.PNNL-SA-124533.doi:10.1007/978-3-319-51097-2_20