Structure and mechanical properties of improved cast stainless steels for nuclear applications

Kenik, Edward A.; Busby, Jeremy T.; Gussev, Maxim N.; Maziasz, Philip J.; Hoelzer, David T.; Rowcliffe, Arthur F.; Vitek, John M.

doi:10.1016/j.jnucmat.2016.10.045

Title: Structure and mechanical properties of improved cast stainless steels for nuclear applications

Journal Article · Thu Oct 27 00:00:00 EDT 2016 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2016.10.045· OSTI ID:1362206

Kenik, Edward A. ^[1]; Busby, Jeremy T. ^[1]; Gussev, Maxim N. ^[2]; Maziasz, Philip J. ^[1]; Hoelzer, David T. ^[1]; Rowcliffe, Arthur F. ^[1]; Vitek, John M. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Nuclear Fuel and Isotopes Division

Casting of stainless steels is a promising and cost saving way of directly producing large and complex structures, such a shield modules or divertors for the ITER. Here, a series of modified high-nitrogen cast steels has been developed and characterized. The steels, based on the cast equivalent of 316 composition, have increased N (0.14-0.36%) and Mn (2-5.1%) content; copper was added to one of the heats. Mechanical tests were conducted with non-irradiated and neutron irradiated specimens at 0.7 dpa. It was established that alloying by nitrogen significantly improves the yield stress of non-irradiated steels and the deformation hardening rate. Manganese tended to decrease yield stress, but increased radiation hardening. Furthermore, the role of copper on mechanical properties was negligibly small. Analysis of structure was conducted using SEM-EDS and the nature and compositions of the second phases and inclusions were analyzed in detail. We show that the modified steels, compared to reference material, exhibit significantly reduced elemental inhomogeneity and second phase formation.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Joint Institute for Computational Sciences (JICS)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1362206

Alternate ID(s):: OSTI ID: 1396838

Journal Information:: Journal of Nuclear Materials, Vol. 483, Issue C; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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