Hardness of Carburized Surfaces in 316LN Stainless Steel after Low Temperature Neutron Irradiation

Byun, TS

Oak Ridge National Laboratory

关键词: Hardening;    Supersaturation;    Irradiation;    Stainless Steels;    36 Materials Science;   

DOI  :  10.2172/885939
RP-ID  :  ORNL/TM-2005/5
RP-ID  :  DE-AC05-00OR22725
RP-ID  :  885939

美国|英语

来源: UNT Digital Library

【 摘 要 】

A proprietary surface carburization treatment is being considered to minimize possible cavitation pitting of the inner surfaces of the stainless steel target vessel of the SNS. The treatment gives a large supersaturation of carbon in the surface layers and causes substantial hardening of the surface. To answer the question of whether such a hardened layer will remain hard and stable during neutron irradiation, specimens of the candidate materials were irradiated in the High Flux Isotope Reactor (HFIR) to an atomic displacement level of 1 dpa. Considerable radiation hardening occurred in annealed 316LN stainless steel and 20% cold rolled 316LN stainless steel, and lesser radiation hardening in Kolsterised layers on these materials. These observations coupled with optical microscopy examinations indicate that the carbon-supersaturated layers did not suffer radiation-induced decomposition and softening.