Heat treatment effects on toughness of 9Cr-1MoVNb and 12Cr-1MoVW steels irradiated at 365°C

Conference · Sun Nov 17 00:00:00 EST 1991 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/0022-3115(92)90602-H· OSTI ID:10115547

Klueh, R. L. ^[1]; Alexander, D. J. ^[1]

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1. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

The 9Cr-1MoVNb and 12Cr-1MoVW steels were austenitized at 1040 and 1100°C to produce different prior austenite grain sizes, after which they were given different tempering treatments (1 h at 760 or 2.5 h at 780°C). Subsize Charpy impact specimens from these materials were irradiated at 365°C up to 5 dpa. For 9Cr-1MoVNb steel in the unirradiated condition, the smaller the prior austenite grain size and the higher the tempering temperature, the lower the ductile-brittle transition temperature (DBTT). Regardless of the DBTT in the unirradiated condition, however, the DBTT shift for 9Cr-1MoVNb steel due to irradiation was the same for all heat treatments. This means heat treatment can be used to ensure a lower DBTT before and after irradiation. The 12Cr-1MoVW steel showed little effect of heat treatment on DBTT in the unirradiated condition, and the shift in DBTT was relatively constant. Thus, it appears that heat treatment cannot be used to reduce the effect of irradiation on DBTT for this steel.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Fusion Energy Sciences (FES)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 10115547
• Report Number(s): CONF-911111--32; ON: DE92006592
• Resource Type: Conference paper/presentation
• Conference Information: Journal Name: Journal of Nuclear Materials Journal Issue: B
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103
360106
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700480
CHARPY TEST
COMPONENT DEVELOPMENT
DUCTILE-BRITTLE TRANSITIONS
GRAIN SIZE
HEAT TREATMENTS
MATERIALS STUDIES
MECHANICAL PROPERTIES
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
STEEL-CR12MOV
STEEL-CR9MONBV
THERMONUCLEAR REACTOR MATERIALS