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Microstructure-mechanical properties correlation of irradiated conventional and reduced-activation martensitic steels
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Microstructure-mechanical properties correlation of irradiated conventional and reduced-activation martensitic steels

R.L. Klueh, Ji-Jung Kai 和 D.J. Alexander
Journal of Nuclear Materials, 卷.225, 頁碼.175-186
1995
DOI: https://doi.org/10.1016/0022-3115(95)00061-5

摘要

Nuclear and High Energy Physics Nuclear Energy and Engineering Materials Science (all)
Tensile, Charpy, and transmission electron microscopy specimens of two conventional steels, modified 9Cr1Mo (9Cr1MoVNb) and Sandvik HT9 (12Cr1MoVW), and two reduced-activation steels, Fe9Cr2W-0.25V-0.1C (9Cr2WV) and Fe9Cr2W0.25V0.07V0.07TaTa0.1C (9Cr2WVTa), were irradiated in the Fast Flux Test Facility. Before irradiation, M 23 C 6 was the primary precipitate in all four steels, which also contained some MC. Neutron irradiation did not substantially alter the M 23 C 6 and MC. No new phases formed during irradiated of the 9Cr and 9CrWVTa, but chi-phase precipitated in the 9Cr1MoVNb and chi-phase and α′ precipitated in the 12Cr1MoVW. Irradiation-produced dislocation loops formed in the 9Cr2WV, 9Cr2WVTa, and 12Cr1MoVW The microstructural changes caused the steels to harden, as measured by the change in yield stress. Hardening was correlated with a change in the Charpy impact properties of the 9Cr1MoVNb, 12Cr1MoVW, and 9Cr2WV. Although irradiation caused a yield stress increase in 9Cr2WVTa similar to that for the 9Cr2WV and 9Cr1MoVNb, the change in Charphy properties was considerably less for the 9Cr2WVTa. This different in Charpy behavior of the 9Cr2WVTa with that of the 9Cr2WV and 9Cr1MoVNb was attributed to differences in the fracture stress-temperature relationship and/or the flow stress-temperature relationship between the 9Cr2WVTa and the other two 9Cr steels. © 1995, All rights reserved.

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