The effect of tantalum on the mechanical properties of a 9Cr 2W 0.25V 0.07Ta 0.1C steel
The effect of tantalum on the mechanical properties of a 9Cr 2W 0.25V 0.07Ta 0.1C steel
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DOI：
10.1016/s0022-3115(99)00035-5
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发表时间：
1999-07
影响因子：
3.1
通讯作者：
R. Klueh;D. Alexander;M. Rieth
中科院分区：
文献类型：
--
作者：
R. Klueh;D. Alexander;M. Rieth
Fe–9Cr–2W–0.25V–0.07Ta–0.1C (9Cr–2WVTa) 钢在快通量测试设备 (FFTF) 和高通量反应堆 (HFR) 中辐照前后均具有优异的强度和冲击韧性。在 FFTF 中，在 365°C 下经过 28 dpa 后，延性-脆性转变温度 (DBTT) 仅增加 32°C，而 9Cr-2WV 钢（与 9Cr-2WVTa 钢相同但不含钽）则变化约 60°C。尽管两种钢在辐照前后具有相似的拉伸性能，但仍存在这种差异。 9Cr-2WVTa钢具有较小的原奥氏体晶粒尺寸，但其他方面的显微组织在辐照前相似并且在辐照期间表现出相似的变化。 9Cr-2WVTa 钢的辐照行为与 9Cr-2WV 钢和其他类似钢有两个不同之处：（1）在 FFTF 中辐照的 9Cr-2WVTa 钢的 DBTT 变化在约 28 dpa 的注量下不会达到饱和，而对于 9Cr-2WV 钢和大多数类似钢，在 <10 dpa 时出现饱和；（2）在 FFTF 中辐照的 9Cr-2WVTa 钢的 DBTT 变化在FFTF 和 HFR 中辐照的 9Cr-2WVTa 钢随着辐照温度的增加而增加，而 9Cr-2WV 钢的辐照温度则降低，与大多数类似钢一样。 9Cr-2WVTa 钢性能的改善以及与其他钢的差异归因于固溶钽。
An Fe–9Cr–2W–0.25V–0.07Ta–0.1C (9Cr–2WVTa) steel has excellent strength and impact toughness before and after irradiation in the Fast Flux Test Facility (FFTF) and the High Flux Reactor (HFR). The ductile–brittle transition temperature (DBTT) increased only 32°C after 28 dpa at 365°C in FFTF, compared to a shift of ≈60°C for a 9Cr–2WV steel the same as the 9Cr–2WVTa steel but without tantalum. This difference occurred despite the two steels having similar tensile properties before and after irradiation. The 9Cr–2WVTa steel has a smaller prior-austenite grain size, but otherwise microstructures are similar before irradiation and show similar changes during irradiation. The irradiation behavior of the 9Cr–2WVTa steel differs from the 9Cr–2WV steel and other similar steels in two ways: (1) the shift in DBTT of the 9Cr–2WVTa steel irradiated in FFTF does not saturate with fluence by ≈28 dpa, whereas for the 9Cr–2WV steel and most similar steels, saturation occurs at <10 dpa, and (2) the shift in DBTT for 9Cr–2WVTa steel irradiated in FFTF and HFR increased with irradiation temperature, whereas it decreased for the 9Cr–2WV steel, as it does for most similar steels. The improved properties of the 9Cr–2WVTa steel and the differences with other steels were attributed to tantalum in solution.