Analysis of V–Cr–Ti alloys in terms of activation of impurities

Grossbeck, M.L.; Klueh, R.L.; Cheng, E.T.; Peterson, J. R.; Woolery, M.R; Bloom, E.E.

doi:10.1016/s0022-3115(98)00228-1

Cited by 15 publications

(5 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Table 1 summarizes the chemical compositions of vanadium alloys in the world with the heat size of 30 kg or more. A US Department of Energy (DOE) program produced the largest 500 kg (US832665) and 1200 kg (US832864) heats before NIFS-HEATs [4,8]. These pioneering heats enabled study on fabrication technologies for welding and tubing for vanadium alloys.…”

Section: Introductionmentioning

confidence: 99%

“…Although some increase in O impurity is observed for NH2 compared with the above-mentioned level, the total of interstitial impurity level (C + N + O) of NH2 is almost half that of the US832665. As a result, weldabilty and workability were successfully improved because of enhanced ductility [4,9,11]. The new process also reduced metallic impurities creating long-lived radioactive isotopes, such as Al, Co, Nb, Ni and Mo.…”

Section: Introductionmentioning

confidence: 99%

“…In the high-temperature region, the thermal creep properties will determine the operating temperature limit of vanadium alloys, Chemical analysis method for NH2: Cr, Ti: ICP-OES, C: combustion infrared absorption, N: He carrier fusion thermal conductivity, O: He carrier fusion infrared absorption, Nb: ICP-MS, others: GD-MS [3]. US: C, N, O: not specified, others: GD-MS [4]. RF and SWIP: not specified [5,6].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

High-temperature creep properties of NIFS-HEAT-2 high-purity low-activation vanadium alloy

et al. 2019

View full text Add to dashboard Cite

A low-activation vanadium alloy with the composition of V-4 mass% Cr-4 mass% Ti is an alternative to reduced activation ferritic/martensitic steels for blanket structural material in fusion reactors. The NIFS-HEAT-2 (NH2) is the world’s highest-purity V–4Cr–4Ti alloy among over 30 kg scale heats. The processes to purify this heat have successfully enhanced workability, weldability and low-activation characteristics, however degradation of high-temperature strength was a concern due to possible purification softening. Therefore, the present study evaluated high-temperature creep properties of NH2 at around the operation temperature, 700 °C–800°C. The degradation of creep properties, such as shorter rupture time and enhanced creep rate, were observed for NH2, compared with a conventional US heat in the stress range of 150–200 MPa. On the other hand, it was revealed that these creep properties were comparable to those of the US heat in the lower applied stress of 100 MPa, though only short term rupture data are available at this moment. Since design stress for fusion blankets is expected below 100 MPa, purification up to the level of NH2 will induce no negative impact on the blanket service conditions.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

High-temperature creep properties of NIFS-HEAT-2 high-purity low-activation vanadium alloy

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Neutron-induced activation in fusion reactor components can be effectively controlled by the proper selection of materials for use in the first wall (FW) and the blanket etc., and is greatly influenced by the compositions and impurities in these materials. Research on reduced activation ferritic/martensitic steels (RAFM steels), vanadium alloys and SiC/SiC composites used as fusion structural materials is carried out worldwide during the recent 10-20 years to ensure the environmental and safety attractiveness of fusion nuclear power [7][8][9][10][11][12][13]. Vanadium alloys and SiC/SiC composites have many attractive properties such as superior high temperature thermal and physical properties, good resistance to neutron irradiation and low neutron activation level [4,5,14] and are considered as promising candidate structural materials for fusion reactor application in the future [1].…”

Section: Introductionmentioning

confidence: 99%

“…would dominate the activation level of fusion materials, and would substantially influence not only the recycling of used reactor materials but also the waste management of them [10][11][12][13]. The activation analysis of various fusion reactor structural materials including RAFM steels, vanadium alloys and SiC/SiC composites etc.…”

Section: Introductionmentioning

confidence: 99%