Effect of Helium on High-temperature Tensile Properties and Swelling of Vanadium and Vanadium Alloys PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
From fifth symposium on engineering problems of fusion research; Princeton, New Jersey, USA (6 Nov 1973). Sheet tensile samples of V-15 wt% Cr-5 wt% Ti were implanted with ~25 atomic ppM of helium at the ANL Cyclotron and tested at temperatures from 650 to 900 deg C. When compared with the control samples, the helium-injected samples show an increasing loss of ductility with increasing temperatures above 700 deg C. The loss of ductility in the helium- injected samples is accompanied by transition from a ductile, transgranular fracture to a completely intergranular fracture. The control samples fracture transgranularly throughout the range of test temperature. The effect of helium on void swelling was studied in two grades of vanadium using heavy-ion bombardment. High-purity vanadium (145 ppM C + N + O) and commercial-purity vanadium (1220 ppm C + N + O) were bombarded with 3.25-MeV Ni ions at 650 and 750 deg C to a damage level of 60 displacements per atom after preinjection with helium. Quantitative microscopy of the irradiated samples showed that the overall swelling was unaffected at 650 deg C, but was significantly reduced at 750 deg C, if the helium content was increased from 10 to 100 atomic ppM. The reduction in swelling appears to be associated with the presence of a high concentration of small helium bubbles that act as the predominant sinks for the radiation-induced point defects. (auth).
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
From fifth symposium on engineering problems of fusion research; Princeton, New Jersey, USA (6 Nov 1973). Sheet tensile samples of V-15 wt% Cr-5 wt% Ti were implanted with ~25 atomic ppM of helium at the ANL Cyclotron and tested at temperatures from 650 to 900 deg C. When compared with the control samples, the helium-injected samples show an increasing loss of ductility with increasing temperatures above 700 deg C. The loss of ductility in the helium- injected samples is accompanied by transition from a ductile, transgranular fracture to a completely intergranular fracture. The control samples fracture transgranularly throughout the range of test temperature. The effect of helium on void swelling was studied in two grades of vanadium using heavy-ion bombardment. High-purity vanadium (145 ppM C + N + O) and commercial-purity vanadium (1220 ppm C + N + O) were bombarded with 3.25-MeV Ni ions at 650 and 750 deg C to a damage level of 60 displacements per atom after preinjection with helium. Quantitative microscopy of the irradiated samples showed that the overall swelling was unaffected at 650 deg C, but was significantly reduced at 750 deg C, if the helium content was increased from 10 to 100 atomic ppM. The reduction in swelling appears to be associated with the presence of a high concentration of small helium bubbles that act as the predominant sinks for the radiation-induced point defects. (auth).
Author: Publisher: ISBN: Category : Languages : en Pages : 7
Book Description
Tensile properties of V-4Cr-4Ti (Heat BL-47), 3Ti-1Si (BL-45), and V-5Ti (BL-46) alloys after irradiation in a conventional irradiation experiment and in the Dynamic Helium Charging Experiment (DHCE) were reported previously. This paper presents revised tensile properties of these alloys, with a focus on the effects of dynamically generated helium of ductility and work-hardening capability at
Author: Publisher: ISBN: Category : Languages : en Pages : 14
Book Description
One property of the vanadium-based alloys that is not well understood for the purpose of application as fusion reactor structural material is the effect of simultaneous generation of helium and neutron damage under conditions relevant to fusion-reactor operation. In the present dynamic helium charging experiment (DHCE), helium was produced uniformly in the specimen at linear rates ranging from (approximately)0.4 to 4.2 appm helium/dpa by the decay of tritium during irradiation to 18-31 dpa at 425-600°C in the Li-filled DHCE capsules in the Fast Flux Test Facility. This paper presents results of postirradiation tests of mechanical properties of V-4Cr-4Ti alloy which has been identified as the most promising candidate alloy on the basis of its superior baseline and irradiation properties. Effects of helium on tensile strength and ductility were insignificant for test temperatures>420°C. However, room-temperature ductilities of the DHCE specimens were higher than those of the non-DHCE specimens (negligible helium generation) whereas strengths were lower, indicating that different types of hardening centers are produced during the DHCE and non-DHCE irradiation. Ductile-brittle transition behavior of the DHCE specimens was also determined from bend tests on TEM disks and broken tensile specimens. No brittle behavior was observed at temperatures>-150°C for DHCE specimens. Predominantly brittle-cleavage fracture morphologies were observed only at -196°C in some specimens that were irradiated to 31 dpa at 425°C during DHCE. In strong contrast to tritium-trick experiments in which a large amount of helium is produced in absence of displacement damage, no intergranular fracture was observed in any tensile or bend-tested specimens that were irradiated in the DHCE.
Author: HM. Chung Publisher: ISBN: Category : Cleavage Languages : en Pages : 9
Book Description
One property of vanadium-base alloys that is not well understood in terms of their potential use as fusion reactor structural materials is the effect of simultaneous generation of helium and neutron damage under conditions relevant to fusion reactor operation. In the present Dynamic Helium Charging Experiment (DHCE), helium was produced uniformly in the specimen at linear rates ranging from?0.4 to 4.2 appm helium/dpa during irradiation to 18-31 dpa at 425-600°C in the Li-filled capsules. Results of postirradiation tests of mechanical properties of V-4Cr-4Ti, an alloy identified to be most promising, are presented. Effects of helium on tensile strength and ductility at 420-600°C were insignificant for irradiation at these temperatures. However, postirradiation ductilities measured at 20-200°C were higher than those of the non-DHCE specimens (negligible helium generation), whereas strengths were lower, indicating that different types of hardening centers were produced during DHCE and non-DHCE. Ductile-brittle transition behavior of the DHCE specimens was determined from multiple bend tests on TEM disks and broken tensile specimens. No brittle behavior was observed at temperatures >-175°C. In contrast to tritium-trick experiments in which grain-boundary coalescence of helium is pronounced in the absence of displacement damage, no intergranular fracture was observed in tensile or bend-tested DHCE specimens.
Author: Publisher: ISBN: Category : Languages : en Pages : 13
Book Description
One property of vanadium-base alloys that is not well understood in terms of their potential use as fusion reactor structural materials is the effect of simultaneous generation of helium and neutron damage. In the present Dynamic Helium Charging Experiment (DHCE), helium was produced uniformly in the specimen at linear rates of (almost equal to) 0.4 to 4.2 appm helium/dpa by the decay of tritium during irradiation to 18--31 dpa at 425--600 C in Li-filled capsules in a sodium-cooled fast reactor. This paper presents results of postirradiation examination and tests of microstructure and mechanical properties of V-5Ti, V-3Ti-1Si, V-8Cr-6Ti, and V-4Cr-4Ti (the latter alloy has been identified as the most promising candidate vanadium alloy). Effects of helium on tensile strength and ductility were insignificant after irradiation and testing at> 420 C. However, postirradiation ductilities at 250 C were higher than those of the non-DHCE specimens (
Author: K. Abe Publisher: ISBN: Category : Fusion reactor materials Languages : en Pages : 13
Book Description
Helium embrittlement of binary vanadium alloys has been studied using three methods of helium doping. Helium doping using the tritium trick method yields severe embrittlement at 800°C for all the alloys studied including unalloyed vanadium. The boron-10 method resulted in slight ductility loss at 800°C. Specimens doped using cyclotron implantation showed virtually no ductility loss, but some effect of helium was observed in the fractured surface. Helium release measured during tension tests has good correlation with the degree of embrittlement. These results are discussed in terms of the different state of helium clusters/ bubbles as a result of different doping methods.
Author: DN. Braski Publisher: ISBN: Category : Fusion reactors Languages : en Pages : 18
Book Description
Tensile specimens of V-15Cr-5Ti, Vanstar-7, V-3Ti-lSi, and V-20TJ were irradiated at 420°C in FFTF-MOTA to a damage level of 82 dpa. Helium was preimplanted to levels up to 480 appm in selected specimens using a modified tritium trick. Irradiation hardeningwas the dominant effect influencing the post irradiation tensile properties, and it markedly increased the yield strength and reduced the total elongation. The V-15Cr-5Ti alloy was very sensitive to helium embrittlement, but Vanstar-7 and V-3Ti-lSi were only slightly affected. Without helium, negligible swelling was found in V-15Cr-5Ti and Vanstar-7, and only small values of swelling (
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Author: HM. Chung
Author: J.A. Dijkstra
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Author: David R. Mathews
Author: K. Abe
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Author: DN. Braski