Results of Crack-arrest Tests on Two Irradiated High-copper Welds PDF Download

Author: S. K. Iskander
Publisher:
ISBN:
Category : Nuclear pressure vessels
Languages : en
Pages :

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Author:
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ISBN:
Category :
Languages : en
Pages : 175

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The objective of the Heavy-Section Steel Irradiation Program Sixth Irradiation Series is to determine the effect of neutron irradiation on the shift and shape of the lower-bound curve to crack-arrest toughness data. Two submerged-arc welds with copper contents of 0.23 and 0.31 wt % were commercially fabricated in 220-mm-thick plate. Crack-arrest specimens fabricated from these welds were irradiated at a nominal temperature of 288°C to an average fluence of 1.9 x 1019 neutrons/cm2 (>1 MeV). This is the second report giving the results of the tests on irradiated duplex-type crack-arrest specimens. A previous report gave results of tests on irradiated weld-embrittled-type specimens. Charpy V-notch (CVN) specimens irradiated in the same capsules as the crack-arrest specimens were also tested, and a 41-J transition temperature shift was determined from these specimens. {open_quotes}Mean{close_quote} curves of the same form as the American Society of Mechanical Engineers (ASME) K{sub la} curve were fit to the data with only the {open_quotes}reference temperature{close_quotes} as a parameter. The shift between the mean curves agrees well with the 41-J transition temperature shift obtained from the CVN specimen tests. Moreover, the four data points resulting from tests on the duplex crack-arrest specimens of the present study did not make a significant change to mean curve fits to either the previously obtained data or all the data combined.

Author: WR. Corwin
Publisher:
ISBN:
Category : Charpy V-notch impact toughness
Languages : en
Pages : 19

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The objective of this study was to determine the effect of neutron irradiation on the shift and shape of the lower-bound curve to crack-arrest data. Two submerged-arc welds with copper contents of 0.23 and 0.31 wt% were commercially fabricated in 220-mm-thick plate. Crack-arrest specimens fabricated from these welds were irradiated at a nominal temperature of 288°C to an average fluence of 1.9 x 1019 neutrons/cm2 (> 1 MeV). A preliminary evaluation of the results shows that the neutron-irradiation induced crack-arrest toughness temperature shift is about the same as the Charpy V-notch impact temperature shift at the 41-J energy level. The shape of the lower-bound curves (for the range of test temperatures covered), compared to those of the ASME KIa-curve, did not seem to have been altered by irradiation.

Author:
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ISBN:
Category :
Languages : en
Pages : 44

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The objective of this study is to determine the effect of neutron irradiation on the shift and shape of the lower-bound curve to crack-arrest data. Two submerged-arc welds with copper contents of 0.23 and 0.31 wt % were commercially fabricated in 220-mm-thick plate. Crack-arrest specimens fabricated from these welds were irradiated at a nominal temperature of 288°C to an average fluence of 1.9 x 1019 neutrons/cm2 (>1 MeV). A preliminary evaluation of the results shows that the neutron-irradiation induced crack-arrest toughness temperature shift is about the same as the Charpy V-notch impact temperature shift at the 41-J energy level. The shape of the lower-bound curves, (for the range of test temperatures covered), compared to those of the ASME K{sub Ia}-curve did not seem to have been altered by irradiation. 10 refs., 9 figs., 7 tabs.

Author: D. S. Gelles
Publisher: ASTM International
ISBN: 0803120168
Category : Materials
Languages : en
Pages : 1169

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Author: RL. Swain
Publisher:
ISBN:
Category : Crack arrest
Languages : en
Pages : 21

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The crack-arrest fracture toughness (Ka) of unirradiated and irradiated specimens machined from a low upper-shelf, high-copper weld was determined. The specimens were machined from the beltline weld of the Midland Unit 1 nuclear reactor pressure vessel (RPV). This weld was fabricated from one heat of weld wire and one lot of welding flux and bears the designation WF-70. It is of particular interest because it has been used in several RPVs that may still be in operation. The effect of irradiation has been measured in terms of the shift of the mean and lower-bound crack-arrest fracture toughness versus temperature curves. These shifts are compared to (1) 41-J transition temperature shift from Charpy V-notch (CVN) tests, ?TT41-J; (2) shift in the Master Curve transition temperature, T0, at the 100 MPa?m level, ?T0; and (3) shift of the "arrest force" Fa temperature determined from instrumented CVN testing, ?TFa. Preliminary results indicate that the shift of Ka of this low upper-shelf energy weld is approximately the same as the shift ?TT41-J, larger than ?T0, and significantly larger than ?TFa.

Author:
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Category :
Languages : en
Pages : 19

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The objective of the study on the high-copper welds is to determine the effect of neutron irradiation on the shift and shape of the ASME K{sub Ic} and K{sub Ia} toughness curves. Two submerged-arc welds with copper contents of 0.23 and 0.31 wt % were commercially fabricated in 220-mm-thick plate. Compact specimens fabricated from these welds were irradiated at a nominal temperature of 288°C to fluences from 1.5 to 1.9 x 1019 neutrons/cm2 (>1 MeV). The fracture toughness test results show that the irradiation-induced shifts at 100 MPa/m were greater than the Charpy 41-J shifts by about 11 and 18°C. Mean curve fits indicate mixed results regarding curve shape changes, but curves constructed as lower boundaries to the data do indicate curves of lower slopes. A preliminary evaluation of the crack-arrest results shows that the neutron-irradiation induced crack-arrest toughness temperature shift is about the same as the Charpy V-notch impact temperature shift at the 41-J energy level. The shape of the lower bound curves (for the range of test temperatures covered), compared to those of the ASME K{sub Ia} curve did not appear to have been altered by the irradiation. Three-wire stainless steel weld overlay cladding was irradiated at 288°C to fluences of 2 and 5 x 1019 neutrons/cm2 (>1 MeV). Charpy 41-J temperature shifts of 13 and 28°C were observed, respectively. For the lower fluence only, 12.7-mm thick compact specimens showed decreases in both J{sub Ic} and the tearing modulus. Comparison of the fracture toughness results with typical plate and a low upper-shelf weld reveals that the irradiated stainless steel cladding possesses low ductile initiation fracture toughness comparable to the low upper-shelf weld. 8 refs., 12 figs., 2 tabs.

Author: Margaret L. Hamilton
Publisher: ASTM International
ISBN: 0803128525
Category : Materials
Languages : en
Pages : 1266

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Author: Roger E. Stoller
Publisher: ASTM International
ISBN: 080311477X
Category : Materials
Languages : en
Pages : 1315

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Symposium held in Nashville, Tennessee, June 1990. Almost two-thirds of these 91 papers are authored by researchers outside of the US (including information on research in the former USSR, Japan, and Europe). Topics include: current commercial power reactor systems; microstructural characterization

Author: R. K. Nanstad
Publisher: ASTM International
ISBN: 080312614X
Category : Materials
Languages : en
Pages : 1135

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