Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Patent
1977-01-28
1981-06-16
Schafer, Richard E.
Stock material or miscellaneous articles
All metal or with adjacent metals
Composite; i.e., plural, adjacent, spatially distinct metal...
75125, 75128W, 176 88, 219137WM, B23K 900
Patent
active
042738385
ABSTRACT:
A range of weld metals is disclosed that is resistant to changes in nil-ductility transition temperatures (NDTT) caused by exposure to neutron fluences greater than 1.times.10.sup.17 neutrons per square centimeter. Designed for use in nuclear reactor pressure vessels, the weldment that exhibits this resistance to neutron-induced ductility decreases is characterized by the condition that an index is less than 0.4. That index is the ratio of the sum of the weight percentages of nickel and silicon in the metal to the sum of the weight percentages in the metal of manganese, chromium and molybdenum. This constraint on the index, when applied to a weld metal within the composition ranges given in this specification, gives a weldment resistant to neutron-induced property changes.
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Hawthorne, J. R., Nuclear Engineering and Design, 11:427-46, (1970).
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Combustion Engineering Inc.
Fournier, Jr. Arthur E.
Schafer Richard E.
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