Próba udarności Charpyego i parametr Lateral expansion w ocenie materiałów spawalniczych dla potrzeb kriogeniki
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Abstract
W publikacji poruszone zostały kwestie związane z charakterem pękania metali, zdolności absorbcji energii dynamicznej i samohamowania pęknięć. Omówiono podstawy próby udarności metali i stopów sposobem Charpyego, z uwzględnieniem różnic w amerykańskim i europejskim wariancie próby. Podkreślono wady i zalety sposobów oceny ciągliwości przełomów udarnościowych opartych na udziale przełomu plastycznego SFA i rozszerzeniu poprzecznym LE. W dalszej części publikacji przedstawiono materiały spawalnicze firmy metrode przeznaczone do zastosowań kriogenicznych oraz ich właściwości ze szczególnym uwzględnieniem KV i LE w temperaturze 196 st. C.
Charpy impact test and lateral expansion parameter in welding consumables evaluation for cryogenic application
In the Charpy impact test three key measurements be made total absorbed energy, Shear Facture Area SFA and Lateral Expansion LE. However, although these three magnitudes have been available from the Charpy test, two of them SFA and LE have been just lately launched in Europe along with new standard En ISO 148, which combines both American (ASTM E23) and European (EN 10045) regulations. In this paper principles of the impact tests and ductile-brittle fracture characterization are provided as well as comparison between American and European variants of the Charpy impact test. The second part covers specialist and the most demanding area for welding consumables for joining 304L and 316L stainless steel that are subject to service temperatures down to 196 grad C. The dedicated range of controlled ferrite ‘CF consumables manufactured by metrode is also described and some of the applications for which they have been use are highlighted.
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