The round robin tests of the SPT method for its further use in the assessment of power plants materials

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F25870807%3A_____%2F19%3AN0000025" target="_blank" >RIV/25870807:_____/19:N0000025 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

The round robin tests of the SPT method for its further use in the assessment of power plants materials

Original language description

The long-term operation of power plants can cause changes in the properties of structural materials. To ensure the safe and reliable operation, it is necessary to monitor and evaluate these changes. Various standard tests are available for the determination of mechanical properties such as tensile strength, ductile-brittle transition temperature and fracture toughness, which are required for the structural integrity assessment of power plants components. However, specimens for standard test have relatively large dimensions and for operated power plants there is a problem with the lack of the suitable material to assess the current state of material degradation. With the use of a special sampling machine it is possible to obtain small volume of original materials from large components in chemical or power plant industry. The machine’s unique hemispherical cutter is able to remove samples without violation integrity or other influence on the material. The Small Punch Test (SPT) method can be used to evaluate the mechanical properties from a small volume of obtained material. This method is currently undergoing a standardization process both CEN and ASTM. The principle of SPT testing procedure is penetration of the disk specimen by hemispheric rod. Disk shaped specimen has 8 mm in diameter and 0.5 mm in thickness. Using relatively simple system with record of the load and deflection values, there is possible to obtain the data of basic mechanical properties. This paper presents the results of the round-robin tests of the SPT method, carried out in the three different labs, on the materials from the power plant components. On the basis of the obtained results, the influence of the test matrix geometry, production accuracy as well as the defined test parameters was evaluated.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

20501 - Materials engineering

Project

<a href="/en/project/TK01020160" target="_blank" >TK01020160: Complex procedures of material engineering to ensure the safe operation of innovated blocks of fossil power plants.</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů