Small Punch Creep Testing Technique for Remnant Life Assessment

Abstract:

Small punch creep (SPC) testing technique is a material non-intensive testing technique for evaluating creep behavior of materials using miniature specimens. It can be used for remnant life assessment (RLA) studies on components in service, by scooping out limited material for testing without impairing the strength of component. In order to ensure the reliability of use of SPC technique for RLA, it is necessary to establish sound database on SPC properties of the material before putting into service. In this investigation, SPC technique was used to evaluate creep properties of 316LN stainless steel using specimens of size 10 x 10 x 0.5 mm. SPC tests were conducted in load controlled mode at 923 K and at various loads. SPC curves clearly exhibited primary, secondary and tertiary creep stages. The minimum deflection rate increased and rupture life decreased with an increase in applied load. Like in conventional creep test results, the minimum deflection rate obeyed Norton’s power law and Monkman-Grant relationship. SPC test was correlated with corresponding conventional creep test. Good correlation was established between creep rupture life values evaluated from SPC tests and conventional creep tests.

• Periodical: Applied Mechanics and Materials (Volumes 592-594)
• Pages: 739-743
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.592-594.739
• Online since: July 2014
• Authors: J. Ganesh Kumar*, K. Laha, M.D. Mathew
• Keywords: 316LN SS, RLA, Small Punch Creep

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