Creep test with use of miniaturized specimens

4th International Conference Recent Trends in Structural Materials

Chvostová, E.^1 ; Dugan, J.^1

COMTES FHT A.s., Dobany, EU, Czech Republic^1

关键词: Destructive sampling;    Miniature specimens;    Operating devices;    Residual lifetime;    Residual service life;    Small punch test;    Sub-sized samples;    Testing method;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/179/1/012032/pdf
DOI  :  10.1088/1757-899X/179/1/012032

来源: IOP

【 摘 要 】

Application of the mini samples methods is very common especially for residual service life assessment of the components operating in the energy sector. Residual lifetime of operating device can be evaluated using standard tests, but these usually cannot be performed due to limited material amount that can be extracted from the components. It is possible to use in these cases a semi destructive sampling of materials and testing methods employing miniature specimens. This article deals with comparison of the creep results obtained with the use of on standard test bars and sub sized samples such as Small Punch Test and newly proposed miniature samples that are axially loaded. The experiment was performed on steam line steel CSN 15 128 after operation. Emphasis was put to practical use of the test results and therefore residual life was assessed with the use of standard and new mini specimens. The results obtained for standard and mini samples exhibit very good agreement without necessity of any correlation as in the case of SPT and thus much more straight forward approach can be applied even for "unknown materials".