Abstract
As recommended by international standards, conventional methods of determining the mechanical properties of materials require relatively large test samples. This can create difficulties when only a limited amount of material is available for testing. The small punch test is one of the techniques that can replace traditional testing methods in such conditions.
In this paper, the small punch test (SPT) was used to estimate the mechanical properties of P110 steel at low temperature. Disc samples with a diameter of 8 mm and a height of 0.8 mm were prepared and then bent, in a temperature range of −180–23 °C. The ultimate force and fracture energy increased with temperature decrease down to −115 °C. For lower temperatures, a significant reduction in those parameters was observed. Based on the fracture energy–temperature curve, the ductile-brittle transition temperature for the SPT samples was estimated (Tsp) as being around −150 °C.
The SPT results were compared with fracture surface analyses. At room temperature, the fracture surface characteristics were typical for plastic deformation regimes. Around the maximum energy peak, the fracture character changed to quasi-brittle, and then became brittle.
It was also compared the SPT results with the ductile-brittle transition temperature obtained by the conventional Charpy test. The scaling factor “α” was calculated as 0.55.
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Acknowledgements
The work was financed by the National Centre for Research and Development within Blue Gas II Programme, Contract No. BG2/DIOX4SHELL/14.
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Stępniewska, M., Romelczyk-Baishya, B., Brynk, T., Giżyński, M., Pakieła, Z. (2019). Influence of Low Temperature on Mechanical Properties of Carbon Steel P110 Estimated by Means of Small Punch Test. In: Abdel Wahab, M. (eds) Proceedings of the 7th International Conference on Fracture Fatigue and Wear. FFW 2018. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-13-0411-8_15
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