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Journal of applied research and technology

On-line version ISSN 2448-6736Print version ISSN 1665-6423

Abstract

PEERATATSUWAN, C.; YINGPAIBOONSUKH, P.  and  CHOWWANONTHAPUNYA, T.. Microstructural analysis of cracked steam drum plate during fabrication process. J. appl. res. technol [online]. 2023, vol.21, n.6, pp.975-981.  Epub Aug 13, 2024. ISSN 2448-6736.  https://doi.org/10.22201/icat.24486736e.2023.21.6.1994.

The understanding of the fracture mechanisms of the thick steel plate cracked during the fabrication is of paramount importance for the improvement of the fabrication process for the pressure-containing vessels like steam drums. This article presented the microstructural analysis of the fractured steam drum plate during the fabrication process. The analysis involved visual inspection, chemical analysis, micrograph study, tensile test, and impact test. Results exhibited that the failure of the steel plate was related to the brittle fracture, initiated from the notch, and propagated in the transverse direction perpendicular to the rolling direction. The formation of martensite was found in the affected area, which lowered the crack resistance of the steel plate. The cold working conditions of the steel plate were induced by the rolling process and subsequently facilitated the fracture propagation. It is advised to conduct a grinding process to remove the notch and the heat affected zone. Warming the steel plate to be significantly above 0oC is also suggested to be performed prior to the fabrication process.

Keywords : Brittle fracture; crack resistance; microstructure; failure.

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