BRITTLENESS PROBLEM OF PUDDLED STEEL RESULTING FROM MICROSTRUCTURAL DEGRADATION PROCESSES IN TERMS OF STATIC, CYCLIC AND DYNAMIC TESTS
Journal Title: Scientific Journal of the Military University of Land Forces - Year 2011, Vol 162, Issue 4
Abstract
In the paper the investigation results of puddled steel from nineteenth-century constructions are presented. The results of static tensile tests after more than 130-year operating period: fracture toughness, the critical value of the J integral and the fatigue crack growth, and dynamic tests – toughness results are presented in this article. The results show a significant effect of degradation processes. The abovementioned processes caused the brittleness of puddled steel. All the tests were performed for the material in two states, i.e. post-operated and normalised ones. In accordance with the guidelines developed in the framework of the degradation theory [4] and its material aspects [8], normalising is designed to reproduce the microstructure of steel in the initial state. The results presented allow us to draw the conclusions about trends related to the nature and future negative changes in mechanical properties.
Authors and Affiliations
Grzegorz LESIUK, Józef RABIEGA, Mieczysław SZATA
Keywords
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