The Experimental Analysis regarding the Evolution of Some Mechanical Characteristics for a Steel Used in Constructions of Conduits for Steam Transfer
Journal Title: Analele Universitatii "Dunarea de Jos" din Galati. Fascicula IX, Metalurgie si Stiinta Materialelor - Year 2011, Vol 34, Issue 1
Abstract
The metallographic analysis [4], revealed that the initial ferrite-pearlite structure of the steel under study shows slight tendencies for coalescence, decarburation and carbide precipitation. The precipitating carbides maintained their globular shape being located on the grain boundaries. Due to the metallurgical degradation, the mechanical degradation occurs as a consequence of both cavities and microcracks formation processes. Based on the values determined for the mechanical characteristics of the pipe under study it has been concluded that the material is suitable for continuing the service and has marked resistance reserves. These reserves have been explained by the absence of the marked processes of grain boundary decarburation and the carbide network formation.
Authors and Affiliations
Dumitru MIHAI, Silviu MACUTA
Use of Ecological Paradigm in Material Degradation Engineering
The necessity to move from the conventional technical-technological paradigms to the ecological paradigm is perfectly justified. The degradation of materials is defined as a negative phenomenon, whose study should be ext...
Sculpture, Extended Nature
The paper portrays some aspects that show how nature is implemented into the graphic values domain by confronting the physical image of the artistic subject. The article presents some rules that have marked over time the...
Emphasizing Physical Aspects and Applications of Graphenes
Graphenes have attracted much attention due to their properties and possible applications. This approach is dedicated to shortly describe the problems related to this promising element. Some aspects concerning physical d...
Study for Evaluation and Optimization of Mineral Composition and Structure of Iron Ore Granulation in Sintering Process
The characterization of iron ore particles is of vital importance for the study of mineral composition. The specific surface area of iron ore particles can be measured by laser diffraction, and mathematical models (based...
Research Regarding the Possibility of Obtaining Nitinol by Powder Metallurgy
In the paper the obtaining of nitinol by pressing and sintering of a mixture of nickel and titanium powders is presented. The fabrication of NiTi alloys by powder metallurgy allows avoiding the usual problems related to...