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Title: The Investigation of Structure Heterogeneous Joint Welds in Pipelines
Authors: Lyubimova, Lyudmila Leonidovna
Fisenko, Roman Nikolaevich
Breus, Sergei
Tabakaev, Roman Borisovich
Keywords: структуры; сварные швы; трубопроводы; микротвердость; трещины; сварные соединения
Issue Date: 2016
Publisher: [s. n.]
Citation: The Investigation of Structure Heterogeneous Joint Welds in Pipelines / L. L. Lyubimova [et al.] // MATEC Web of Conferences. — 2016. — Vol. 72 : Heat and Mass Transfer in the System of Thermal Modes of Energy – Technical and Technological Equipment (HMTTSC-2016) : April 19-21, 2016, Tomsk, Russia : [proceedings]. — [01059, 6 p.].
Abstract: Welding joints of dissimilar steels don’t withstand design life. One of the important causes of premature destructions can be the acceleration of steel structural degradation due to cyclic mechanical and thermal gradients. Two zones of tube from steel 12H18N9T, exhibiting the structural instability at early stages of the decomposition of a supersaturated solid austenite solution, were subjected to investigation. Methods of x-ray spectral and structure analysis, micro hardnessmetry were applied for the research. Made the following conclusions, inside and outside tube wall surfaces of hazardous zones in welding joint have different technological and resource characteristics. The microhardness very sensitive to changes of metal structure and can be regarded as integral characteristic of strength and ductility. The welding processes are responsible for the further fibering of tube wall structure, they impact to the characteristics of hot-resistance and long-term strength due to development of ring cracks in the welding joint of pipeline. The monitoring of microhardness and structural phase conversions can be used for control by changes of mechanical properties in result of post welding and reductive heat treatment of welding joints.
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