Effect of Carbon and Niobium Content on the Kinetics of Decomposition of Supercooled Austenite in Rolled Metal and Near-Weld Zone of Pipe Steels

Utkin, I. Yu.; Mentyukov, K. Yu.; Frantov, I. I.; Bortsov, A. N.

doi:10.1007/s11041-018-0187-4

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“…Temperature gradients and phase transformation in the solid state contribute to the change of thermal and mechanical properties of the material in the fusion zone and the HAZ [13,14]. The formation of microelements of bainite, ferrite, perlite, and martensite at different cooling rates can affect the microstructural development and properties of the material to ensure the stability of the process and the best quality of the compound [15][16].…”

Section: Introductionmentioning

confidence: 99%

Austenite Decomposition Kinetics in Laser-Hybrid Welding of Steel of Strength Class K52

Romantsov

Fedorov

Lodkov

2019

MSF

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A modern technology for joining materials welding is commonly used in various industries. It is a process of interaction of thermal, mechanical and metallurgical properties and behaviors. Complex phenomena, such as solidification, microstructural changes and defect formation, have a great impact on the quality of welded joints. This article presents the results of studying the features of the austenite decomposition kinetics in the application of laser-hybrid welding technology, in a combination with multi-arc automatic submerged arc welding. The cooling rates are determined, affecting the change in properties of HAZ of welded joints on pipe steel of strength class K52. Using the dilatometric method, studies were conducted and thermo-kinetic and structural diagrams were constructed. Analysis of diagrams and microstructures showed that, as a result of the impact of the laser-hybrid welding process in the area of HAZ, the decomposition of austenite occurs mainly in the martensitic zone, followed by the formation of a bainite-perlite structure, due to recrystallization from the heat generated by the facing seams.

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Section: Introductionmentioning

confidence: 99%