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Effect of the Thermal History on Macrostructure and Microstructure Development in High-Strength Steel Welds

Abstract : The present work addresses the microstructural and macrostructural development in multipass welded joints. It focuses on multiple thermal cycles induced by successive deposition of welding passes. The local welding-related thermal history was related in detail to the evolution of austenite grains during manufacturing of two high-strength low-alloy steel welds. The analytical Rosenthal thermal model was used to identify the thermal cycles experienced within typical weld metal regions. Selected heat cycles were applied to laboratory specimens, taken from the same weld metal, to investigate microstructural evolution during the welding process. Heat cycle experiments, involving full austenitization, showed the persistence of columnar zones resulting from a memory effect of the prior austenite grains during the reverse transformation. Intercritical heat cycles led to white-etching, softer regions with high fractions of retained austenite. They also showed that the memory of austenite grains was actually stored in elongated retained austenite particles that remained after complete welding. This memory effect vanished under high peak temperatures (typically, 130°C higher than Ac3); this was linked to a competition between growth and merging of elongated, intragranular retained austenite particles, and growth of equiaxed, intergranular austenite particles. Finally, a low peak temperature promoted refined, harder final microstructures.
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Contributor : Anne-Françoise Gourgues-Lorenzon Connect in order to contact the contributor
Submitted on : Friday, April 22, 2022 - 2:26:29 PM
Last modification on : Monday, June 27, 2022 - 3:03:02 AM
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Nicolas Jousset, Marine Gaumé, Florent Bridier, Julien Beaudet, Jean-Loup Heuzé, et al.. Effect of the Thermal History on Macrostructure and Microstructure Development in High-Strength Steel Welds. Metallurgical and Materials Transactions A, Springer Verlag/ASM International, inPress, ⟨10.1007/s11661-022-06686-2⟩. ⟨hal-03649371⟩



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