Mechanical behavior of welded plates of austenitic low-density Fe-Mn-Al-C steels microalloyed with Ti/B by microtensile testing
The present study investigates the microstructural evolution and mechanical behavior of an austenitic low-density Fe-27Mn-7Al-1.2 C steel microalloyed with Ti/B after autogenous gas tungsten arc welding (GTAW). Microtensile specimens were extracted from the fusion zone (FZ) and two heat-affected zon...
| Autores: | , , |
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| Tipo de documento: | artigo |
| Data de publicação: | 2026 |
| País: | España |
| Recursos: | Universitat Politècnica de Catalunya (UPC) |
| Repositório: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglês |
| OAI Identifier: | oai:upcommons.upc.edu:2117/455893 |
| Acesso em linha: | https://hdl.handle.net/2117/455893 https://dx.doi.org/10.1007/s00170-025-17374-x |
| Access Level: | Acesso embargado |
| Palavra-chave: | Low-density steel Welding Microtensile test Mechanical properties Strain hardening exponent Strain hardening rate ¿-phase Àrees temàtiques de la UPC::Enginyeria dels materials |
| Resumo: | The present study investigates the microstructural evolution and mechanical behavior of an austenitic low-density Fe-27Mn-7Al-1.2 C steel microalloyed with Ti/B after autogenous gas tungsten arc welding (GTAW). Microtensile specimens were extracted from the fusion zone (FZ) and two heat-affected zones (HAZ-1 and HAZ-2) and evaluated through optical and electron microscopy, electron backscattered diffraction (EBSD), X-ray diffraction (XRD), and Vickers microhardness testing. The welded joint exhibited dendritic austenite in the FZ and equiaxed austenite with ¿-carbide precipitation in the HAZs. The FZ showed the lowest mechanical performance (YS 395 MPa, UTS 534 MPa, elongation 45%), whereas HAZ-1 and HAZ-2 exhibited strengthening associated with ¿-carbides and TiC/AlN precipitates (UTS up to 671 MPa). Strain-hardening analysis using Hollomon and Ludwick models indicated a higher hardening capacity in the HAZs. The findings demonstrate how welding thermal cycles control precipitation, microstructural morphology, and mechanical response in LD steels, providing insight for improved weldability and performance of lightweight structural components. |
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