Nano-carbide strengthened as-welded joint for precipitation-hardened austenitic Fe–Mn–Al–C lightweight alloys
| Autor: | Tswen-Hsin Liu, Jenn-Ming Yang, Jenh-Yih Juang, Chien-Hsin Wu, H.Y. Chen |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Austenite
Materials science Mining engineering. Metallurgy Gas tungsten arc welding Metallurgy Metals and Alloys TN1-997 Mechanical properties Welding Surfaces Coatings and Films law.invention Biomaterials Fusion welding κ-carbide Precipitation hardening law Ultimate tensile strength Spinodal decomposition Ceramics and Composites Ductility FeMnAlC alloy Liquation |
| Zdroj: | Journal of Materials Research and Technology, Vol 14, Iss, Pp 269-276 (2021) |
| ISSN: | 2238-7854 |
| Popis: | To date, fusion welding the precipitation-hardened austenitic Fe–Mn–Al–C lightweight alloys still remains an insurmountable challenge. In the present study, the viability of using a Fe-28.3Mn-10.2Al-1.62C (in wt.% hereafter) as a welding filler wire for gas tungsten arc welding (GTAW) of as-hot-rolled Fe-29.2Mn-8.8Al-1.65C base material (BM) were systematically investigated. It was striking that in the as-welded condition, a high density of nano-sized κ-carbide precipitates was formed by spinodal decomposition within the significantly refined austenite dendrite cells in the fusion zone (FZ). This unique feature is critical to achieve a high weld strength in virtually all fusion welded precipitation-hardened alloys. In the heat-affected zone (HAZ), the strengthening nano-sized κ-carbides originally existed in the BM was also preserved with no sign of dissolution or noticeable coarsening. Consequently, the as-welded joint exhibited a fairly uniform microhardness across the FZ, HAZ and BM. More significantly, the entire as-welded joint is free of any solidification cracking and/or liquation cracking. The as-welded joint also exhibited an excellent combination of yield strength, ultimate tensile strength and ductility. |
| Databáze: | OpenAIRE |
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