Influence of isothermal aging in LDX 2101 duplex stainless steel on the microstructure and local properties
| Autor: | Naima Ouali, Bouzid Maamache, Billel Cheniti, Maamar Hakem, Ramdhane Kouba, Brahim Belkessa |
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| Rok vydání: | 2021 |
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| Zdroj: | The International Journal of Advanced Manufacturing Technology. 116:1881-1893 |
| ISSN: | 1433-3015 0268-3768 |
| DOI: | 10.1007/s00170-021-07515-3 |
| Popis: | In the present work, the interface morphology and the evolution of nitride precipitates in LDX 2101 stainless steel isothermally treated at 750 °C for various aging times were investigated. The microstructure results showed that the Cr2N nitrides precipitated along the δ/γ interface with 200 nm in length and continue to grow to 2 μm after 240 h of aging. However, only Cr2N nitrides were found at the δ/δ interface after long term of aging. Atomic force microscopy (AFM) analysis revealed that Cr2N nitrides and Cr23C6 carbides started to precipitate after the first 10 min of aging with a small needle shape of the former and specific triangular morphology of the latter. The evolution of hardness and Young’s modulus of the interfaces, performed with nano-indentation measurements, showed that the δ/γ interface became harder (4.1 ± 0.2 GPa) with increasing aging times, whereas negligible changes in the hardness and elastic modulus were recorded at the δ/δ interface. 3D topographic analysis of the immersed surfaces revealed that the susceptibility of δ phase to preferential dissolution in 3.5% NaCl solution increased with aging time. This behavior was manifested by the important imperfections of δ phase, the high surface roughness (55.7 nm), and the deep corrosion pits (30 nm) along the δ/γ interface and around the Cr2N nitrides. |
| Databáze: | OpenAIRE |
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