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Influence of isothermal aging in LDX 2101 duplex stainless steel on the microstructure and local properties

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Abstract

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.

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Authors and Affiliations

  1. Research Center in Industrial Technologies CRTI, P.O. Box 64, Chéraga, Algeria

    Naima Ouali, Billel Cheniti, Brahim Belkessa, Bouzid Maamache & Maamar Hakem

  2. Laboratoire de Technologie des Matériaux, Département SDM, Faculté de Génie Mécanique et Génie des Procédés, USTHB, BP 32 El-Alia, 16111, Algiers, Algeria

    Ramdhane Kouba

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Correspondence to Brahim Belkessa.

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Ouali, N., Cheniti, B., Belkessa, B. et al. Influence of isothermal aging in LDX 2101 duplex stainless steel on the microstructure and local properties. Int J Adv Manuf Technol 116, 1881–1893 (2021). https://doi.org/10.1007/s00170-021-07515-3

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