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The International Journal of Advanced Manufacturing Technology

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05-07-2021 | ORIGINAL ARTICLE

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

Authors: Naima Ouali, Billel Cheniti, Brahim Belkessa, Bouzid Maamache, Ramdhane Kouba, Maamar Hakem

Published in: The International Journal of Advanced Manufacturing Technology | Issue 5-6/2021

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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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Title: Influence of isothermal aging in LDX 2101 duplex stainless steel on the microstructure and local properties
Authors: Naima Ouali
Billel Cheniti
Brahim Belkessa
Bouzid Maamache
Ramdhane Kouba
Maamar Hakem
Publication date: 05-07-2021
Publisher: Springer London
Published in: The International Journal of Advanced Manufacturing Technology / Issue 5-6/2021
Print ISSN: 0268-3768
Electronic ISSN: 1433-3015
DOI: https://doi.org/10.1007/s00170-021-07515-3

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