Aging phenomenon in low molybdenum Fe-21Cr-5Mn-1.5Ni alloy: Microstructure evolution, texture development and corrosion behavior

Dandekar, TR and Khatirkar, RK and Mahadule, D and Chavhan, J and Kumar, D (2022) Aging phenomenon in low molybdenum Fe-21Cr-5Mn-1.5Ni alloy: Microstructure evolution, texture development and corrosion behavior. In: Materials Today Communications, 33 .

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Abstract

In the present work, the effect of long-term aging at 750 °C up to 480 h on microstructure evolution, texture development and corrosion behavior of a low molybdenum Fe–21Cr-1.5Ni–5Mn alloy has been investigated systematically. An increase in aging time results in increase in proportion of σ-phase. The σ-phase formation took place by the eutectoid decomposition reaction: δ → σ + γ2. The σ-phase did not show any specific orientation relationship with neighboring δ ferrite grains. The initial solution annealed sample showed the presence of strong Brass ({110}[removed]), Cube ({100}[removed]), Goss ({110}[removed]), and minor Cu ([removed]) in austenite, and strong γ-fiber (normal direction, ND//[removed]) along with minor α-fiber (rolling direction, RD//[removed]) in ferrite. After, long-term aging up to 480 h, austenite showed strong Cu ({112}[removed]) and minor Brass ({110}[removed]) along with Cube ({100}[removed]). Ferrite, on the other hand, showed γ-fiber. The lower amount of Cr/Mo and higher N in Fe-21Cr-1.5Ni-5Mn alloy was not enough to avoid the σ precipitation, however, it delayed its precipitation. The increase in σ-phase with aging time resulted in a decrease in corrosion resistance.

Item Type:	Journal Article
Publication:	Materials Today Communications
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to Elsevier Ltd
Keywords:	Austenite; Chromium alloys; Corrosion resistance; Ferrite; Iron alloys; Manganese alloys; Precipitation (chemical); Ternary alloys; Textures, Aging phenomenon; Aging time; Corrosion behaviour; Eutectoid decomposition; Long-term aging; Microstructure evolutions; Phase formations; Texture development; γ fibers; Σ-phase, Nickel alloys
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	29 Dec 2022 11:09
Last Modified:	29 Dec 2022 11:09
URI:	https://eprints.iisc.ac.in/id/eprint/78628

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