Patra, Sudipta and Ghosh, Abhijit and Singhal, Lokesh Kumar and Podder, Arijit Saha and Sood, Jagmohan and Kumar, Vinod and Chakrabarti, Debalay (2017) Hot Deformation Behavior of As-Cast 2101 Grade Lean Duplex Stainless Steel and the Associated Changes in Microstructure and Crystallographic Texture. In: METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 48A (1). pp. 294-313.
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Abstract
The hot deformation behavior of 2101 grade lean duplex stainless steel (DSS, containing similar to 5 wt pct Mn, similar to 0.2 wt pct N, and similar to 1.4 wt pct Ni) and associated microstructural changes within delta-ferrite and austenite (gamma) phases were investigated by hot-compression testing in a GLEEBLE 3500 simulator over a range of deformation temperatures, T (def) 1073 K to 1373 K (800 A degrees C to 1100 A degrees C)], and applied strains, epsilon (0.25 to 0.80), at a constant true strain rate of 1/s. The microstructural softening inside gamma was dictated by discontinuous dynamic recrystallization (DDRX) at a higher T (def) 1273 K to 1373 K (1000 A degrees C to 1100 A degrees C)], while the same was dictated by continuous dynamic recrystallization (CDRX) at a lower T (def) (1173 K (900 A degrees C)]. Dynamic recovery (DRV) and CDRX dominated the softening inside delta-ferrite at T (def) 1173 K (900 A degrees C). The dynamic recrystallization (DRX) inside delta and gamma could not take place upon deformation at 1073 K (800 A degrees C). The average flow stress level increased 2 to 3 times as the T (def) dropped from 1273 to 1173 K (1000 A degrees C to 900 A degrees C) and finally to 1073 K (800 A degrees C). The average microhardness values taken from delta-ferrite and gamma regions of the deformed samples showed a different trend. At T (def) of 1373 K (1100 A degrees C), microhardness decreased with the increase in strain, while at T (def) of 1173 K (900 A degrees C), microhardness increased with the increase in strain. The microstructural changes and hardness variation within individual phases of hot-deformed samples are explained in view of the chemical composition of the steel and deformation parameters (T (def) and epsilon). (C) The Minerals, Metals & Materials Society and ASM International 2016
Item Type: | Journal Article |
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Publication: | METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE |
Additional Information: | Copy right for this article belongs to the SPRINGER, 233 SPRING ST, NEW YORK, NY 10013 USA |
Department/Centre: | Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy) |
Date Deposited: | 17 Feb 2017 04:14 |
Last Modified: | 17 Feb 2017 04:14 |
URI: | http://eprints.iisc.ac.in/id/eprint/56247 |
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