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Effect of Temperature and Time on Decomposition of δ-ferrite in Austenitic Stainless Steel Cover

Effect of Temperature and Time on Decomposition of δ-ferrite in Austenitic Stainless Steel

Materials and Geoenvironment
Volume 67 (2020): Issue 2 (June 2020)
By: Almaida Gigović-Gekić,  Hasan Avdušinović,  Amna Hodžić and  Ermina Mandžuka  
Open Access
|Jul 2020

Figures & Tables

Figure 1

Optical micrographs specimen in solution annealed state: (a) rolling direction and (b) transverse direction, Murakami's reagent (etching at high temperature), 200×.

Figure 2

Optical micrographs specimen heat treated at 750°C for (a) 5, (b) 15, (c) 30, (d) 60, (e) 120 and (f) 180 min, Murakami's reagent (etching at high temperature), 500×.

Figure 3

Optical micrographs specimen heat treated at 850°C for (a) 5, (b) 15, (c) 30, (d) 60, (e) 120 and (f) 180 min, Murakami's reagent (etching at high temperature), 500×

Figure 4

Micrograph of transformation of the δ-ferrite using scanning electron microscope after annealing at 750°C for 5 min, 3,000×.

Figure 5

Micrograph of σ-phase using scanning electron microscope after annealing at 750°C for 30 min, 3,000×.

Figure 6

Optical micrographs specimen heat treated: (a) at 750°C for 30 min (cooling in air) and (b) at 850°C for 30 min (cooling in air), Murakami's reagent (etching at room temperature), 500×.

Figure 7

The δ-ferrite content in annealed samples.

Figure 8

Hardness testing for different temperatures and time.

Energy-dispersive spectrometer analysis

Chemical composition, wt.%
SiCrFeNi
Spectrum 15.0133.2755.654.1
Spectrum 24.5726.2860.736.11
Spectrum 33.5220.0167.047.80
Spectrum 43.5720.3567.928.16

Chemical composition of tested austenitic stainless steel

Chemical composition, wt./%
CSiMnCrNiPSN
0.083.817.018.08.00.0080.0150.162
DOI: https://doi.org/10.2478/rmzmag-2020-0007 | Journal eISSN: 1854-7400
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Language: English
Page range: 65 - 71
Submitted on: Mar 20, 2020
|
Accepted on: May 18, 2020
|
Published on: Jul 27, 2020
Published by: Sciendo
In partnership with: Paradigm Publishing Services
Publication frequency: 4 issues per year
Keywords:
austenitic stainless steel,
δ-ferrite,
σ-phase,
carbides,
hardness
Related subjects:
Computer sciences,
Databases and data mining,
Geosciences,
Geodesy,
Geology and mineralogy,
Materials sciences,
Materials characterization and properties

© 2020 Almaida Gigović-Gekić, Hasan Avdušinović, Amna Hodžić, Ermina Mandžuka, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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