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Materials and Geoenvironment
Volume 67 (2020): Numero 2 (June 2020)
Accesso libero
Effect of Temperature and Time on Decomposition of δ-ferrite in Austenitic Stainless Steel
Almaida Gigović-Gekić
Almaida Gigović-Gekić
,
Hasan Avdušinović
Hasan Avdušinović
,
Amna Hodžić
Amna Hodžić
e
Ermina Mandžuka
Ermina Mandžuka
| 27 lug 2020
Materials and Geoenvironment
Volume 67 (2020): Numero 2 (June 2020)
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Article Category:
Original scientific paper
Pubblicato online:
27 lug 2020
Pagine:
65 - 71
Ricevuto:
20 mar 2020
Accettato:
18 mag 2020
DOI:
https://doi.org/10.2478/rmzmag-2020-0007
Parole chiave
austenitic stainless steel
,
δ-ferrite
,
σ-phase
,
carbides
,
hardness
© 2020 Almaida Gigović-Gekić et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
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.%
Si
Cr
Fe
Ni
Spectrum 1
5.01
33.27
55.65
4.1
Spectrum 2
4.57
26.28
60.73
6.11
Spectrum 3
3.52
20.01
67.04
7.80
Spectrum 4
3.57
20.35
67.92
8.16
Chemical composition of tested austenitic stainless steel
Chemical composition, wt./%
C
Si
Mn
Cr
Ni
P
S
N
0.08
3.81
7.0
18.0
8.0
0.008
0.015
0.162