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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
 and 
Ermina Mandžuka
Ermina Mandžuka
   | Jul 27, 2020
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Article Category: Original scientific paper
Published Online: Jul 27, 2020
Page range: 65 - 71
Received: Mar 20, 2020
Accepted: May 18, 2020
DOI: https://doi.org/10.2478/rmzmag-2020-0007
Keywords
© 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×.
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×.
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×
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×.
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×.
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×.
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.
The δ-ferrite content in annealed samples.

Figure 8

Hardness testing for different temperatures and time.
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
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