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Metals 2017, 7(6), 210; doi:10.3390/met7060210

Influence of Solution Treatment Temperature on Microstructural Properties of an Industrially Forged UNS S32750/1.4410/F53 Super Duplex Stainless Steel (SDSS) Alloy

1
Materials Science and Engineering Faculty, University POLITEHNICA of Bucharest, Bucharest 060042, Romania
2
FORJA ROTEC Ltd., Buzău 120224, Romania
*
Author to whom correspondence should be addressed.
Academic Editor: Rebecca L. Higginson
Received: 27 March 2017 / Revised: 30 May 2017 / Accepted: 2 June 2017 / Published: 7 June 2017
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Abstract

In this present study, the influence of solution annealing temperature on microstructural properties of a forged Super Duplex Stainless Steel (SDSS) was investigated by SEM-BSE (Scanning Electron Microscopy-Backscattered Electrons) and SEM-EBSD (Scanning Electron Microscopy-Electron Backscatter Diffraction) techniques. A brief solution treatment was applied to the forged super duplex alloy, at different temperatures between 800 °C and 1100 °C, with a constant holding time of 0.6 ks (10 min). Microstructural characteristics such as nature, weight fraction, distribution and morphology of constituent phases, average grain-size and grain misorientation were analysed in relation to the solution annealing temperature. Experimental results have shown that the constituent phases in the SDSS alloy are δ-Fe, γ-Fe and σ (Cr-Fe) and that their properties are influenced by the solution treatment temperature. SEM examinations revealed microstructural modifications induced by the Cr rich precipitates along the δ/γ and δ/δ grain boundaries, which may significantly affect the toughness and the corrosion resistance of the alloy. Solution annealing at 1100 °C led to complete dissolution of σ (Cr-Fe) phase, the microstructure being formed of primary δ-Fe and γ-Fe. The orientation relationship between δ/δ, γ/γ and δ/γ grains was determined by electron back scattering diffraction (EBSD). Both primary constituent phase’s microhardness and global microhardness were determined. View Full-Text
Keywords: super duplex stainless steel (SDSS); forging; solution annealing treatment; microstructure; γ-Fe (austenite); δ-Fe (ferrite); σ (Cr-Fe) phase super duplex stainless steel (SDSS); forging; solution annealing treatment; microstructure; γ-Fe (austenite); δ-Fe (ferrite); σ (Cr-Fe) phase
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Cojocaru, V.D.; Șerban, N.; Angelescu, M.L.; Cotruț, M.C.; Cojocaru, E.M.; Vintilă, A.N. Influence of Solution Treatment Temperature on Microstructural Properties of an Industrially Forged UNS S32750/1.4410/F53 Super Duplex Stainless Steel (SDSS) Alloy. Metals 2017, 7, 210.

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