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Effect of solution annealing temperature on precipitation in 2205 duplex stainless steel

Kashiwar, A.; Vennela, N. Phani; Kamath, S.L.; Khatirkar, R.K.

Abstract:
In the present study, effect of solution annealing temperature (1050 °C and 1100 °C) and isothermal ageing (700 °C: 15 min to 6 h) on the microstructural changes in 2205 duplex stainless steel has been investigated systematically. Scanning electron microscopy and X-ray diffraction were adopted to follow the microstructural evolution, while an energy dispersive spectrometer attached to scanning electron microscope was used to obtain localised chemical information of various phases. The ferritic matrix of the two phase 2205 duplex stainless steel (~ 45% ferrite and ~ 55% austenite) undergoes a series of metallurgical transformations during ageing—formation of secondary austenite (γ2) and precipitation of Cr and Mo rich intermetallic (chi-χ and sigma-σ) phases. For solution annealing at 1050 °C, significant amount of carbides were observed in the ferrite grains after 1 h of ageing at 700 °C. χ Phase precipitated after the precipitation of carbides—preferentially at the ferrite–ferrite and also at the ferrite–austenite boundaries. σ Phase was not observed in significant quantity even after 6 h of ageing. The sequence of precipitation in ... mehr


Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Jahr 2012
Sprache Englisch
Identifikator ISSN: 1044-5803, 1873-4189
KITopen ID: 1000071637
Erschienen in Materials characterization
Band 74
Seiten 55-63
Schlagworte Precipitation, Scanning electron microscopy, X-ray diffraction, Energy dispersive spectroscopy, Ageing
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