Naslov
Microstructure of heat-resistant austenitic steel after isothermal annealing at 700 °C

Autori
Gojić, Mirko ; Kožuh, Stjepan ; Šavli, Štefan ; Nagode, Aleš ; Kosec, Borut ; Kosec, Ladislav

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings book of 12th International Foundrymen Conference / Dolić, Natalija ; Glavaš, Zoran ; Zovko Brodarac, Zdenka - Sisak : Metalurški fakultet Sveučilišta u Zagrebu, 2012, 83-91

ISBN
978-953-7082-14-7

Skup
Sustainable Development in Foundry Materials and Technologies

Mjesto i datum
Opatija, Hrvatska, 24.05.2012. - 25.05.2012

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
heat-resistant stainless steel; isothermal annealing; sigma phase; microhardness; fracture

Sažetak
Heat-resistant stainless steel is very important while it is suitable for high-temperature applications. This paper presents the results of heat-resistant austenitic stainless steel (0.08%C-0.67%Si-1.8%Mn-24.3%Cr-0.21%Mo-19.3%Ni, wt. %). After solution annealed at 1100 °C for 30 minutes, test samples were isothermal annealed at 700 °C at different annealing times – from 1 to 1774 hours. After isothermal annealing, the microstructural and fractography analysis was carried out using scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectroscopy (EDXS). The stainless steel microstructures after solution annealing consisted of austenite and delta ferrite. It was found that the delta ferrite transforms to the sigma phase during isothermal annealing. At the same time the microhardness of the steel increases from 146 to 268 HV0.3. The initial precipitation of the sigma phase took place along austenite grain boundaries. Changes in the fracture surfaces, as well as sigma phase morphology were determined in case of longer annealing time.

Izvorni jezik
Engleski

Znanstvena područja
Metalurgija

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