Naslov
Effect of austenitization at 920 °C on the mechanical properties and microstructure of microalloyed steel

Autori
Gojić, Mirko ; Kosec, Gorazd ; Vodopivec, Franc ; Kožuh, Stjepan ; Vojvodić Tuma, Jelena ; Nagode, Aleš ; Kosec, Borut

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

Izvornik
Proceedings of XI Conference of Chemists, Technologists and Environmentalists of Republic of Srpska / Vukić, Ljiljana - Banja Luka : University of Banja Luka, Faculty of Technology, 2016, 119-124

ISBN
978-99938-54-67-8

Skup
XI Conference of Chemists, Technologists and Environmentalists of Republic of Srpska

Mjesto i datum
Teslić, Bosna i Hercegovina, 18.11.2016. - 19.11.2016

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
microalloyed steel, heat treatment, mechanical properties, microstructure

Sažetak
In this paper the effect of heat treatment on mechanical properties and microstructure for microalloyed high-strength low-alloy (HSLA) steel is investigated. Austenitization of the steel samples was performed at 920 °C for 15 minutes. After austenitization the quenching procedure was carried out in both, hot water (at 70 °C) and lead bath at 400 °C, following by cooling on air. Tensile strength, hardness and Charpy impact energy are tested. Microstructural analysis was carried out using optical and scanning electron microscopy (SEM). Values of tensile strength were in the range from 1160 to 1824 MPa, while values of hardness were in the range from 205 to 282 HV5. The microstructure of base material consisted of acicular ferrite and degenerated pearlite. The quenching in water from 920 oC produced a coarse microstructure with platelets of ferrite and lath primary martensite. The cooling in lead bath from 920 °C to 400 °C produced microstructure consisted from ferrite and bainite. Fractography analysis by SEM method showed that cleavage fracture occurred.

Izvorni jezik
Engleski

Znanstvena područja
Metalurgija

POVEZANOST RADA