1. Mirko Gojić, Croatia
It is known that Nitronic 60 stainless steel has good mechanical properties, corrosion resistance and resistance to adhesive wear. It this work results of microstructural analysis of Nitronic stainless steel are shown. This steel is a highly austenitic stainless steel for applications at elevated temperatures. In this investigation the Nitronic 60 steel composed from 16-18 % chromium, 8-9 % nickel, 7-9 % manganese, 3.5-4.5 % silicon and 0.08-0.18 nitrogen (wt. %). Before microstructural testing the samples are solution annealed (1020 oC/1 hour, followed cooling in water) and tempered at temperature of 750 oC in duration from 24 to 72 hours. Microstructural analysis was carried out by means of optical microscopy (OM), scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS) mehods. Microstructural analysis showed that the secundary particles are observed, expecially sigma phase. It was found that the formation of sigma phase is on grain boundaries and into grains. Content of chromium in sigma phase is in range from 21.2 to 56.9 % (wt. %).
Ključne rečitestttt :
SIMPOZIJUM A: Nauka materije, kondenzovane materije