Abstract
Specimens of a UNS S31803 duplex stainless steel were (i) single low temperature plasma nitrided and (ii) high temperature gas nitrided, at 1200°C and low temperature plasma nitrided. Plasma nitriding treatments were carried out at 400°C by 20 h, in a 75%N2+25%H2 atmosphere, duplex surface treatment. The microstructure of the as received material is composed by ferrite and austenitic stringers, aligned in the rolling direction. Light optical microscopy (LOM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and electron-backscattered diffraction (EBSD) were used to characterize the microstructure. The duplex surface treatment led to the formation of 550 μm thick fully austenitic layer at the surface of the specimens, by transformation of ferrite stringers, and the subsequent plasma nitriding led to the formation of a homogeneous expanded austenite layer, 1144 HV. The single plasma nitrided (LTPN) layer was composed by expanded ferrite (αn) and expanded austenite (γn), with microhardness of 1509 HV and 1362 HV, respectively.
Original language | English |
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Title of host publication | Materials Science and Technology Conference and Exhibition 2014, MS and T 2014 |
Publisher | Association for Iron and Steel Technology, AISTECH |
Pages | 1465-1472 |
Number of pages | 8 |
Volume | 3 |
ISBN (Electronic) | 9781634397230 |
Publication status | Published - 1 Jan 2014 |
Event | Materials Science and Technology Conference and Exhibition 2014, MS and T 2014 - Pittsburgh, United States Duration: 12 Oct 2014 → 16 Oct 2014 |
Conference
Conference | Materials Science and Technology Conference and Exhibition 2014, MS and T 2014 |
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Country/Territory | United States |
City | Pittsburgh |
Period | 12/10/14 → 16/10/14 |
Keywords
- Duplex stainless steel
- Duplex treatment
- High temperature gas nitriding
- Low temperature plasma nitriding
ASJC Scopus subject areas
- Energy Engineering and Power Technology
- Materials Science(all)