Tehnički vjesnik, Vol. 21 No. 4, 2014.
Prethodno priopćenje
Experimental determination of fatigue parameters of high chromium steel under different loading and temperature conditions
Matej Drobne
; Valji d.o.o., Železarska cesta 3, 3220 Štore, Slovenia
Nenad Gubeljak
orcid.org/0000-0002-3276-8431
; University of Maribor, Faculty of Mechanical Engineering, Smetanova 17, 2000 Maribor, Slovenia
Srečko Glodež
; University of Maribor, Faculty of Mechanical Engineering, Smetanova 17, 2000 Maribor, Slovenia
Sažetak
Fatigue investigation of high chromium steel (HCS) at different loading ratios (R = 0, R = –1) and different temperatures (20 °C, 600 °C) is presented in this paper. Before fatigue testing, monotonic mechanical properties (ultimate compressive and ultimate tensile strength) are determined at different temperatures, using standardized testing procedures according to DIN 50125 standard. Moreover Charpy impact tests at different temperatures were done with specimens that comply with the standard ISO 14556. Fatigue testing is performed on a servo – hydraulic testing machine with consideration of different loading conditions as described above. On the basis of the experimental results the S – N curves are constructed from which typical fatigue parameters (the fatigue strength coefficient σf’ and the fatigue strength exponent b) are determined. After fatigue testing a comprehensive investigation of fracture surfaces is performed using the Scanning Electron Microscope (SEM). Experimental results presented in this paper will serve as a basis for further investigations related to fatigue behaviour of real working rolls in hot strip mills made of HCS.
Ključne riječi
experiments; high chromium steel; high cycle fatigue
Hrčak ID:
126081
URI
Datum izdavanja:
15.8.2014.
Posjeta: 2.245 *