Preliminary communication

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

Abstract

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.

Keywords

experiments; high chromium steel; high cycle fatigue

Hrčak ID:

126081

URI

https://hrcak.srce.hr/126081

Publication date:

15.8.2014.

Article data in other languages: croatian

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