ISSN 2594-5297
50º Seminário de Laminação — vol. 50, num.50 (2013)
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This paper deals with loading and temperature dependant fatigue parameters of working roll surface layer material. The research is performed on working rolls, where High Chromium Steel (HCrS) is used for roll’s shell material. Before fatigue testing, monotonic mechanical properties (ultimate compressive and ultimate tensile strength) are determined at different temperatures, using standardized testing procedures. Fatigue testing is performed on a servo – hydraulic testing machine with consideration of different loading ratios (R = 0, R = -1) and different initial temperatures of the specimens (20 °C, 600 °C). 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 research of fracture surfaces is performed using the Scanning Electron Microscope (SEM). Thereafter, the line profile Energy Dispersive X–ray Spectroscopy (EDS) is performed to determine content elements and carbides inside crystal grains and around grain boundaries. Experimental results presented in this paper will serve as a basis for further research related to fatigue behaviour of working rolls in hot strip mills made of HCrS.
This paper deals with loading and temperature dependant fatigue parameters of working roll surface layer material. The research is performed on working rolls, where High Chromium Steel (HCrS) is used for roll’s shell material. Before fatigue testing, monotonic mechanical properties (ultimate compressive and ultimate tensile strength) are determined at different temperatures, using standardized testing procedures. Fatigue testing is performed on a servo – hydraulic testing machine with consideration of different loading ratios (R = 0, R = -1) and different initial temperatures of the specimens (20 °C, 600 °C). 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 research of fracture surfaces is performed using the Scanning Electron Microscope (SEM). Thereafter, the line profile Energy Dispersive X–ray Spectroscopy (EDS) is performed to determine content elements and carbides inside crystal grains and around grain boundaries. Experimental results presented in this paper will serve as a basis for further research related to fatigue behaviour of working rolls in hot strip mills made of HCrS.
Palavras-chave
Experiments; High cycle fatigue; High chromium steel.
Experiments; High cycle fatigue; High chromium steel.
Como citar
Drobne, Matej;
Glodež, Srečko.
LOADING AND TEMPERATURE DEPENDANT FATIGUE PARAMETERS OF WORKING ROLL SURFACE LAYER MATERIAL
,
p. 1157-1168.
In: 50º Seminário de Laminação,
São Paulo,
2013.
ISSN: 2594-5297
, DOI 10.5151/2594-5297-24144
