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2013
Conference Paper
Titel
Influence of Mg-PSZ particle size on the low cycle fatigue behaviour of steel matrix composites
Alternative
Einfluss der Mg-PSZ-PartikelgrĂ¶ĂŸe auf das niederzyklische ErmĂ¼dungsverhalten von Stahlmatrixkomposits
Abstract
Metal matrix composites (MMCs) are considered as promising materials because of their interesting properties in terms of strength and wear resistance combined with a reasonable ductility. The development of MMCs based on high-alloyed austenitic steels with TRIP- (transformation-induced plasticity) and/or TWiP- (twinning-induced plasticity) effect reinforced with MgO-partially stabilized zirconia gives the possibility to combine materials which show deformation-induced and stress-assisted martensitic transformations. In the present work, TWIP steel matrix composites reinforced with 10 vol% MgO-partially stabilized zirconia (Mg-PSZ) were produced using the hot pressing technique. Mg-PSZ powders with different particle size distributions were used as reinforcing phase. The steel matrix is m ade of the high-alloyed austenitic steel grade 16Cr-6Mn-9Ni (nominal concentration in wt%) which can show under certain conditions the TWIP-effect MMCs and the unreinforced steel were cyclically deformed under total strain control in order to study the influence of the Mg-PSZ particle size on the low cycle fatigue behaviour of the TWIP steel matrix composites including the discussion of cyclic hardening and softening and consequences on fatigue lives. The microstructural evolution under cyclic loading was characterized using scanning electron microscopy techniques.
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