Tool Steels in the Next Century (Eds. F.Jeglitsch, R.Ebner, H.Leitner), pp. 147-156, 1999

MODELING OF PHASE ARRANGEMENT EFFECTS IN HIGH SPEED TOOL STEELS

H.J. Böhm, A. Eckschlager and W. Han

CDL Functionally Oriented Materials Design,
Institute of Lightweight Structures and Aerospace Engineering,
TU Wien, Vienna, Austria


Abstract - Application relevant material properties of High Speed tool Steels (HSSs), e.g. stiffness and fracture toughness, are influenced to a considerable degree by the arrangement of the primary carbides in the steel matrix. Such arrangement effects can be studied by using the methods of micromechanics of materials, HSSs being treated as metal matrix composites consisting of elastic particles embedded in an elastoplastic matrix.
A three-dimensional modeling approach for HSSs based on a unit cell strategy is discussed. Emphasis is put on assessing the susceptibility of given microgeometrical arrangements to microscale damage initiation and growth, especially with respect to cleavage of carbides. Results pertaining to uniaxial mechanical loading of different microgeometries are presented.


(hjb,990929)