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The Effect of Carbides Orientation in NC11 Steel on Scratch Susceptibility of Die Inserts Used to Press Stampings for Refractory Shapes

Orłowicz A. W., Mróz M., Tupaj M., Trytek A., Kupiec B., Korzeniowski M., Sondej K., Kozak L.

Archives of Foundry Engineering

2016

Vol. 16, iss. 2

95--98

NC11 steel, in view of the specificity of its manufacturing process, is characterised with band-like orientation of carbides. Depending on the direction of cutting the material for the inserts out of commercially available steel products, carbide bands can be oriented in parallel or perpendicularly to the direction in which aggregate grains move in the process of pressing stampings. It has been found that in case of scratches made in direction perpendicular to carbide bands, depth of the scratches is less than this observed when scratches are made in direction coinciding with prevailing orientation of carbide precipitates.

Experimental-Numerical Model of the Initiation and Propagation of Cracks in Die Inserts

Piekło J., Maj M., Pysz S.

Archives of Foundry Engineering

2013

Vol. 13, iss. 1 spec.

107--110

The aim of the research presented in this paper was to develop an experimental - numerical model for predicting the life of die inserts. For this purpose, using FEM, the temperature and stress fields in the insert during stable operating cycle of a die casting machine were determined. The study of WCL steel, of which inserts are made, included fatigue tests and tests from the range of fracture mechanics. From the results obtained, a relationship was derived between the number of the die casting machine operating cycles and the propagation speed of cracks formed on the insert working surface.