Community Research and Development Information Service - CORDIS

Abstract

In some grades of steel (with a high percentage of carbon or which are highly alloyed) cast in a continuous process, axial segregation in the shape of a V always appears in the centre of the product. Segregation in some grades (for example steel cord) can lead to the formation of hard phases such as martensite, which lead to the breakage of the product during cold wiredrawing. Segregation can be a serious problem in products that might be subject to fatigue such as ball bearings. To verify the internal quality of products with a tendency to form segregation's, action must be taken to control the traction of the paste centre which induces the circulation of the paste and/or liquid at the end of the solidification process. One of the techniques envisaged is to mechanically compress the product at the end of the solidification procedure in order to avoid segregation; a technique referred to as Mechanical Reduction and one which was first carried out in an industrial setting in Japan. This study looks at results obtained from mechanical reduction simulations. A thermomechanical model was also developed in order to study the influence of different configuration of thickness reductions on the distribution of stress.

Additional information

Authors: LAMANT J Y, IRSID (FR);LOPES C, IRSID (FR);KRAEMER R, IRSID (FR);JOLIVET J M, IRSID (FR);ROQUEL J, IRSID (FR);GRATACOS P, IRSID (FR)
Bibliographic Reference: EUR 18515 FR (1998) 56pp.
Availability: Available from OOPEC Sales agents
ISBN: ISBN 92-828-4883-3
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