Objectif
CONVENTIONAL HEAT TREATMENT IS GENERALLY APPLIED TO CASTINGS REMOVED FROM MOULDS AT AMBIENT TEMPERATURE. THIS RESEARCH WORK AIMS TO DEVELOP NEW TECHNIQUES FOR HEAT TREATING CAST NODULAR PIG-IRON WHICH HAS BEEN REMOVED FROM MOULDS WHILE HOT AT TEMPERATURES OF THE ORDER OF 1 000 DEGREES C, I.E. THE TEMPERATURE AT WHICH THE PIECE HAS JUST SOLIDIFIED. THIS INNOVATION ELIMINATES THE CONSUMPTION OF ENERGY CURRENTLY REQUIRED TO REHEAT THE PIECE - WHICH HAS BEEN REMOVED FROM THE MOULD AT 20 DEGREES C - TO A TEMPERATURE IN THE REGION OF 1 000 DEGREES C. THE PROJECT COVERS BOTH THE INDUSTRIAL APPLICATION OF THIS NEW TECHNOLOGY AND THE ESTABLISHMENT OF THE RELATION BETWEEN THE PROCESS CONDITIONS AND THE MECHANICAL PROPERTIES AFTER THE NEW HEAT TREATMENT.
THE STUDY HAS SHOWN THE FEASIBILITY OF THE NEW PROCESS. IT WAS POSSIBLE TO CARRY OUT AUSTENITIC HOLDINGS (FOR HOMOGENISING AND ANNEALING), IMMEDIATELY AFTER THE CAST IRON HAS BEEN REMOVED FROM THE MOULD WHILE HOT. ALL MATRICES COULD BE PRODUCED, BY CONTINUOUS COOLING OR AUSTEMPERING, JUST AS WITH CONVENTIONAL HEAT TREATMENT. THE MECHANICAL PROPERTIES MEASURED WERE CLOSE TO OR SOMETIMES MUCH BETTER THAN THOSE OBTAINED WITH CLASSICAL TREATMENT. AN INCREASED HARDNESS (DUE TO THE PRODUCTION OF PEARLITIC OR BAINITIC MATRICES) COULD THEREFORE RESULT IN SAVINGS RELATED BOTH TO REDUCED USAGE OF EXPENSIVE ALLOY ADDITIVES AND REDUCED ENERGY USAGE.
Thème(s)
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54700 Pont-à-Mousson
France