Determining mechanical characteristics of steel sample - requires control of cooling and heating to obtain required cooling law

摘要

The structure and mechanical characteristics of a steel sample depends on the speed of cooling and the cooling law. A sample is cooled by a flow of inert gas and heated by a modulated radiation system to obtain the required law. The temperature of a sample is sensed by a thermocouple (15) and a regulator (12) generates a difference value from a demand value from a curve follower (11). The regulator provides a signal for a power unit (13) which acts on tungsten filament lamps (3, 4) located in front of the reflectors (5, 6) which reflect heat onto the sample. This action corrects the temperature difference. The curve follower also provides a signal for a sharing system (14) which controls electrovalues (9, 10) to allow helium to be blown onto the sample from several jets (8). This action takes place when the heating phase is complete to achieve the required cooling law.