SETT OCH ANORDNING FOR ATT VID AVKYLNING AV METALLER, T EX LEGERINGAR, SKILJA EKTA TERMISKA FASOMVANDLINGSEFFEKTER FRAN PSEUDOEFFEKTER

摘要

A method and apparatus for discriminating the thermal effect of phase transformation of metals and alloys in the process of their cooling, by measuring the temperature of a metal or alloy being cooled, the time elapsed from the beginning of the temperature measuring cycle and the duration of a temperature arrest occurring in the process of the metal or alloy cooling. The measured duration of the temperature arrest is compared with a threshold of the temperature arrest duration for making a decision ascertaining the occurrence of the thermal effect of phase transformation if the measured duration of the temperature arrest exceeds the threshold of duration of the temperature arrest. The method further includes measuring an increment of temperature of a metal or alloy being cooled relative to the maximum temperature recorded during the temperature measuring cycle, calculating a threshold of duration of the temperature arrest as a function of temperature of the metal or alloy being cooled, and measuring increments of these temperatures relative to the maximum temperature recorded during the temperature measuring cycle. The time elapsed from the beginning of the temperature measuring cycle is metered with the threshold value of the temperature arrest duration calculated for the moment of occurrence of temperature arrest, being used for the comparison.