COMPARISON BETWEEN PRECIPITATION KINETICS OF MANGANESE SULFIDE DURINGHOT COMPRESSION PROCESS WITH ONE AND 2 HOLDING TIME IN GRAIN-ORIENTEDELECTRICAL STEEL

The aim of this work is the study of manganese sulfide particles preci pitation (Fe-3%Si) after one and two holding time during hot compressi on process. Samples were heated at 1573K for 1800s. After the specimen s were cooled down to 1373 and 1173K hold for 32, 60 and 338s and the compression of 50% is applied during the holding time and then water q uenched, in the process with two holding rime, the first holding time is 60s (50% is applied), then the compression of 30% is applied (secon d holding time: 32, 60 and 338s), then water quenched. Grain size char acterization was carried out using OM. The study of comparison precipi tation has been carried out on the surface and the center of each samp le. For TEM characterization of MnS particles an extraction replica te chnique has been used. Image analyzer measured the particle diameter. Optical micrographs showed that the grain size decreases with the seco nd holding time process for the two temperatures on the two studied re gions. Hot compression process with two holding time provides more dis location and defects increasing the possibility of MnS particles preci pitate and providing higher MnS particle density.