Electroslag remelting effect on inclusions in 42CrMo steel and CCT curve study

The effect of electroslag remelting(ESR) on nonmetallic inclusions in an optimal component 42 CrMo steel was studied by BX51 M optical microscopy and Image Pro-Plus software,and the continuous cooling transformation(CCT) curve was measured on a Gleeble3000 thermal simulation machine. These results show that ESR can reduce the number and size of inclusions in steel samples and the inclusions removal ratio reaches 71.90%. The CCT curve of 42 CrMo steel was plotted according to the thermal expansion curve and microstructure. When the cooling rate is lower,the microstructure is ferrite,pearlite and bainite; but when the cooling rate is higher,there are martensite and a small amount of bainite.