Effects of Electromagnetic Stirring on the Solidified Microstructure of Martensite Stainless Steel

摘要

In this text, the effect of electromagnetic stirring (EMS) on the quantities of the martensite stainless steel ingots was investigated by static casting experiment. The results of the experiment show that to compared with the traditional cast, the EMS can obviously improve the quantities of the martensite stainless steel ingots. By the EMS technique, the ratio of equiaxed grains greatly increased and when the current remains content, the ratio of equiaxed grain increases first and then decreases as the stirring frequency increasing. There is a maximum value at the 5Hz. With the EMS the carbon and the chromium in the ingots are better distributed. The segregation of C and Cr is inhabited. And also with the EMS, the grains of the martensite stainless steel ingots become finer and more homogeneity; consequently the appearance and distribution of the troostite in the ingots obviously changed: without the EMS the troostite distributes in net shape or block shape and with the EMS, the troostite distributes in the matrix dispersedly.