硼对M2高速钢凝固组织的影响

INFLUENCE OF B ON SOLIDIFICATION STRUCTURES OF M2 HIGH SPEED STEEL

研究了微量硼对M2高速钢的凝固组织以及热处理过程中共晶碳化物国球化的影响及其机理发现，硼促进层片状M2C碳化物的形成；促进共晶碳化物的偏析，使碳化物量增加，层片变粗；促进共晶碳化物在高温加热时的断网和团球化.在高速钢中硼主要偏聚在晶界共晶碳化物上.

The influences of B on the solidification structures and the spheroidization of eutecticcarbide in M2 high speed steel are investigated. B favors the formation of lamellar M2C carbide. Bhas the effect of enhancing the segregation of eutectic carbides, thus increases the amount of eutecticcarbide and makes the flakes of carbide become coarse. B enhances the spheroidizaion of eutecticcarbide during heat treatment at high temperature. The majority of B agglomerates on the eutecticcarbides.