THE COMPOSITION AND MORPHOLOGY OF INCLUSIONS IN FREE-CUTTING PLASTIC DIE STEEL 5CrNiMnMoVSCa
易切削塑料模具钢5CrNiMnMoVSCa中夹杂物的组成及形貌

The composition and morphology of inclusion in free-cutting plastic die steel 5CrNiMnMoVSCa have been studied.There are three types of sulfide:Linear MnS,oval(Mn·Ca)S solid dolutionwithout and with oxide nucleus.As Ca/S increases,the portion of the two la