圧延ロール用高炭素ハイス系合金の凝固機構

抄録

The phase diagram and the solidification processes are investigated on a series of alloy specimens containing 5%Cr. 5%Mo, 5%W, 011%V and 1.04.4%C. δ, γ, MC and M₃C appeare as primary phases, and eutectics of γ+MC and γ+ M₃C crystallize at boundary compositions between liquidus surfaces of the constituent phases. The compositional extent of each liquidus surface is similar to those of Fe-V-C and Fe-5%Cr-V-C alloy system. M₂C and M₇C₃ crystallize as eutectic carbides because of segregation of Mo, W and Cr to residual liquid, though they don't appear in the diagram. The species and amount of carbides of this alloy system are estimated on the basis of the diagram and the analysis of redistribution of alloying elements.