A.20CrMnMoB.9SiCrC.60Si2MnD.40Cr
A.15CrMoB.W6Mo5Cr4V2C.40CrMnMoD.1Cr18Ni10Mo2Ti
A.致密度大B.配位數(shù)大C.總的間隙大D.間隙半徑大