The effects of solidification microstructure and alloy elements on strip roll properties of high speed steel

摘要

Despite with application of the high speed steelfor abrasive resistance materials, the mechanism of theeutectic solidification has not been understood. Tomanufacture the high quality rolls. Carbides (species,morphology and distribution) and matrix (alloy composition,structure) must be controlled through alloy change,solidification process and heat treatment. In this work Fe-3%C-4%Mo4%Cr-X%W and V alloys were prepared toinvestigate the kind of carbides, morphology of microstructure,solidification process and its mechanical properties such ashardness and wear resistance. In the specimen of Fe-3%C-4%Mo-4%Cr with W content, eutectic carbide (M7C8) andeutectoid carbide (M3C) were crystallized at the interfacebetween the martensites. Also, as increasing W content, theamount of M3C carbide decreased, while the amount of M7C3carbide increased and was reduced in size. In Fe-3%C-4%Mo-4%Cr-X%V alloy, primary carbide (MC), eutectic carbide(M7C3) and eutectoid carbide (MC) in the ferrite, in Fe-3%C-4%Mo-4%Cr-X%V alloy, the matrix of all the specimens wasmartensite. With increase of V addition content, the amount ofM3C and M7C3 carbides decreased and the amount of MCcarbide increased. With increasing W. V contents except10%V, the overall hardness decreased because the hardness ofmatrix decreased, but wear resistance increased because thearea percentage of carbide increased.