ベイナイト組織を有する熱間鍛造型用鋼の機械的性質について

概要

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Characteristics of mechanical properties of medium carbon Ni-Cr-Mo-V forging die steel with bainite microstructure was investigated and following results were obtained;(1) Impact property at elevated temperature:Impact property of lower bainite at elevated temperature (from 100°C up to 600°C) is superior to that of tempered martensite with similar strength, on the other hand, impact property of upper bainite is similar to that of tempered martensite.(2) Tensile ductility:Tensile ductility of lower and upper bainite is superior to tempered martensite.(3) Notch tensile strength:Notch tensile strength of lower bainite is superior to tempered martensite, but that of upper bainite is similar to or slightly better than that of tempered martensite.Consequently, medium carbon Ni-Cr-Mo-V steel with bainite microstructure is expected to be excellent for forging dies.
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