フェライト-ベイナイト-マルテンサイト組織 (Triphase) 鋼の変形挙動および機械的性質(機械的性質)(<特集>高強度薄鋼板)

概要

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The effect of microstructure on the mechanical properties of multi-phase steels has been studied. The amount and nature of low temperature transformation products of the steels are changed through heat treatment and controlled cooling after hot rolling. Ferrite plus bainite steel has a superior stretch-flangeability and fatigue strength, and has an inferior strength-uniform elongation relationship when compared to ferrite plus martensite ("dual phase") steel. Introducing a small amount of martensite to ferrite plus bainite steel gives rise to a decrease in yield ratio and increase in work hardening rate. The microscopic examination shows that pearlite and martensite particles nucleate cracks easily and that the replacement of pearlite and martensite particles by more ductile bainite particles results in improved ductility and fatigue strength. The stretch-flangeability of the triphase steel is also improved by decreasing martensite particle size. It is concluded that ferrite-bainite-martensite (triphase) steel may be preferred to ferrite-martensite steel in automobile applications.
社団法人日本鉄鋼協会の論文
1982-07-01