Effects of untransformed ferrite on Charpy impact toughness in 1.8-GPa-grade hot-press-forming steel sheets

Hot press forming (HPF) steel sheets are austenitized, press-formed, and rapidly cooled to obtain a martensitic microstructure with an ultra-high strength. When they are insufficiently austenitized, their microstructures might contain a small amount of untransformed ferrite, which can deteriorate im...

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Veröffentlicht in:	Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2017-11, Vol.707, p.65-72
Hauptverfasser:	Jo, Min Cheol, Park, Jaeyeong, Sohn, Seok Su, Kim, Seongwoo, Oh, Jinkeun, Lee, Sunghak
Format:	Artikel
Sprache:	eng
Schlagworte:	Austenitizing Charpy impact energy Charpy impact test Crack initiation Crack propagation Deformation Deformation mechanisms Ferrites Forming Fracture mechanics High strength Hot-press-forming (HPF) steel Impact analysis Impact strength Impact tests Martensite Martensitic stainless steels Metal sheets Microstructure Press forming Steel Strain localization Studies Untransformed ferrite
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