Several microalloyed steels were intercritically annealed and then aircooled to room temperature or water-quenched to obtain different microstructures. The effects of the amount and the nature of low-temperature transformation products on the deformation behavior, stretch-flangeability and fracture-toughness after cup deep-drawing of multiphase sheet steels were examined. Bainite has a slight deleterious effect on strength-uniform elongation relationship but has a favorable effect on stretch-fiangeability and on fracture toughness after cup deep-drawing as compared with martensite. It is also suggested that ferritic-bainitic (-martensitic) steel may be preferred to " dual phase " steel in some complex pressings.
I. Nach der von den Verfassern erfundenen neuen Messungsmethode wurden die Reduktionsgleichgewichte
bei 921°, 821°, 721°, 622°, 522° und 422° untersucht.
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