Abstract
Abstract Automotive industry asks for higher resistant steels to lighten parts and improve crash resistance. Keeping a good ductility while increasing tensile strength requires the development of new grades in which hardening mechanisms counteract the drop in elongation when enhancing mechanical resistance. This is mainly achieved with multiphase steels and completing dislocation hardening by twinning and martensite transformation during straining. This has led to high-strength steel families, some of them being already used in body in white (Dual Phase (DP) and TRIP steels). Others, still in development, will soon emerge on the market (Quenched and Partitioned (Q&P), medium-Mn steels or TWIP).
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