A Review: Production of Third Generation Advance High Strength Steels

To fulfill the requirement for steel with higher strength while retaining its formability, advanced high strength steels (AHSS) was developed. Several authors worked on the first generation AHSS steels with Dual phase structure and successfully achieved high strengths as compared to conventional counter-parts but could not achieve good formability. Several authors worked to overcome this problem and substantially improved the ductility and strength by forming second generation AHSS. However, DP steels were not formed (in second generation). Second generation steels (included ASS, TWIP steels etc.) were dependent on expensive alloy additions and were not cost effective. Authors became successful in achieving good strength and ductility but because of alloying, the weldability suffered. Finally, a few authors have reported their work on third generation AHSS, where first generation dual phase steels have been modified through suitable alloy additions to improve formability, strength and toughness. Work has been reported where carbon has been reduced to improve weldability. There is extremely limited work has been done for production of dual phase multipurpose steels with controlled cooling.