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Technical Paper

Overcoming the Paradox of Strength and Ductility in a New Generation of AHSS

2016-04-05
2016-01-0357
The historical development of autobody steels has demonstrated a paradoxical relationship between strength and ductility, with increasing strength necessary for lightweighting commensurate with reductions in ductility necessary for cold formability. This in turn creates geometric constraints in part design and manufacturing, ultimately limiting usage of these higher strength steel grades in automobiles. Quench and tempering including variants such as quench, partitioning, and tempering are known approaches to increase strength while attempts to overcome the paradox have focused on increasing ductility through three distinct deformation mechanisms including; 1) shear band induced plasticity (SIP), 2) transformation induced plasticity (TRIP), and 3) twinning induced plasticity (TWIP).
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