Nanophase Refinement and Strengthening During Stamping of 3rd Generation AHSS

Paper #:
  • 2018-01-0628

Published:
  • 2018-04-03
Abstract:
Extensive development of advanced high strength steel (AHSS) over the past decade is driven by the demand from the automotive industry for stronger materials that can enable lightweighting to meet increasing fuel efficiency requirements. However, achievement of higher strength in many AHSS grades comes with reduction in ductility, leading to geometric constraints on formability which limit their application. In March 2016, NanoSteel commercially launched a new type of 3rd Generation AHSS which exhibits a compelling combination of tensile strength (~1200 MPa) and high elongation (>40%) providing auto designers new opportunities for lightweighting without compromises in part geometry. Previously, a specific structural evolution through a mechanism called Nanophase Refinement and Strengthening (NR&S) has been demonstrated for NXG™ 1200 in laboratory samples. In this paper, the role of the NR&S mechanism in enabling high cold formability of commercially-produced NXG™ 1200 sheet steel will be examined. The NR&S mechanism is shown to be commensurate with increases in both yield and ultimate tensile strength during the stamping process and in the final stamped part. Both non-destructive and destructive methods were utilized to analyze the stamped part and the resulting properties and performance from stamping will be discussed and compared to the properties of the initial blank.
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