Process – structure – property relations in DP800 investigated using representative volume elements

Materials research proceedings, vol. 54, pp. 995–1004

Abstract

Abstract. Dual-phase (DP) steels play a crucial role for various applications due to their good balance of formability and strength. This paper explores the influence of the pass reduction during cold rolling on the microstructure and mechanical properties of a DP800 steel. A ferritic-pearlitic base material was cold rolled with varying pass reductions, followed by intercritical annealing at a constant temperature. Microstructural characterization was performed using light optical microscopy and electron backscatter diffraction, while tensile tests provided insights in the macroscopic mechanical property. Statistically representative volume elements (sRVE), generated with the in-house DRAGen RVE-generator were employed in conjunction with crystal plasticity simulations to analyze the strain partitioning and the damage behavior. Results show that pass reduction during cold rolling significantly affects microstructure and strain partitioning, influencing damage tolerance and therefore also the formability. Increasing the number of passes leads to more homogenous stress and strain distribution with less damage. These findings highlight the importance of process design in optimizing DP steel damage tolerance.

Authors 1

1. Niklas C. Fehlemann corresponding Aachen Institute of Metal Forming

   RWTH Aachen University

   Affiliation as printed

   Institute of Metal Forming, RWTH Aachen University, Intzestraße 10, 52072 Aachen, Germany