Plasticity and fracture modeling of quench-hardenable boron steel with tailored properties

Tom Eller, L Greve, M.T. Andres, M Medricky, A Hatscher, Vincent T. Meinders, Antonius H. van den Boogaard

Research output: Contribution to journalArticleAcademicpeer-review

65 Citations (Scopus)

Abstract

In this article, a constitutive model for quench-hardenable boron steel is presented. Three sets of boron steel blanks are heat treated such that their as-treated microstructures are close to fully martensitic, bainitic and ferritic/pearlitic, respectively. Hardness measurements show that the resulting blanks cover the full scope of possible hardness values, from 165 HV in the ferritic/pearlitic range to 477 HV in the fully hardened state. These three main grades provide the input data for a constitutive model consisting of an extended Swift hardening law and a stress triaxiality and Lode angle dependent fracture criterion. The hardening behavior of each grade is determined using standard tensile tests at quasi-static strain rates. The strain-based fracture criterion is calibrated using four different flat fracture samples. The behavior of intermediate hardness grades is approximated by piecewise linear combination of the three calibrated constitutive models. A newly developed tapered tensile test specimen featuring a hardness transition zone in the gauge section is used to verify the model at hand. A four point bending test of a top hat section of intermediate hardness is used to verify the model for complex loading conditions.
Original languageEnglish
Pages (from-to)1211-1227
Number of pages17
JournalJournal of materials processing technology
Volume214
Issue number6
DOIs
Publication statusPublished - 3 Jan 2014

Keywords

  • METIS-302292
  • IR-89329

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