Material parameter estimation for boron steel from simultaneous cooling and compression experiments

Abstract

In order to increase the accuracy of numerical simulations of the hot stamping process, reliable material data is crucial. Traditionally, the material is characterized by several isothermal compression or tension tests performed at elevated temperatures and different strain rates. The drawback of the traditional methods is the appearance of unwanted phases for some test temperatures and durations. Such an approach is also both time consuming and expensive. In the present work an alternative approach is proposed, which reduces unwanted phase changes and the number of experiments. The isothermal mechanical response is established through inverse modelling of simultaneous cooling and compression experiments. The estimated material parameters are validated by comparison with data from a separate forming experiment. The computed global response is shown to be in good agreement with the experiments.

Effect of Plastic Hot Deformation on the Hardness and Continuous Cooling Transformations of 22MnB5 Microalloyed Boron Steel

“…[1]: [13,14] B S ð CÞ ¼ 830 À 270 wt pct C À 90 wt pct Mn À 37 wt pct Ni À 70 wt pct Cr À 83 wt pct Mo…”

“…The purpose of this work is to describe the employed experimental methods to obtain the hardness and microstructural changes of prestrained and thermally treated microalloyed boron steel 22MnB5. [1][2][3] …”

Effect of cooling rate on the high strain rate properties of boron steel

“…During the forming process however, the cold tool forces the cooling rate of the sheet to be greater than 30 C/s, which results in a fully martensitic phase transformation of the sheet after it has been cooled as shown by the boron steel continuous cooling transformation (CCT) diagram in Fig. 1b [3][4][5][6].…”

Numerical Simulation on the Hot Stamping Process of an Automobile Protective Beam

“…The material of automobile protective beam was DP800/500 and its mechanical properties were shown in Tab.1 [7]. Mathematical model established by Pro/E software ( Figure 1) was introduced into DYNAFORM to mesh and set material, and the final mesh was shown in Figure 2.…”