Simulation of Mechanical Properties of ULCB_Mn Steel Sheets Having a Composite Microstructure

  1. Prof. Yves Bréchet
  1. Andrzej Kazimierz Lis,
  2. Cezary Kolan and
  3. Leopold Jeziorski

Published Online: 19 DEC 2005

DOI: 10.1002/3527606157.ch22

Microstructures, Mechanical Properties and Processes - Computer Simulation and Modelling, Volume 3

Microstructures, Mechanical Properties and Processes - Computer Simulation and Modelling, Volume 3

How to Cite

Lis, A. K., Kolan, C. and Jeziorski, L. (2000) Simulation of Mechanical Properties of ULCB_Mn Steel Sheets Having a Composite Microstructure, in Microstructures, Mechanical Properties and Processes - Computer Simulation and Modelling, Volume 3 (ed Y. Bréchet), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527606157.ch22

Editor Information

  1. Institut Nat. Polytechnique de Grenoble, L.T.P.-C.M. ENSEEG, BP75, Domaine Universitaires, 38402 Saint Martin D'Hères Cedex, France; Tel.: 0033–76–82 6610; Fax: 0033–76–82 6644

Author Information

  1. Technical University of Częstochowa, Institute of Materials Engineering, Ami Krajowej 19, 42-200 Częstochowa, Poland

Publication History

  1. Published Online: 19 DEC 2005
  2. Published Print: 20 APR 2000

Book Series:

  1. EUROMAT 99

ISBN Information

Print ISBN: 9783527301225

Online ISBN: 9783527606153

SEARCH

Keywords:

  • microstructures;
  • computer simulation;
  • mechanical properties;
  • ULCB_Mn steel sheets;
  • composite microstructure

Summary

Application of thermomechanical treatment to produce “ in situ” composite material from ultra-low carbon high manganese bainitic steel (ULCB_Mn) and numerical prediction of mechanical properties of sheets have been presented. The composite microstructure was created by formation of thin elongated islands of bainite and lath martensite mixture (BM) as reinforcing dispersoids in cold deformed ultra-low carbon ferrite matrix. The stability of that microstructure was evaluated after annealing.

Simulation of formation of composite microstructure was confirmed by dilatometric studies of steel annealed in (α+γ) range and fast cooled to produce different amount of BM islands. The precise volume fraction of BM phases has been established by quantitative method and dilatometry. Quantification of dual-phases microstructure was performed by computerized Joyce Loebel optical microscope apparatus. The effect of volume fraction of BM islands, their stereometrical characteristics and amount of cold deformation of steel on tensile properties have been analyzed.

It has been shown that yield strength in the range of 600÷900 MPa can be achieved with satisfied ductility up to 16 % for strips after annealing, which have typical discontinuous fibers (BM islands) and metal matrix (Ferrite) composite microstructures. The equations for physical modeling of the microstructure- properties- relationships were given. Prolonged time of annealing up to 6000 seconds at 723 K does not greatly change the main features of DF-MMC (discontinuous fibers metal matrix composite) microstructure and tensile properties of the investigated steel.