Micromechanical characterisation of TRIP-assisted multiphase steels by in situ neutron diffraction

Abstract

The flow behaviour of the constitutive phases in multiphase steels, possibly exhibiting a mechanically-induced phase transformation (TRIP effect), is investigated using neutron diffraction conducted during uniaxial tensile loading. The BCC and FCC lattice strains of several specimens containing different amounts ferrite, bainite, martensite and metastable retained austenite are measured along elastic and plastic deformation. The validity of the measurements, as well as the strengthening resulting from the TRIP effect, are evaluated on the basis of overall mechanical equilibrium.

Acknowledgements

P. J. Jacques and S. Godet acknowledge the Fonds National de la Recherche Scientifique (Belgium). The authors are indebted to Arcelor Research for continuous support. This work was partly supported by the Belgian State, Prime Minister's Office, Federal Office for Scientific, Technical and Cultural Affairs within the framework of the PAI P5/08 project ‘From microstructure towards plastic behaviour of single- and multiphase materials’.