In-Situ Neutron Diffraction Study of the Deformation Behaviour of Two High-Manganese Austenitic Steels

Abstract:

In-situ neutron diffraction experiments under tensile loading were carried out to study the micromechanical behaviour of two iron-manganese based steels, a TWIP (twinning induced plasticity) steel with 30 wt% Mn and a TRIP steel (transformation induced plasticity) with 20 wt% Mn. The former was loaded to 31.3% strain and the latter to 20% strain. The 30 wt.% Mn steel had a fully austenitic microstructure which remained stable over the loading range studied, while stress induced austenite to α´- and ε-martensite transformations occur in the 20 wt.% Mn steel which initially contained an α´-martensite in addition to the austenite. The evolution of lattice strains under tensile loading differs between the two steels, reflected their different plastic deformation mechanisms. A stronger grain-orientation dependent behaviour is observed during deformation for the 20 wt.% Mn in contrast to the 30wt.% Mn steel.

• Periodical: Materials Science Forum (Volume 681)
• Pages: 474-479
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.681.474
• Online since: March 2011
• Authors: Ru Lin Peng, Xiao Peng Liu, Yan Dong Wang, Shu Yan Zhang, Yong Feng Shen, Sten Johansson
• Keywords: In Situ Neutron Diffraction, Micromechanical Behaviour, Mn-Steel, Phase Transformation, TRIP, TWIP

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