Abstract
Tensile deformation behavior of two transformation-induced plasticity (TRIP)–assisted multiphase steels with slightly different microstructures due to different thermomechanical treatment conditions applied was investigated by in-situ neutron diffraction. The steel with lower austenite volume fraction (f γ = 0.04) and higher volume fraction of needlelike bainite in the α-matrix exhibits higher yield stress (sample B, 600 MPa) but considerably lower elongation in comparison to the steel with higher austenite volume fraction (f γ = 0.08), granular bainite, and polygonal ferrite matrix (sample A, 500 MPa). The neutron diffraction results have shown that the applied tensile load is redistributed at the yielding point in such a way that the retained austenite bears a significantly larger load than the α matrix during the TRIP-assisted steel deformation.
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