Lean duplex TRIP steel: Role of ferrite in the texture development, plastic anisotropy, martensitic transformation kinetics, and stress partitioning

Constitutive micromechanical behavior of transformation induced plasticity (TRIP) stainless steel (SS) alloys was investigated using high-energy synchrotron x-ray diffraction (S-XRD) and in-situ neutron techniques. First, four different were designed produced: (1) a metastable austenitic TRIP SS, (2) stable which is counterpart the (3) lean duplex SS with ferrite austenite phases, (4) SS. Then, effects chemical composition, microstructure, texture on plastic anisotropy, martensitic kinetics, residual stress concentration during tensile deformation investigated. The results show that governed by initial microstructure texture, has insignificant effect macroscopic properties phase kinetics despite R-values observed along loading directions. On other hand, interplay between partitioning among constituent phases plays critical role in micromechanics deformation, and, consequently, determines distributions martensite fraction stresses. alloy clearly shows large 1.8 GPa can concentrate 30% strain. In contrast, introduction load-sharing cost-effective significantly reduces phase, could improve formability high-strength steels.