The formation of stress-induced martensite in superelastic NiTi was studied by neutron diffraction during uniaxial compressive loading and unloading. The respective phase fractions were determined as a function of the applied stresses using a Rietveld refinement with a March–Dollase texture formulation. Before loading, the specimen was fully austenitic. At the highest applied stress of 2625 MPa...

A Cu precipitation-mediated austenitic transformation during ageing treatment of a 15–5 PH stainless steel is revealed through atom probe tomography, in situ synchrotron X-ray diffraction and computational thermodynamics kinetics. The proposed to occur the pathway: precipitation at martensite/retained austenite interfaces or martensite lath boundaries ? partitioning stabilizing elements towards...

The X-ray and magnetometry methods were used to study α-γ transformation mechanisms on heating quenched Fe-22.7 wt.% Ni-0.58 wt.% С alloy. Variation of heating rate within 0.03-80 K/min allowed one to switch from diffusive to non-diffusive mechanism of the α-γ transformation. Heating up primary austenitic single crystal specimen at a rate of less than 1.0-0.5 K/min has led to formation of aggre...

Rare-earth elements have been widely used in the field of functional materials, but their effects on cold-stamping formability high-strength automotive steels rarely studied. In this paper, effect trace rare-earth element Ce microstructure and properties cold-rolled medium manganese steel after ART (austenite-reverted transformation, ART) annealing was The experimental observed using SEM, mecha...

In the present work, Fe-5Mn-2Al-0.1C (wt.%) and micro-alloyed Fe-5Mn-2Al-0.1C-0.1Nb-0.2V medium Mn steels were processed by a novel flash-austenite-reverse-transformation (ART) annealing. The core-shell Mn-gradient in austenite was observed compositionally characterized at near-atomic scale using atom probe tomography (APT). Compared with conventional ART annealing, flash-ART process doubled fr...

An extra low carbon martensitic stainless steel with 16% ultrafine grained metastable reverted austenite was subjected to uniaxial tensile testing and investigated in-situ energy-dispersive synchrotron X-ray diffraction (XRD) electron backscatter (EBSD) reveal the complex interplay between stress, strain transformation. In-situ XRD demonstrated that, upon surpassing yield strength, fraction of ...

The standard heat treatment of PH 13-8 Mo maraging steels consists solution annealing and subsequent aging. Herein, it is investigated how an additional intercritical step prior to aging affects the microstructure, and, consequently, mechanical properties a steel. In situ techniques by means high-temperature electron backscatter diffraction X-ray are applied study microstructural changes during...