Due to recent concern about allergic and toxic effects of Ni ions released from TiNi alloy into human body, much attention has been focused on the development of new Ni-free, metastable beta-type biomedical titanium alloys with a reversible phase transformation between the beta phase and the alpha'' martensite. This study investigates the effect of the stress-induced alpha'' martensite on the m...

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 features of martensite transformation in Fe (31 32)% Ni melt-quenched alloys are considered. The meltquenching was realized by spinning technique with variable parameters. The influence of the melt-quenching on structural and kinetics transformation parameters is revealed. In particular Ms point is shown to decrease but volume percentage of athermal martensite is found to be invariable with...

Martensitic transformation associated with a tensile deformation of CuAlMn single crystals in [loo] direction was studied using in-situ transmission electron microscopy. Stress/strain curves obtained during pseudoelastic deformation of microscopic samples were slightly different fiom bulk ones due to martensite formation in the stage of stress increase and a permanent deformation during the fir...

Samples of 17-4PH high-strength steel were processed by selective laser melting (SLM) and solution-processed. The effects the solution temperature on microstructure mechanical properties samples studied. is primarily composed martensite, with a small number austenite phases, contains many dislocations. After treatment, grain size gradually increased, yielding typical martensite. subjected to an...

This manuscript aims to present an overview of quenching and partitioning (Q&P) heat treatment usually applied transformation-induced plasticity (TRIP) duplex steels (DP). TRIP DP are the first generations advanced high-strength (AHSS). AHSSs multiphase microstructures that ensure advantageous combination strength ductility. The Q&P process obtain a mixed microstructure with martensite ...

The mechanical properties and microstructural developments of 321 stainless steel during thermomechanical process were investigated. The repetitive cold rolling and subsequent annealing were conducted to achieve nanocrystalline structure in an AISI 321 stainless steel. Heavily cold rolling at −20°C was conducted to form martensite in metastable austenitic steel. The process was followed by anne...

The possibility of producing bainite at low temperatures by suppressing transformation using substitutional solutes has been investigated, as an alternative to using large carbon concentrations to achieve the same purpose. It is found that although transformation temperatures can indeed be suppressed in this way, the difference between the bainite and martensite start temperatures diminishes. T...