Nanostructured bainite is a novel ultra-high-strength steel-concept under intensive current research, in which the optimization of its mechanical properties can only come from a clear understanding of the parameters that control its ductility. This work reviews first the nature of this composite-like material as a product of heat treatment conditions. Subsequently, the premises of ductility beh...

It is well known that the Fe based alloys can exhibit shape memory effect due to the y to E martensitic transformation. The effect may not be as striking as observed in the NiTi alloy but it might become attractive fkom the practical point of view. In this work, two compositions of Fe-Cr-Ni-Mn-Si(-Co) stainless steel based shape memory alloy, prepared by the VIM technique, will be presented. Th...

A new class of martensitic stainless steel, namely 06Cr15Ni4CuMo, with applications in marine engineering, was processed by using selective laser melting (SLM). body-centered cubic microstructure observed, and the compared wrought 410 steel. The SLM-processed sample showed a hardness 465 ± 10 HV0.5, which nearly 115 HV0.5 less than counterpart. Similarly, improved YS UTS, sample. However, reduc...

We report on the effects of annealing on the martensitic phase transformation in the Ni-based Heusler system: Mn50Ni40Sn10 and Mn50Ni41Sn9 powder and Co50Ni21Ga32 nanoparticles. For the powdered Mn50Ni40Sn10 and Mn50Ni41Sn9 alloys, structural and magnetic measurements reveal that post-annealing decreases the martensitic transformation temperatures and increases the transition hysteresis. This m...

Statistica1 thermodynamics of martensitic transformation is developed in the frame of the self-consistent field approximation. The accommodation mechanisms of the parent phase to the martensitic variant growth are described by the three order parameters. The latters reflect the concentration and the orientation of the martensitic phase and the dislocation density at the interphase boundaries. S...

The study systematically compares the low-cycle fatigue (LCF) behaviors of novel martensitic steel (22MnSi2CrMoNi) and maraging (00Ni18Co9Mo4Ti). Results show that two types tested have a similar cyclic deformation behavior. softening resistance 22MnSi2CrMoNi is slightly inferior to 00Ni18Co9Mo4Ti at low total strain amplitude. However, gap gradually disappears with increase At same plastic amp...