Published in Steel in Translation
The influence of multicyclic radiative and thermal treatment by an electron beam on the structure and properties of low-carbon steel is considered. With an optimal number of treatment cycles, the required structure and properties of the hardened surface are obtained. Radiative and thermal hardening by the proposed method modifies the working surfac...
Published in Metallurgical and Materials Transactions A
In this work, the Fisher’s formalism to describe the relationship between the volume fraction and the number per unit volume of martensite units is revisited and modified to take into consideration autocatalysis, the martensite morphology and the leading role of the midrib in the genesis of the microstructure. The modified model can predict the var...
Published in Journal of Materials Science
This study describes the correlation between microstructure and mechanical properties of an ultra-high-strength Fe86.7Cr4.4Mo0.6V1.1W2.5C4.7 (at.%) alloy manufactured under high cooling rates and pure conditions. The applied preparation conditions promote the formation of non-equilibrium phases such as martensite, retained austenite and special car...
Published in Metallurgical and Materials Transactions A
An alloy design concept leading to an improved ridging resistance in the transformable ferritic stainless steels is introduced. It is based on achieving a small γ-phase fraction at the ingot soaking temperature. The γ-phase fraction is then increased to a maximum value during the early stages of hot rolling. The nucleation of γ-phase islands in the...
Published in Technical Physics
The effect of long-term exposure of titanium nickelide in a dc nonuniform magnetic field on the phase transformation in it is studied. The magnetic field is shown to change the phase composition of an equiatomic Ti-Ni alloy and to substantially change its magnetic properties. This effect can be related to the appearance of magnetic Ti2Ni and Ni3Ti ...
Published in Metallurgical and Materials Transactions A
The main objective of the present work is to point out the respective roles of chemical driving force and stacking fault energy (SFE) in the occurrence of martensitic transformations in high-purity Fe-Cr-Ni alloys. For this purpose, the transmission electron microscope (TEM), X-ray diffractometer, thermal differential microanalyzer (TDA), and tensi...
Published in Metallurgical and Materials Transactions A
The three-dimensional atom probe (3DAP) is used to characterize the solute behavior at the initial nucleation stage of carbide that precipitates in a quench-temper processed multicomponent V-Nb microalloyed steel. The equilibrium (V,Nb)C phase does not precipitate directly from the ferrous matrix with martensite structure, whereas it is preceded by...
Published in Physics of the Solid State
An X-ray method has been considered for determining the volume fraction of the B19′ martensite in semi-product NiTi alloys, which is based on comparing the total integrated intensity of its strongest reflections with the total integrated intensity of reflections from the matrix B2 phase. It has been shown that the method enables one to determine th...
Published in Physics of the Solid State
The effect of severe plastic deformation by torsion (SPDT) in Bridgman anvils at a high pressure (6 GPa) on the physical properties and crystal structure of the shape memory alloy Ti49.5Ni50.5 has been studied. The behavior of the thermal expansion, electrical resistivity, absolute differential thermopower, Hall coefficient, magnetic properties, an...
Published in Journal of Materials Science
Indentation-induced two-way shape memory leads to pronounced temperature dependence of the depth of spherical indents made in martensitic NiTi shape-memory alloys. They are shallower when austenitic, and depth varies during both M → A and A → M transformations. If the impression is planarized, by metallographic grinding at T 107 J/m3, fully ~10% of...
