Abstract Conditions for the formation of microconcentration inhomogeneities in Fe–Ni alloys, which can decrease their invar characteristics, are determined. The nickel separation be reached course short-term annealing as a result deformation-induced segregation, redistribution between martensite and austenite ferrite well.

A new β-metastable Ti-alloy is designed with the aim to obtain a TWIP alloy but positioned at limit between TRIP/TWIP and dominated regime. The exhibits large ductility combined an elevated stable work-hardening rate. Deformation occurring by formation multiplication of {332}<113> twins evidenced followed in-situ electron microscopy, no primary stress induced martensite observed. Since microstr...

Deformation-induced martensitic transformation as the basis of a hardening process is dependent, among others, on stress state. In applications such cryogenic cutting, where hardened subsurface can be produced in metastable austenitic steels, different states exist. Furthermore, cutting typically occurs at high strain rates greater than 103s?1. order to gain deeper insight into behavior steel (...

In the present work, hydrogen/material interaction with two austenitic steel types, created via a completely different alloying strategy, is investigated. The steels include 304L stainless (ASS) and 18Mn-0.6C twinning-induced plasticity (TWIP) steel. Constant extension rate tensile tests are performed to evaluate influence of hydrogen on deformation fracture mechanisms. A reference condition wi...

The objective of this work was to study materials subjected to external loading where alternative deformation mechanisms are available to generate strains. In the case of shapememory and superelastic NiTi, these mechanisms are twinning and stress-induced phase transformation, respectively. Superelastic NiTi (51.0 at.% Ni) reinforced with 0, 10 and 20 vol.% TiC particles was fabricated by Hot Is...

To clarify the contribution of martensite increase to work-hardening during transformation-induced plasticity (TRIP), changes in local strain distribution with tensile deformation were investigated for dual-phase steels different volume fractions ferrite using precise marker method. Particular attention was paid and stress bearing by deformation. The method is especially useful analysis multiph...

Steels with a mixed microstructure of allotriomorphic ferrite, bainitic ferrite, retained austenite and martensite have potentially good combinations of high strength and formability. This work describes a kinetic theory for the formation of bainite in steels where the precipitation of carbides is suppressed. The theory is based on the mechanism of transformation. It includes, for example, a nu...

Role of deformation-induced martensite in the transformation-induced plasticity (TRIP) metastable austenitic steels was studied by examining effects temperature on tensile properties Fe–18%Cr–6%Ni–0.2%N–0.1%C (6Ni–0.2N–0.1C) steel. The obtained tests at various temperatures between 123 and 373 K were compared with those SUS304 0.2% proof stress, strength, uniform elongation 6Ni–0.2N–0.1C steel ...

Although high carbon martensitic steels are well known for their industrial utility in high abrasion and extreme operating environments, due to their hardness and strength, the compressive stability of their retained austenite, and the implications for the steels' performance and potential uses, is not well understood. This article describes the first investigation at both the macro and nano sc...