Metastable austenitic CrNi steels undergo phase transformation when loaded or deformed plastically. In the current work a macroscopic and phenomenological constitutive model is presented to strain induced of austenite martensite. The approach based on previous works Olsen Cohen [1] & Stringfellow et al. [2]. kinetics modelled assumption that intersections shear bands in phase, act as potential ...

In this study, the effects of nitrogen addition on the production of ultrafine/nano grained AISI 201L stainless steel by advanced thermo-mechanical process were investigated. Cast samples were first homogenized at 1200 °C for 4 h, hot-rolled at 1100 °C and finally, solution-annealed at 1150 °C for 2.5 h. Unidirectional and cross multipass cold rolling at 25 °C was carried out to 90% reduction i...

Retained austenite (RA) transformation and its role in the mechanical properties of three low-carbon micro-alloyed quenching partitioning (Q&P) steels was investigated utilizing situ tensile tests electron microscopy. Meanwhile, RA’s strain-induced martensite (SIMT) analyzed discussed terms strengthening mechanism. The results show that ductility Q&P relies on size morphology RA. In add...

True stress (·)­true strain (3⁄4) relationships until just before fracture, i.e., the plastic deformation limit, were estimated by the stepwise tensile test and the Bridgman equation for various metals and alloys with different crystal structures. The estimated ·­3⁄4 relationships were different from the nominal stress­strain curves including the conventional tensile properties. In the relation...

This study demonstrates transformation-induced plasticity (TRIP) in conjunction with twinning-induced (TWIP) α + β titanium alloys by introducing metastable retained β-phase. By annealing at 850 °C followed water quenching, β-phase (∼25%) was obtained Ti–6Al–4V alloy. Stress-induced phase transformation the produced orthorhombic α′′-martensite associated (021)α′′ twinning, which significantly i...

Abstract Tensile deformation of superelastic NiTi shape memory alloy wires at temperatures above austenite finish temperature proceeds via stress-induced martensitic transformation followed by plastic oriented martensite. While tends to proceed in localized manner, martensite is considered be homogeneous. In this work, we have investigated strain localization patterns tensile tests on deformed ...

Abstract Effects of reduced (– 40 °C), ambient (20 and elevated (200 °C) deformation temperatures on the microstructure evolution strain hardening behavior two low-C thermomechanically processed high-manganese steels were studied. The was characterized by means scanning electron microscopy (SEM), backscatter diffraction (EBSD), transmission (TEM) techniques. temperature-dependent tendency auste...

this research intends to develop a method based on the artificial neural network (ann) to predict permanent earthquake-induced deformation of the earth dams and embankments. for this purpose, data sets of observations from 152 published case histories on the performance of the earth dams and embankments, during the past earthquakes, was used. in order to predict earthquake-induced deformation o...