The influence of simple and complex loading on structure changes in two-phase titanium alloy

Bylja, Olga; Васин, Р. А.; Ermachenko, A. G.; Karavaeva, M. V.; Muravlev, A.V.; Chistjakov, P.V.

doi:10.1016/s1359-6462(96)00463-0

Cited by 8 publications

(5 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Изменения вида нагружения от РКУП к последующей прокатке позволяет интенсифицировать процесс структурной перестройки за счет активации новых систем скольжения при смене схемы главных напряжений и деформаций [2,17]. Это приводит к формированию более мелкозернистой однородной структуры по сравнению с просто прокаткой (без предварительной деформации РКУП).…”

Section: результаты исследования и обсуждениеunclassified

Effect of combined loading on the microstructure and microhardness of austenitic steel

Karavaeva¹,

Abramova²,

Enikeev³

et al. 2017

LoM

View full text Add to dashboard Cite

Increasing the strength of low carbon austenitic steels, which are not hardened by quenching, is possible due to the formation of ultrafine-grained (UFG) structure during severe plastic deformation (SPD). However, the most notable hardening during SPD is observed at the initial stages of processing, after which the hardening rate decreases markedly. One of deformation parameters significantly affecting the structure is loading path. Using non-monotonic loading allows one to activate new glide systems resulting in an accelerated process of UFG structure formation and the resulting structures are characterized by high dislocation density and smaller grain sizes. In this work, non-monotonic loading by a combination of two methods, equal channel angular pressing (ECAP) and subsequent rolling with varying reduction rate, was used. It has been shown that the combination of SPD method (ECAP) and rolling leads to an additional increase in the microhardness of UFG austenitic steel. Additional hardening is associated with features of the microstructure formed under combined loading. The structure is characterized by a fine grain size and high density of dislocations compared with the structure after rolling or ECAP. It is shown that during deformation the microstructure changed from banded structure to a subrgrain-granular one. For the samples subjected to ECAP before rolling this process occurs at a less rolling strain. Furthermore, after the combined loading a noticeable volume fraction of twins in the microstructure was observed as compared to their rather small amount after ECAP. With a strain increase during rolling the rate of microhardness growth slows down.

show abstract

Section: результаты исследования и обсуждениеunclassified

Effect of combined loading on the microstructure and microhardness of austenitic steel

Karavaeva¹,

Abramova²,

Enikeev³

et al. 2017

LoM

View full text Add to dashboard Cite

show abstract

“…That means that It can be seen from the results of simulation that the stress-strain curve obtained has hardening in the first part followed by softening with a gradually decreasing slope. Such mechanical behavior is typical for Ti alloys deformed in nearto-superplastic regimes [15]. However for practical use of this model in real technological simulations the question of experimentally obtaining the parameters of the model must be solved.…”

Section: Simulationmentioning

confidence: 99%

Modelling of active transformation of microstructure of two-phase Ti alloys during hot working

Bylja¹,

Pradhan²,

Yakushina³

et al. 2014

LoM

View full text Add to dashboard Cite

Being very strong and of limited ductility, Ti alloys require special techniques to manufacture the parts with complex shapes. Many of these technologies are based on superplastic and near-to-superplastic deforming. In these processes the transformation of the microstructure of the material can be very significant and can lead to changes in the mechanical properties of the material during deformation. Because of this an appropriate description of the correlation between mechanical loading, changes in microstructure and mechanical behavior of material is required. A phenomenological scalar model with an internal variable based on a statistical description of microstructure is proposed and used for simulation of the high temperature deformation of Ti-6Al-4V alloy. The problems of obtaining the parameters of the model and sensitivity of the model to the accuracy of this process are discussed.

show abstract

“…The latter has an effect on both the kinetics of microstructural evolution and the homogeneity of the produced microstructure. For example, when studying the microstructure transformation of Ti alloys with a change of the deformation path, it was shown that the substitution of a monotonic loading with an essentially non-monotonic one enabled activation of new slip systems and thus intensified the process of microstructural refinement [8,9]. With respect to SPD processing, it was demonstrated that the so-called route of equal-channel angular pressing (ECAP) has a great effect on structural evolution [10,11].…”

Section: Introductionmentioning

confidence: 99%

Superior Strength of Austenitic Steel Produced by Combined Processing, including Equal-Channel Angular Pressing and Rolling

Karavaeva

Abramova

Enikeev

et al. 2016

Metals

View full text Add to dashboard Cite

Enhancement in the strength of austenitic steels with a small content of carbon can be achieved by a limited number of methods, among which is ultrafine-grained (UFG) structure formation. This method is especially efficient with the use of severe plastic deformation (SPD) processing, which significantly increases the contribution of grain-boundary strengthening, and also involves a combination of the other strengthening factors (work hardening, twins, etc.). In this paper, we demonstrate that the use of SPD processing combined with conventional methods of deformation treatment of metals, such as rolling, may lead to additional strengthening of UFG steel.In the presented paper we analyze the microstructure and mechanical properties of the Cr-Ni stainless austenitic steel after a combined deformation. We report on substantial increases in the strength properties of this steel, resulting from a consecutive application of SPD processing via equal-channel angular pressing and rolling at a temperature of 400 • C. This combined loading yields a strength more than 1.5 times higher than those produced by either of these two techniques used separately.

show abstract

The influence of simple and complex loading on structure changes in two-phase titanium alloy

Cited by 8 publications

References 2 publications

Effect of combined loading on the microstructure and microhardness of austenitic steel

Effect of combined loading on the microstructure and microhardness of austenitic steel

Modelling of active transformation of microstructure of two-phase Ti alloys during hot working

Superior Strength of Austenitic Steel Produced by Combined Processing, including Equal-Channel Angular Pressing and Rolling

Contact Info

Product

Resources

About