Physical Simulation of Hot Rolling of Ultra-fine Grained Pure Titanium

Polyakov, A.; Гундеров, Д. В.; Ситдиков, В. Д.; Valiev, Ruslan Z.; Semenova, Irina P.; Sabirov, I.

doi:10.1007/s11663-014-0133-9

Cited by 6 publications

(7 citation statements)

References 46 publications

(1 reference statement)

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“…Примером немонотонного нагружения является всесторонняя ковка, при реализации которой смена схемы главных напряжений реализуется в результате поворота заготовки последовательно относительно трех осей [9,10]. Исследования, проведенные на титановых [11], медных [12] и алюминиевых [13,14] сплавах, показали, что сочетание РКУП с волочением или прокаткой приводит к дополнительному увеличению микротвердости и прочности УМЗ материалов. Аналогичный результат был получен для аустенитной стали: при проведении дополнительной прокатки на 77 % образцов после РКУП микротвердость и прочность стали увеличились на 35 % за счет формирования более мелкозернистой микроструктуры и увеличения плотности дислокаций [15].…”

Section: Introductionunclassified

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

Karavaeva¹,

Abramova²,

Enikeev³

et al. 2017

LoM

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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.

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Section: Introductionunclassified

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

Karavaeva¹,

Abramova²,

Enikeev³

et al. 2017

LoM

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“…This procedure has already been tested successfully for Ti-based [15], Cu-based [16] and Al-based alloys [17,18]. At the first stage of processing, SPD by ECAP-Conform was conducted, and at the second stage, rolling or drawing was performed.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, in [17], in the Al alloy 5083 after ECAP processing and additional compression, imitating rolling conditions, an increase in dislocation density was observed. An enhancement of strength after ECAP-Conform processing and compression of Ti [15], after ECAP processing and rolling of Cu [16], was accounted for by the formation of additional low-angle boundaries within grains and a transformation of the low-angle boundaries into high-angle ones. This conclusion is also consistent with the studies on the microstructure of austenitic steel in different states reported in the present study (see Table 3).…”

mentioning

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

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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.

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“…It is possible to realize the non-monotonic loading process through a consecutive processing of billets by different methods. This path has already been tested successfully for Ti-based [15], Cu-based [16] and Al-based alloys [17,18]. At the first stage of processing, SPD processing (ECAP-Conform) was conducted, and at the second stage, rolling (drawing) was performed.…”

Section: Introductionmentioning

confidence: 99%

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

Mv¹,

Mm²,

Na³

et al. 2016

Preprint

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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 the ultrafine-grained (UFG) structure formation, especially efficient with the use of severe plastic deformation (SPD) processing that enables increasing significantly the contribution of grain-boundary strengthening, and also involves a combination of 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 an additional strengthening of UFG steel. Analysis of the results of the study on the change of the microstructure and mechanical properties of the Cr-Ni stainless austenitic steel after a combined deformation reveals a substantial increase 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 С, yielding a strength more than 1.5 times higher that that produced by any of these two methods used separately.

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Physical Simulation of Hot Rolling of Ultra-fine Grained Pure Titanium

Cited by 6 publications

References 46 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

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

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

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