The role of twinning on microstructure and mechanical response of severely deformed single crystals of high-manganese austenitic steel

Астафурова, Е. Г.; Tukeeva, M. S.; Zakharova, G. G.; Melnikov, E.; Maier, Galina

doi:10.1016/j.matchar.2011.04.010

Cited by 36 publications

(17 citation statements)

References 13 publications

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“…In this operation, a sample in the shape of a thin disc is compressed between rigid anvils and subjected to torsional straining. Processing by HPT has been used with iron [5,6] and different steels [6][7][8][9][10][11][12][13][14][15][16], including twinning induced plasticity steels [17][18][19] which also exhibit very high uniform elongations at room temperature. A review of these data shows that different effects were reported during the processing of iron and steels by HPT.…”

Section: Introductionmentioning

confidence: 99%

Formation of epsilon martensite by high-pressure torsion in a TRIP steel

Figueiredo

Sicupira

Malheiros

et al. 2015

Materials Science and Engineering: A

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Section: Introductionmentioning

confidence: 99%

Formation of epsilon martensite by high-pressure torsion in a TRIP steel

Figueiredo

Sicupira

Malheiros

et al. 2015

Materials Science and Engineering: A

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“…When the cooling rate is 0. 25 alloying of the excessive phase with manganese, that is why the Fe/Mn ratio increases from 3.5 to 6.3, while the total content of manganese in the structure goes down from 6.7% to 2.1%. That is why it is quite natural that austenite contains more alloying elements.…”

Section: Discussionmentioning

confidence: 99%

“…At the same time, the magnitude of developing shrinkage stresses changes from +195 to 0 MPa. When the cooling rate is higher than 16 °С•s its deformation mechanism as well as the influence of various factors on this mechanism [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] . There are a number of papers concerned with the investigation of the microstructure and properties of Hadfield steel in the as-cast and the heat-treated states [37][38][39][40][41] .…”

mentioning

confidence: 99%

Mechanisms of cast structure and stressed state formation in Hadfield steel

2016

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H adfield steel is widely used to manufacture various parts for mining, machine-building, metallurgy, railway and other industries. Wide application of this steel can be explained by a unique set of performance characteristics including improved wear resistance under loads [1][2][3][4] . In spite of the fact that this steel has been used for quite a long time, in recent decades it has been attracting considerable interest of scientists in different countries [5] . Most investigations are aimed at improving its performance characteristics. This can be achieved by means of surface hardening [6][7][8][9] , alloying [10][11][12][13][14][15][16][17][18][19] and decreasing in the content of detrimental impurities [20,21] . Another way to improve the properties of this manganese steel is to investigate Abstract: The paper describes the investigation of mechanisms of cast structure formation in Hadfield steel depending on the changes in the cooling rate of a casting in the following two temperature ranges: crystallization temperature (1,200-1,390 °С) and the temperature of excessive phase separation (560-790 °С). Changes in the cooling rate of the crystallization temperature range from 1.1 to 25.0 °С•s -1 result in the reduction of the average size of austenite grains from 266 to 131 µm. At the same time, the magnitude of developing shrinkage stresses changes from +195 to 0 MPa. When the cooling rate is higher than 16 °С•s its deformation mechanism as well as the influence of various factors on this mechanism [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] . There are a number of papers concerned with the investigation of the microstructure and properties of Hadfield steel in the as-cast and the heat-treated states [37][38][39][40][41] . The literature review shows that the performance characteristics of steel are influenced by its parameters, such as its microstructure, chemical composition (including content of certain structural components) and the stressed state. However, these relationships cannot be used in the process of production of specific items as the research was carried out using model homogenized alloys, and the cooling rate in the process of structure forming was not taken into account. At the same time, the wide range of products from this steel includes castings weighing from one to several hundred kilograms. This influences cooling rates during and after crystallization. Further, it is reflected in the changes of qualitative and quantitative characteristics of their cast structure. The cast structure, in its turn, is essential, and its relationships are inherited even after heat treatment. V ol.13 No.6 November 2016O v e r s e a s F o u n d r y CHINA FOUNDRY In order to predict the performance characteristics of castings on the basis of the earlier research works, it is necessary to carry out a number of further investigations. In particular, it is necessary to study the influence of the cooling rate on the structure of the as-cast Hadfield steel. This relationship will provide the depen...

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“…Так, в работах [5,6] с использованием монокри-сталлов высокомарганцевых сталей Fe-13Mn-1.3C, Fe-13Mn-2,7Al-1,3C и Fe-28Mn-2,7Al-1,3C, деформиро-ванных методом КВД, было установлено, что механи-ческое двойникование, являющееся высокотемпера-турным механизмом деформации, вызывает сильные эффекты упрочнения и развивается даже в сталях с вы-сокой энергией дефекта упаковки, в которых оно обычно не наблюдается при деформации одноосным растяжени-ем или сжатием.…”

Section: Introductionunclassified

Effect of deformation temperature on the structural parameters, phase composition and microhardness of Fe-28Mn-2.7Al-1.3C steel single crystals processed by high-pressure torsion

Melnikov¹,

Астафурова²,

Maier³

2018

LoM

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Institute of Strength Physics and Materials Science SB RAS, 2 / 4 pr. Akademicheskii, Tomsk, 634055, Russia Using X-ray diffraction method, the effect of cold (23°C) and warm (200, 400°C) high-pressure torsion (HPT,6 GPa, N = 1, 3, 5 full revolutions) on the structural parameters and phase composition of single crystals of high-manganese austenitic steel Fe-28Mn-2.7Al-1.3С (wt. %) was investigated. HPT leads to the formation of a misoriented austenitic structure with predominant orientation of {111}-planes in the plane of the anvils. Increase in strain (the number of revolutions) contributes to a decrease in sizes of the coherent scattering regions and microstrain of the crystal lattice and causes an increase in the concentration of stacking faults calculated on the basis of the strain-induced shifting of X-ray lines. Regardless of the deformation temperature and the number of revolutions under HPT, steel retains an austenitic structure with lattice parameter of 3.638 -3.653 Å. An increase in deformation temperature contributes to a decrease in the austenite crystal lattice parameter that indicates on a partial decarburization of austenite, but only austenite lines are observed on X-ray diffraction patterns. As a result of deformation, the microhardness of the steel increases, and its magnitude significantly depends on the HPT temperature. In the case of cold deformation by HPT, the distribution of microhardness along the diameter of the disk is quasi-homogeneous and varies slightly with increasing number of revolutions. An increase in the deformation temperature is accompanied by the appearance of inhomogeneity in the distribution of the microhardness along the diameter of the diskthe values at the center are lower than that at the periphery. Методом рентгеновской дифракции изучали влияние холодного (при Т = 23°С) и теплого (при Т = 200 и 400°C) круче-ния под высоким давлением (6 ГПа, N = 1, 3 и 5 полных оборотов) на параметры структуры и фазовый состав моно-кристаллов высокомарганцевой аустенитной стали Fe-28Mn-2,7Al-1,3С (вес. %). Кручение под давлением приводит к формированию разориентированной аустенитной структуры с преимущественной ориентацией плоскостей {111} в плоскости наковален. Увеличение степени деформации (числа оборотов при кручении под давлением) способству-ет уменьшению размеров областей когерентного рассеяния и микродеформации кристаллической решетки и вы-зывает рост концентрации дефектов упаковки, рассчитанной на основе данных о смещении рентгеновских линий при деформации. Независимо от температуры и числа оборотов, при кручении под давлением сталь сохраняет аус-тенитную структуру с параметром решетки 3.638 -3.653 Å. Увеличение температуры деформации способствует сни-жению параметра кристаллической решетки аустенита, что свидетельствует о частичном обезуглероживании аусте-

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The role of twinning on microstructure and mechanical response of severely deformed single crystals of high-manganese austenitic steel

Cited by 36 publications

References 13 publications

Formation of epsilon martensite by high-pressure torsion in a TRIP steel

Formation of epsilon martensite by high-pressure torsion in a TRIP steel

Mechanisms of cast structure and stressed state formation in Hadfield steel

Effect of deformation temperature on the structural parameters, phase composition and microhardness of Fe-28Mn-2.7Al-1.3C steel single crystals processed by high-pressure torsion

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