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

Karavaeva, M. V.; Abramova, Marina M.; Enikeev, Nariman A.; Рааб, Г. И.; Valiev, Ruslan Z.

doi:10.3390/met6120310

Cited by 22 publications

(15 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Regarding ASSs, due to the absence of a notable phase transformation during the thermal treatment, grain refinement has been achieved by static recrystallization (SRX), dynamic recrystallization (DRX), formation and reversion of strain‐induced martensite, and various severe plastic deformation techniques . In fact, many commercial ASSs are metastable against the martensitic transformation during deformation.…”

Section: Introductionmentioning

confidence: 99%

Effects of Grain Size on Mechanical Properties and Work‐Hardening Behavior of AISI 304 Austenitic Stainless Steel

Naghizadeh

Mirzadeh

2019

steel research int.

126

View full text Add to dashboard Cite

Grain size effects on the properties of AISI 304 austenitic stainless steel are studied. Yield stress (YS) and ultimate tensile strength (UTS) increased with decreasing grain size (Hall–Petch law) while the difference between YS and UTS decreased. Three distinct stages for work‐hardening rate are identified: I) initial rapid fall until reaching a minimum value, II) subsequent rise to a maximum due to the transformation‐induced plasticity (TRIP) effect, which is found to enhance by increasing grain size, and III) final fall until the onset of necking. More in‐depth analysis on the mechanical stability of austenite reveals that for below‐average grain size of ≈50 μm, by decreasing grain size, the TRIP effect diminishes; whereas for grain size larger than ≈50 μm, by increasing grain size, the TRIP effect becomes less pronounced. Due to the strong TRIP effect, high incremental work‐hardening exponents (n‐values of higher than 0.8) and low‐yield ratios (smaller than 0.5) are observed. It is also found that when the average grain size increases, the tensile toughness and the size and depth of dimples increase. The latter is responsible for the tardiness of the microcavity coalescence, which is indicative of high ductility of this austenitic alloy.

show abstract

Section: Introductionmentioning

confidence: 99%

Effects of Grain Size on Mechanical Properties and Work‐Hardening Behavior of AISI 304 Austenitic Stainless Steel

Naghizadeh

Mirzadeh

2019

steel research int.

126

View full text Add to dashboard Cite

show abstract

“…Интенсивную пластическую деформацию прутков диаметром 10 мм длиной 100 мм осуществили методом равноканального углового прессования (РКУП) за 8 проходов при температуре 400°С, угол пересечения каналов составил 120°, маршрут Вс [15]. Это состояние далее обозначено как «РКУП».…”

Section: материал и методика экспериментаunclassified

“…Электронограмма (вставка рис. 1b) представлена отдельными рефлексами, расположенными по окружности [15].…”

Section: результаты исследования и обсуждениеunclassified

“…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]. Для аустенитной стали повышение прочности термической обработкой практически невозможно, поэтому дополнительное упрочнение в результате холодной пластической деформации является актуальной задачей.…”

Section: Introductionunclassified

See 1 more Smart Citation

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

“…Even the individual areas are extensively represented. In manufacturing, there are articles on the effects of welding [1-4], electroslag remelting [5,6], and rolling [7][8][9]. As is typical in any discussion of steels, many papers focus on microstructure-property relations [10][11][12][13][14].…”

mentioning

confidence: 99%

Alloy Steels

Tuttle

2018

Metals

View full text Add to dashboard Cite

Since their invention in 1865, alloy steels have found broad application in multiple industries; the automotive, aerospace, heavy equipment, and pipeline industries to name a few. Alloy steels include a tremendous variation in alloying content. They range from the 1-2 wt. % Cr or Ni in some low alloy steels to the 15-18 wt. % Cr content of many stainless steels. The topic of alloy steels contains both the common 4140 and 316 alloys to more exotic alloys such as the Hadfield steels. These steels can form a wide variety of microstructures such as pearlite, bainite, or martensite, which result in an equally broad range of properties. It is this range that has made them useful to so many industries. In some cases, these are the only steel alloys that can provide the required combination of properties. Their use in the automotive industry has been key to the development of safer vehicles and improved fuel efficiency. Our modern world would not be possible without the advanced alloy steels employed to safely transport oil through pipelines. Therefore, continued development is necessary to expand markets, improve products, and enhance the human condition. It is this importance that has lead us at Metals to create the special issue on alloy steels that you are reading. What follows are 23 papers from a wide range of authors and nationalities which represents the current state of the art in alloy steel research.This issue, like alloy steels themselves, covers diverse set of articles. There are articles on manufacturing, microstructure, heat treatment, corrosion, and service conditions. This expansive range reflects the multifaceted nature of alloy steels. Even the individual areas are extensively represented. In manufacturing, there are articles on the effects of welding [1-4], electroslag remelting [5,6], and rolling [7][8][9]. As is typical in any discussion of steels, many papers focus on microstructure-property relations [10][11][12][13][14]. These form the basis for improving the alloys and their processing. Another large section of work focuses on topics of more interest to those who are the final customers of the steel industry. Many alloy steels are heat treated and understanding the effects of heat treatment and heat treating parameter selection ensure the correct microstructure and properties are attained. Readers will find these topics addressed by several authors in our pages [10,[15][16][17][18]. Those readers interested in improving the corrosion resistance of alloy steels will find several pieces on this topic [2,19,20]. An aspect often ignored by many journals is performance under actual service conditions in the final product, there are two articles on wear resistance and pipeline life that remind us of the importance of understanding the final product [21][22][23]. Data from the final products created from these steels always provide a powerful insight which the best labs can never replicate, and their inclusion in this special issue is a significant contribution to this special issue.Of particular inte...

show abstract

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

Cited by 22 publications

References 29 publications

Effects of Grain Size on Mechanical Properties and Work‐Hardening Behavior of AISI 304 Austenitic Stainless Steel

Effects of Grain Size on Mechanical Properties and Work‐Hardening Behavior of AISI 304 Austenitic Stainless Steel

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

Alloy Steels

Contact Info

Product

Resources

About