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Gotowa bibliografia na temat „Mn TWIP Steel”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Mn TWIP Steel"

Razavi, Gholam Reza. "The Study of Type Twin Annealing in High Mn Steel". Applied Mechanics and Materials 148-149 (grudzień 2011): 1085–88. http://dx.doi.org/10.4028/www.scientific.net/amm.148-149.1085.

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TWIP steels are high manganese steel (Mn: 17% - 35%) which are used for shaping car bodies. The structure of this kind of steels remains austenite even in room temperature. Due to low SFE (Stacking Fault Energy) twinning of grains is governing reformation mechanism in this kind of steels which strengthen TWIP steel. Regarding heat treatment influences on mechanical properties of TWIP steels, in this paper we discuss twinning phenomenon resulting from this kind of treatment. For this, following casting and hot rolling processes, we anneal the steel at 1100°C and different time cycles and study its microstructure using light microscope. The results showed that with decreasing grain size the number of twin annealing added And four types of annealing twin in the microstructure, in the end they all become one twin and then turn into grain.

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UEJI, Rintaro. "Alloyed Steel(TWIP Steel, High Mn Steel)". Journal of the Japan Society for Technology of Plasticity 53, nr 620 (2012): 814–17. http://dx.doi.org/10.9773/sosei.53.814.

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Wang, Li Hui, Di Tang, Hai Tao Jiang, Ji Bin Liu i Yu Chen. "Effects of Different Manganese Content on Microstructures and Properties of TWIP Steel". Advanced Materials Research 399-401 (listopad 2011): 254–58. http://dx.doi.org/10.4028/www.scientific.net/amr.399-401.254.

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By analysis of TWIP Steels with different manganese content, the results showed that the microstructures and properties had been changed with different Mn content. The elongation of the tested steel with 22.5% Mn was high for 55.5 % and n value of that reached to 0.360. When Mn content of the tested steel was 17.9%, the yield and tensile strength were higher and its elongation was lower for the tested steel than that of the tested steel with 22.5% Mn. The microstructures of the tested steel with high Mn content were austenite before and after being stretched at room temperature. Mn content was decreased and the microstructure of the tested steel after being stretched had a small amount of martensite transformation at room temperature. That is to say, double effect with TWIP and TRIP had occurred, but TWIP effect was dominant. TWIP effect increased plasticity and strain hardening capacity to improve formability. TRIP effect was mainly to improve strength so as to further attain the strength of the tested steel.

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Bastidas, David M., Jacob Ress, Juan Bosch i Ulises Martin. "Corrosion Mechanisms of High-Mn Twinning-Induced Plasticity (TWIP) Steels: A Critical Review". Metals 11, nr 2 (7.02.2021): 287. http://dx.doi.org/10.3390/met11020287.

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Twinning-induced plasticity (TWIP) steels have higher strength and ductility than conventional steels. Deformation mechanisms producing twins that prevent gliding and stacking of dislocations cause a higher ductility than that of steel grades with the same strength. TWIP steels are considered to be within the new generation of advanced high-strength steels (AHSS). However, some aspects, such as the corrosion resistance and performance in service of TWIP steel materials, need more research. Application of TWIP steels in the automotive industry requires a proper investigation of corrosion behavior and corrosion mechanisms, which would indicate the optimum degree of protection and the possible decrease in costs. In general, Fe−Mn-based TWIP steel alloys can passivate in oxidizing acid, neutral, and basic solutions, however they cannot passivate in reducing acid or active chloride solutions. TWIP steels have become as a potential material of interest for automotive applications due to their effectiveness, impact resistance, and negligible harm to the environment. The mechanical and corrosion performance of TWIP steels is subjected to the manufacturing and processing steps, like forging and casting, elemental composition, and thermo-mechanical treatment. Corrosion of TWIP steels caused by both intrinsic and extrinsic factors has posed a serious problem for their use. Passivity breakdown caused by pitting, and galvanic corrosion due to phase segregation are widely described and their critical mechanisms examined. Numerous studies have been performed to study corrosion behavior and passivation of TWIP steel. Despite the large number of articles on corrosion, few comprehensive reports have been published on this topic. The current trend for development of corrosion resistance TWIP steel is thoroughly studied and represented, showing the key mechanisms and factors influencing corrosion processes, and its consequences on TWIP steel. In addition, suggestions for future works and gaps in the literature are considered.

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Moon, K. M., D. A. Kim, Y. H. Kim i M. H. Lee. "Effect of Mn content on corrosion characteristics of lean Mn TWIP steel". International Journal of Modern Physics B 32, nr 19 (18.07.2018): 1840083. http://dx.doi.org/10.1142/s0217979218400830.

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It is important that the steel plate is manufactured with a high tensile strength to reduce the weight of the body. It is generally accepted that twinning induced plasticity (TWIP) steel is a special steel with not only a high ductility but also a high-tensile strength compared to general steel. While numerous investigations have been carried out on the TWIP steel with an amount of manganese of at least 20%, the investigation of steel with manganese content of less than 20% has seldom been considered until now. In this study, the TWIP steel with manganese of less than 20% (12Mn, 15Mn and 18Mn TWIP steel) was investigated to determine the corrosion properties using electrochemical method. The 18Mn and 12Mn samples exhibited the best and worst corrosion resistance, respectively. It is suggested that the 18Mn sample forms a stable oxide film on the surface because it contains a larger amount of manganese and aluminum compared to the other samples, and their composition enables the easy formation of the oxide film.

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Martin, Ulises, Jacob Ress, Juan Bosch i David M. Bastidas. "Effect of Thermo-Mechanical Processing on the Corrosion Behavior of Fe−30Mn−5Al−0.5C TWIP Steel". Applied Sciences 10, nr 24 (19.12.2020): 9104. http://dx.doi.org/10.3390/app10249104.

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Electrochemical corrosion of thermo-mechanically processed (TMP) and recrystallized Fe−30Mn−5Al−0.5C twinning-induced plasticity (TWIP) steels containing 30 wt.% Mn was studied in a 1.0 wt.% NaCl electrolyte solution. The alkaline nature of the corrosion products containing manganese oxide (MnO) increases the dissolution kinetics of the TWIP steel in acid media, obtaining Mn2+ cations in solution, and producing the hydrogen evolution reaction (HER). X-ray photoelectron spectroscopy (XPS) surface analysis revealed an increased Al2O3 content of 91% in the passive layer of the recrystallized TWIP steel specimen, while in contrast only a 43% Al2O3 was found on the TMP specimen. Additionally, the chemical composition of the surface oxide layer as well as the TWIP alloy microstructure was analyzed by optical microscopy (OM) and scanning electron microscopy (SEM). The results indicate an enhanced corrosion attack for the TMP high-Mn TWIP steel.

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Yang, Yang, Chun Fu Li i Kai Hong Song. "Effect of Strain Rate on the Microstructures and Properties of Hot–Rolled TWIP Steel in the Solution Condition". Advanced Materials Research 430-432 (styczeń 2012): 256–59. http://dx.doi.org/10.4028/www.scientific.net/amr.430-432.256.

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TWIP steel containing 0.21% C, 24.4% Mn, 0.9% Si, 1.84% Al, 4.61% Cr, 1.89% Ni, 0.41% Mo and 0.012% Nb was investigated. Tensile tests of this steel were performed in the strain rate range of 10−4–10−3 s−1. Results indicate that tensile properties of TWIP steel at room temperature are sensitive to strain rate in the studied range. Analyses on the relationship between strain–hardening exponent and strain rates show that the formation of twins during deformation greatly affects the strain–hardening behavior of TWIP steels.

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Olugbade, Temitope Olumide. "Stress corrosion cracking and precipitation strengthening mechanism in TWIP steels: progress and prospects". Corrosion Reviews 38, nr 6 (18.11.2020): 473–88. http://dx.doi.org/10.1515/corrrev-2020-0052.

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AbstractTwinning-induced plasticity (TWIP) steels are increasingly receiving wide attention for automotive applications due to their outstanding combination of ductility and strength, which can largely be attributed to the strain hardening effect, formation of mechanical twins during straining, and the presence of manganese (Mn) as an alloying element. However, the premature cracking and sudden failure frequently experienced by the TWIP steels under the combined action of tensile stress and corrosion environment remain a challenge for many material scientists and experts up till now. Driven by this challenge, an overview of the stress corrosion cracking (SCC) susceptibility of high-Mn TWIP steels (under the action of both mechanical loading and corrosion reaction) is presented. The SCC susceptibility of the high-Mn TWIP steels is specifically sensitive to hydrogen embrittlement, which is a major factor influencing the SCC behavior, and is a function of the hydrogen content, lattice-defect density and strength level. Besides, the corrosion susceptibility to hydrogen embrittlement may be reduced by suppressing the martensite in the TWIP steels by carbon additions. This review further discusses in detail the precipitation strengthening mechanisms as well as the corrosion behavior of TWIP steel by mechanism.

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Hernández-Belmontes, Humberto, Ignacio Mejía i Cuauhtémoc Maldonado. "Ab Initio Study of Weldability of a High-Manganese Austenitic Twinning-Induced Plasticity (TWIP) Steel Microalloyed with Boron". MRS Proceedings 1812 (2016): 35–40. http://dx.doi.org/10.1557/opl.2016.15.

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ABSTRACTHigh-Mn Twinning-Induced Plasticity (TWIP) steels are advanced high-strength steels (AHSS) currently under development; they are fully austenitic and characterized by twinning as the predominant strengthening mechanism. TWIP steels have high strength and formability with an elongation up to 80%, which allows reduction in automotive components weight and fuel consumption. Since the targeted application field of TWIP steels is the automotive industry, steels need high mechanical performance with good weldability and excellent corrosion resistance. However, there is lack of information about the weldability behavior of these advanced steels. This research work aims to study the weldability of a new generation of high-Mn austenitic TWIP steels microalloyed with B. Weldability was examined using spot welds produced by Gas Tungsten Arc Welding. Microstructural changes were examined using light optical metallography. Segregation of elements in the weld joint was evaluated using point and elemental mapping chemical analysis by Scanning Electron Microscopy and Electron-Dispersive Spectroscopy; while the hardness properties were examined with Vickers microhardness testing (HV25). Experimental results show that the welded joint microstructure consists of austenitic dendritic grains in the fusion zone, and equiaxed grains in the heat affected zone. Notably, the boron microalloyed TWIP steel exhibited poor weldability, showing hot cracking. Additionally, the studied TWIP steels showed a high degree of segregation in the fusion zone; Mn and Si segregated into the interdendritic regions, while Al and C preferentially segregated in dendritic areas. Finally, the welded joints of the TWIP steels showed microhardness values lower than the base material. In general, the present TWIP steels have problems of weldability, which are corroborated with microstructural changes, elements segregation and microhardness loss.

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Peng, Ru Lin, Xiao Peng Liu, Yan Dong Wang, Shu Yan Zhang, Yong Feng Shen i Sten Johansson. "In-Situ Neutron Diffraction Study of the Deformation Behaviour of Two High-Manganese Austenitic Steels". Materials Science Forum 681 (marzec 2011): 474–79. http://dx.doi.org/10.4028/www.scientific.net/msf.681.474.

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In-situ neutron diffraction experiments under tensile loading were carried out to study the micromechanical behaviour of two iron-manganese based steels, a TWIP (twinning induced plasticity) steel with 30 wt% Mn and a TRIP steel (transformation induced plasticity) with 20 wt% Mn. The former was loaded to 31.3% strain and the latter to 20% strain. The 30 wt.% Mn steel had a fully austenitic microstructure which remained stable over the loading range studied, while stress induced austenite to α´- and ε-martensite transformations occur in the 20 wt.% Mn steel which initially contained an α´-martensite in addition to the austenite. The evolution of lattice strains under tensile loading differs between the two steels, reflected their different plastic deformation mechanisms. A stronger grain-orientation dependent behaviour is observed during deformation for the 20 wt.% Mn in contrast to the 30wt.% Mn steel.

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Rozprawy doktorskie na temat "Mn TWIP Steel"

Hamada, A. S. (Atef Saad). "Manufacturing, mechanical properties and corrosion behaviour of high-Mn TWIP steels". Doctoral thesis, University of Oulu, 2007. http://urn.fi/urn:isbn:9789514285844.

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Abstract Austenitic high-Mn (15–30 wt.%) based twinning-induced plasticity (TWIP) steels provide great potential in applications for structural components in the automotive industry, owing to their excellent tensile strength-ductility property combination. In certain cases, these steels might also substitute austenitic Cr-Ni stainless steels. The aim of this present work is to investigate the high-temperature flow resistance, recrystallisation and the evolution of microstructure of high-Mn steels by compression testing on a Gleeble simulator. The influence of Al alloying (0–8 wt.%) in the hot rolling temperature range (800°C–1100°C) is studied in particular, but also some observations are made regarding the influence of Cr alloying. Microstructures are examined in optical and electron microscopes. The results are compared with corresponding properties of carbon and austenitic stainless steels. In addition, the mechanical properties are studied briefly, using tension tests over the temperature range from -80°C to 200°C. Finally, a preliminary study is conducted on the corrosion behaviour of TWIP steels in two media, using the potentiodynamic polarization technique. The results show that the flow stress level of high-Mn TWIP steels is considerably higher than that of low-carbon steels and depends on the Al concentration up to 6 wt.%, while the structure is fully austenitic at hot rolling temperatures. At higher Al contents, the flow stress level is reduced, due to the presence of ferrite. The static recrystallisation kinetics is slower compared to that of carbon steels, but it is faster than is typical of Nb-microalloyed or austenitic stainless steels. The high Mn content is one reason for high flow stress as well as for slow softening. Al plays a minor role only; but in the case of austenitic-ferritic structure, the softening of the ferrite phase occurs very rapidly, contributing to overall faster softening. The high Mn content also retards considerably the onset of dynamic recrystallisation, but the influence of Al is minor. Similarly, the contribution of Cr to the hot deformation resistance and static and dynamic recrystallisation, is insignificant. The grain size effectively becomes refined by the dynamic and static recrystallisation processes. The tensile testing of TWIP steels revealed that the Al alloying and temperature have drastic effects on the yield strength, tensile strength and elongation. The higher Al raises the yield strength because of the solid solution strengthening. However, Al tends to increase the stacking fault energy that affects strongly the deformation mechanism. In small concentrations, Al suppresses martensite formation and enhances deformation twinning, leading to high tensile strength and good ductility. However, with an increasing temperature, SFE increases, and consequently, the density of deformation twins decreases and mechanical properties are impaired. Corrosion testing indicated that Al alloying improves the corrosion resistance of high-Mn TWIP steels. The addition of Cr is a further benefit for the passivation of these steels. The passive film that formed on 8wt.% Al-6wt.%Cr steel was found to be even more stable than that on Type 304 steel in 5–50% HNO3 solutions. A prolonged pre-treatment of the steel in the anodic passive regime created a thick, protective and stable passive film that enhanced the corrosion resistance also in 3.5% NaCl solution.

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Kalsar, Rajib. "Evolution of Microstructure and Texture in Manganese Steels". Thesis, 2017. http://etd.iisc.ac.in/handle/2005/4244.

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Twinning Induced Plasticity (TWIP) and Transformation Induced Plasticity (TRIP) steels possess excellent combination of high strength and high ductility. Deformation twinning and strain induced martensitic phase transformation are the dominant deformation mechanisms in TWIP and TRIP steels, respectively. The TWIP and TRIP effects are strongly dependent on stacking fault energy (SFE), which essentially decides the operating deformation mechanisms. In TWIP steels, which are characterized by SFE in the range 18 - 45 mJ/m2, deformation takes place primarily by twinning, whereas in TRIP steels where the SFE below 18 mJ/m2, deformation is by martensitic transformation. TWIP steels contain very high amount of manganese (Mn) for the stabilization of austenitic phase and to keep the SFE within the prescribed range. In TRIP steels, the Mn content is rather low. The present thesis primarily deals with the evolution of the microstructure, texture and mechanical properties in TWIP/TRIP steels for a range of Mn content. Chapter 1 of the thesis presents the general introduction of the TWIP/TRIP steels and an extended review of published literature on these materials. The experimental procedures and the methodology of data analysis are presented in chapter 2. Chapter 3 deals with the effect of deformation on the evolution of microstructure and texture in a high Mn steel. The evolution of microstructure and texture has been examined for deformation up to very large strains. In chapter 4, two medium Mn steels with 18 and 12 wt. pct. Mn have been studied about evolution of microstructure and texture, hence the associated the deformation mechanisms have been explored. For both the materials deformation texture has been characterized by the evolution of Bs-type texture. Deformation twinning has been identified as main mechanisms in the early stages of deformation and shear banding at intermediate to large deformation. Thermal stability of the deformed microstructure has been examined and recrystallization mechanisms have been identified. Chapter 5 deals with the effect of Al addition on deformation mechanisms, texture evolution and mechanical properties in medium Mn TWIP steels. The effect of Al addition has been studied more comprehensively. It was found that different Al containing alloy led to different mechanical response in terms of yield strength and strain hardening, which has been attributed to different propensity of twinning. In chapter 6, the basic principles of alloy design, deformation mechanisms and mechanical properties have been investigated for low Mn steels (<10 wt. pct. Mn), exhibiting TWIP/TRIP effects. It has been found that in these materials, microstructural development takes place on elemental partitioning during inter-critical annealing. The phase fraction of austenite in the microstructure depends on the inter-critical annealing temperature, annealing time, chemical composition and rolling conditions before annealing. An elaborate study on possible alloying additions and their consequences have also been discussed. Overall conclusions pertaining to the investigations carried out in the entire thesis have been summarized in chapter 7 along with the suggestions for the future work.

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Huang, Yu-chang, i 黃玉璋. "Effect of Mn、Al on mechanical properties in TWIP steels after cold rolling". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/97387087075257754786.

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碩士
國立高雄大學
化學工程及材料工程學系碩士班
99
This study focused on the effect of Mn and Al alloys on the mechanical properties in cold-rolled TWIP steels, however, the effect of strain rate on mechanical properties was also investigated. In this study, steels were adopted as the test materials. According to thermodynamic calculation, the stacking fault energy of the 21Mn、24Mn and 24Mn-4Al were 21.9 mJ/m2, 29.2 mJ/m2 and 58.7 mJ/m2, respectively. It reveals that stacking fault energy increased with addition of manganese and aluminum. As the mechanical property, tensile test was carried out to investigate the TWIP steels tensile strength (T.S.), elongation (El.), and toughness (T.S.×El.) with various strain rates of 3.3×10-3s-1、3.3×10-2s-1、10-1s-1. The results showed that 21Mn possessed the maximum (T.S.) of 907.6MPa. and 24Mn possessed the maximum elongation (El.) of 78.9%. In addition, 24Mn-4Al possessed the maximum Y.S. of 352.9MPa. Summary the results of mechanical properties showed that 24Mn steel possessed the superior toughness of 69645.03MPa% (T.S.×El. value), while strain rate of 3.3×10-3s-1. 21Mn and 24Mn-4Al steels were 54819.04 MPa% and 43918.75 MPa%, respectively. From XRD results, 24Mn and 24Mn-4Al steels possessed stableγphase, even though after deformed. It was noticed the 21Mn specimen possessed γ(F.C.C.) structure before tensile test and obtained the phase transformation fromγ transform to εafter tensile test. The TEM results revealed ε-martensite and twin co-exist in 21Mn, it supported that deformation mechanism is TRIP and TWIP under tensile test. Only mechanical twin structure was observed in 24Mn, resulting in obtaining TWIP deformation mechanism. Moreover 24Mn-4Al possessed dislocation entanglement phenomenon and twin structure; as a result its deformation mechanism was classified to dislocation slip and partly TWIP mode. As the effect of strain rate on mechanical property with TWIP steels, the elongation (El.) of 21Mn was increased from 60.4% to 75.07% with strain rate increasing. In addition, the value of T.S.×El. was also increased to 68024.02 MPa%. However, 24Mn possessed the highest value of T.S.×El. reached to 69029 MPa%. But the strain rate was not affect the mechanical property of 24Mn-4Al significantly.

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Jhang, Kai-Bin, i 章凱斌. "Effect of Mn and Al-elements on the properties of TWIP steels after hot rolling". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/13702985416164122416.

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碩士
義守大學
材料科學與工程學系碩士班
98
The effects of Mn contents (19wt%、21wt%、24wt%) and Al contents (2wt%、4wt%) on the mechanical characteristics of twinning induced plasticity steels (TWIP steels) were investigated. Two major works on the TWIP steels with various Mn and Al contents were carried out in this study including: (1) the varied of stacking fault energy (SFE), high temperature ductility, and microstructure of TWIP steels with Al content; (2) the effect of hot rolling and cold rolling on microstructure and mechanical property of TWIP steels.The SFE of TWIP steels were calculated using thermodynamics. It is found that the SFE increases with inreasing Mn and Al contents. The SFE of TWIP steels studied are ranging from18 to 58 mJ/m2.Concerning the high temperature ductility, the reduction of area (RA) of all the steels decreased with decreasing deformation temperature. When the steels were deformed at 1100℃, the steel with 24wt% Mn content exhibited highest RA. The RA of TWIP steels with 24 wt% Mn content decreased with the addition of Al. The RA of the steel with 24wt%Mn-4wt%Al content was lower than 40% when it was deformed at 900℃, indicating a very poor hot workability.The mechanical performance of as-hot rolled TWIP steels are indicated by the product of tensile strength and total elongation (T.S.×El.). The steel with 21wt% Mn content exhibited best T.S.×El. product, whereas the steel with 24wt%Mn-4wt%Al content exhibited lowest product.Concerning the mechanical performance of TWIP steels subjected to SAT (SAT, 1000℃×20min.), both the steels with 21 and 24 wt% Mn contents exhibited the product over 70 000MPa%, whereas the steel with 24wt%Mn-4wt%Al content gain possessed lowest product. Supposed that the deformation mechanism is between twining induced plasticity and slip with the stacking fault energy of Al element about 60mJ/m2. Compare with C-Mn steels, TWIP steels possess the superior plasticity with Al content because of the slip mechanism.

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Części książek na temat "Mn TWIP Steel"

Dobrzański, Leszek A., Janusz Mazurkiewicz, Wojciech Borek i Małgorzata Czaja. "Newly-Developed High-Manganese Fe–Mn–(Al, Si) Austenitic TWIP and TRIP Steels". W Rolling of Advanced High Strength Steels, 224–88. Boca Raton, FL : CRC Press, [2017]: CRC Press, 2017. http://dx.doi.org/10.1201/9781315120577-6.

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Dobrzański, L. A., W. Borek i J. Mazurkiewicz. "TWIP Mechanism in High-Mn Austenitic Steels and Its Effect on Steels Properties". W Frontiers in Materials Processing, Applications, Research and Technology, 321–31. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-4819-7_27.

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Verbeken, Kim, Lieven Bracke, Leo Kestens i Jan Penning. "Microstructural and Textural Evolutions in a Cold Rolled High mn Twlp Steel". W Ceramic Transactions Series, 341–48. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470444191.ch38.

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Collet, J. L., Françoise Bley, Alexis Deschamps, H. de Monestrol, Jean François Berar i Colin Scott. "The Deformation Mechanisms of TWIP Steels (Fe-Mn-C) Viewed by X-Ray Diffraction". W Solid State Phenomena, 53–56. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/3-908451-40-x.53.

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Collet, J. L., Françoise Bley, Alexis Deschamps i Colin Scott. "Study of the Deformation Mechanisms of TWIP Steels (Fe-Mn-C) by X-Ray Diffraction". W THERMEC 2006 Supplement, 822–27. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-429-4.822.

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Hamada, A. S., L. Pentti Karjalainen, Mahesh C. Somani i R. M. Ramadan. "Deformation Mechanisms in High-Al Bearing High-Mn TWIP Steels in Hot Compression and in Tension at Low Temperatures". W Materials Science Forum, 217–22. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-434-0.217.

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De Cooman, B. C. "High Mn TWIP steel and medium Mn steel". W Automotive Steels, 317–85. Elsevier, 2017. http://dx.doi.org/10.1016/b978-0-08-100638-2.00011-0.

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De Cooman, B. C., Kwang-geun Chin i Jinkyung Kim. "High Mn TWIP Steels for Automotive Applications". W New Trends and Developments in Automotive System Engineering. InTech, 2011. http://dx.doi.org/10.5772/14086.

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Streszczenia konferencji na temat "Mn TWIP Steel"

Varga, M., L. Janka, M. Rodríguez Ripoll, L. M. Berger, S. Thiele, V. Matikainen, P. Vuoristo, L. Janka i H. Ben Hamouda. "High Temperature Sliding of TiC Based Hardmetal Coatings Against TWIP Steel". W ITSC2021, redaktorzy F. Azarmi, X. Chen, J. Cizek, C. Cojocaru, B. Jodoin, H. Koivuluoto, Y. C. Lau i in. ASM International, 2021. http://dx.doi.org/10.31399/asm.cp.itsc2021p0278.

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Abstract Manufacturing of steel components is often done at high temperatures (HT) posing a serious challenge to components such as forming tools. Thermal spray coatings provide a cost-effective solution for surface protection under HT, corrosive environments and severe wear conditions. Thermally sprayed coatings based on cubic hard materials such as TiC and TiCN can provide an alternative to widely used Cr3C2-NiCr. While the latter possess a superb oxidation resistance and wear resistance at HT, they are prone to degradation in the presence of Mn, an element commonly alloyed in many modern steel grades such as TWIP (twinning-induced plasticity steel). In this study, a (Ti,Mo)(C,N)-29% Ni hardmetal feedstock powder was prepared by agglomeration and sintering. Coatings were deposited using a high velocity air-fuel (HVAF) spray process. The coating was benchmarked against a standard Cr3C2-NiCr coating obtained with the same spray process. Our work comprises analyses of the feedstock powder along with the resulting coating microstructure after deposition and heat treatment. Further, the HT sliding behavior against TWIP steel using a HT pin-on-disc tribometer at 700°C was investigated. The results showed a clear benefit of the TiCN-based coating, with almost no wear detected, while the Cr3C2-coating showed a significant wear loss. Based on these results, the TiCN-based coating is regarded as potential solution for prospective forming applications of modern high Mn steels, such as TWIP.

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Dolzhenko, P., M. Tikhonova, A. Belyakov i R. Kaibyshev. "Dynamic recrystallization of a high-Mn TWIP steel during multiple forging at 800°C". W PROCEEDINGS OF THE ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES. Author(s), 2018. http://dx.doi.org/10.1063/1.5083309.

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Kusakin, Pavel, Andrey Belyakov i Rustam Kaibyshev. "Analysis of the tensile behavior of high-Mn TWIP steel based on the microstructural evolution". W ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2016: Proceedings of the International Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2016. Author(s), 2016. http://dx.doi.org/10.1063/1.4966418.

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da Silva Lima, M. N. "Microstructural and corrosion study of a “non-comercial” high manganese steel". W Superplasticity in Advanced Materials. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902615-37.

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Abstract. High-Mn steels have great plasticity when subjected to deformation due to TWIP or TRIP effects. This work evaluated the microstructural evolution, the formation of the -Martensite phase taking into account the hot rolling of 80-60% and the solution annealing. Afterwards, microstructures were analyzed by SEM. Volume fraction of the Austenite and -Martensite phases were measured by EBSD technique. The steel obtained low energy levels of stacking fault, favoring the effect TRIP. Corrosion resistance in 0.1M NaCl solution was analyzed by open potential circuit and potentiodynamic polarization techniques. The analysis of the curves and the surface of the steel after the polarization tests showed that the steel with less strain had relatively nobler potential than the steel with more strain.

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Tikhonova, M., P. Dolzhenko, A. Belyakov i R. Kaibyshev. "Effect of hot working conditions on microstructure and mechanical properties of a high-Mn TWIP steel". W PROCEEDINGS OF THE ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES. Author(s), 2018. http://dx.doi.org/10.1063/1.5083547.

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Darcis, Philippe P., Israel Marines-Garcia, Stephen J. Hudak, Mariano Armengol i Hector M. Quintanilla. "Sour Environmentally Assisted Fatigue of Welded SCR Materials: Post-Weld Finishing Treatment Evaluation". W ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-21026.

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The current work aims to point out the influence of sour brine environment on the fatigue resistance of welded SMLS (seamless) steel pipe used for design and fabrication of risers for oil and gas development. A C-Mn steel X65 pipe 10.75″ (273.1 mm) outside diameter (OD) and 25.4 mm wall thickness (WT) was chosen for this program. The Welding Procedure designed for girth welds manufacturing involved the use of Lincoln STT-GMAW™ process for the root pass and SAW process with twin wire configuration for the fill and cap passes. This welding procedure presents a special post-weld finishing treatment, which consist in flapping the inner and outer weld overfills to produce a flush profile between weld metal and outer/inner pipe surfaces. The experimental approach focused on quantifying the effect of H2S using a sour brine environment. For this purpose, intermediate-scale fatigue data in the sour brine environment, using full thickness’ strip specimens extracted from the welded SMLS (seamless) pipe, have been generated. Intermediate-scale fatigue tests in air have also been obtained to provide a baseline for comparison with the sour brine data. Those results have been compared with full-scale fatigue tests in air environment. Finally, results were statistically analyzed to determine which standard fatigue design curves best represent the measured S-N fatigue endurance in air and sour brine environments. Results were also compared with available literature and results on other seamless’ welded pipe of the same API 5L, Grade X65 steel in comparable environments.

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Khan, Rashid, Tasneem Pervez i Omar S. Al-Abri. "Modeling and Simulations of Transformation and Twinning Induced Plasticity in Advanced High Strength Austenitic Steels". W ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-51953.

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The current research work is focused on the development of a combined micromechanical model of transformation and twinning induced plasticity mechanisms in austenite based high Mn steels. Both mechanisms are combined by incorporating transformation in twinning based crystal plasticity model. Initially, mechanical twinning is incorporated in slip based crystal plasticity model. Afterwards, transformation phenomenon (austenite to martensite) is included in the developed slip and twin based crystal plasticity model. The kinematics of the mechanisms is developed by defining elastic, plastic, and transformation deformation gradients. These deformation gradients are then used to calculate stress tensors. The constitutive equations in terms of integration algorithm are implemented in ABAQUS as a user-defined subroutine. Three dimensional finite element model of single and polycrystal austenite are developed. Single austenite crystal is represented by one finite element while the behavior of polycrystal austenite is estimated through 500 grains. The orientation of each grain is defined through Euler angles. The performance of the model is evaluated through finite element simulations in order to predict the elastic-plastic and transformation behaviors of single and polycrystal austenite under different loading conditions i.e. uniaxial tension and simple shear. The developed model is in good agreement with published literature. In simple shear, prominent difference in stress magnitude is found once twinning mode is incorporated in slip and transformation. This difference has significant magnitude in case of polycrystal austenite. This shows substantial advantage (in terms of strength and formability) of incorporating mechanical twinning along with slip and transformation.

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Darcis, Philippe P., Israel Marines-Garcia, Eduardo A. Ruiz, Elsa C. Marques, Mariano Armengol i Hector M. Quintanilla. "Full Scale Fatigue Performance of Pre-Strained SCR Girth Welds: Comparison of Different Reeling Frames". W ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-21025.

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The current work aims to point out the influence of plastic strain history, due to reel-lay installation, on the fatigue resistance of welded SMLS (seamless) steel pipes used for fabrication of Steel Catenary Risers (SCRs) for oil and gas development. A C-Mn steel X65 pipe 10.75″ (273.1 mm) outside diameter (OD) and 25.4 mm wall thickness (WT) was chosen for this program. The Welding Procedure designed for girth welds manufacturing involved the use of Lincoln STT-GMAW™ (Surface Tension Transfer–Gas Metal Arc Welding) process for the root pass and SAW (Submerged Arc Welding) process with twin wire configuration for the fill and cap passes. This welding procedure presents a special post-weld finishing treatment, which consists in flapping the inner and outer weld overfills to produce a flush profile between weld metal and outer/inner pipe surfaces. The experimental approach was focused on quantifying the effect of accumulated plastic deformation using two different reeling frames simulating the same laying vessel: the Technip’s Apache. In this program, two reeling trials were performed at Heriot Watt University, Edinburgh, U.K., and two other trials at Stress Engineering Services, Houston, U.S.A. Then, the strained specimens were full scale fatigue tested at TenarisTamsa R&D facilities. Those results have been compared with fatigue results obtained on unstrained specimens. Post-tests fractographic investigations were systematically performed on all samples to identify the causes for fatigue initiation. The results were statistically analyzed to determine which standard fatigue design curves best represent the measured S-N fatigue endurance. Finally, the results were also compared with the available literature.

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Holtam, Colum M., i David P. Baxter. "Fatigue Performance of Sour Deepwater Riser Welds: Crack Growth vs. Endurance". W ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-49581.

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Steel catenary risers (SCRs) are increasingly used in deepwater oil and gas developments. SCRs can be subject to low-stress high-cycle fatigue loading, for example from wave and tidal motion, vortex induced vibration (VIV) and operating loads, and corrosive environments (internal and external). When the production fluids are sour, higher fatigue crack growth rates (FCGRs) are expected and therefore shorter overall life compared to performance in air, as a result of the interaction between fatigue crack growth and sulphide stress cracking. Successful design of risers is critically dependent on the availability of appropriate experimental data to quantify the extent to which fatigue lives are reduced and rates of fatigue crack growth are increased. Historically there has been a discrepancy between experimental sour fatigue endurance data and fracture mechanics-based estimates of the corresponding stress-life (S-N) curves. This paper summarises the results of recent sour FCGR tests on C-Mn pipeline steel. Tests were performed under conditions of increasing applied stress intensity factor range (ΔK), on specimens containing shallow initial flaws and at very high stress ratios (R), to obtain data close to threshold. In many cases it is material behaviour at these low values of ΔK that dominate the fatigue life (e.g. VIV loading). The FCGR data are then compared to sour fatigue endurance data, both published and from a TWI Joint Industry Project (JIP). The observed environmental reduction factor (ERF) for endurance tests is compared to that expected from the difference in fatigue crack propagation rates, to examine whether FCGR data might provide an alternative means of predicting ERFs. This paper offers valuable insight into current best practice methods for generating sour FCGR data when qualifying girth welds for sour service, and the relationship between fatigue crack growth and fatigue endurance.

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